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EXB-8205/XL and EXB-8505/XL Integration and Optimization

1. PLL The Exabyte Mini Tabletop Cartridge Tape Subsystem enclosure provides three cooling paths Each path flows around a heat generating area A thermistor controlled fan mounted in the rear of the enclosure draws the air along the paths indicated in Figure 4 5 This design forces the maximum amount of ambient air through the highest heat generating areas and across the exterior side of the metal frame It also prevents most airborne contamination of the tape path by directing airflow through the critical cooling areas and reducing the amount of air through the tape path The enclosure separates the power supply from the tape drive and allows a separate power supply cooling path Figure 4 5 shows the isolated area to the left of the tape deck with its own air flow path The fan draws air through the front vertical and horizontal vents around the power supply area With this design you can customize the air flow to meet the heat requirements of a specific power supply Another possible method of cooling the power supply would be to use an enclosed power supply with its own fan or a small additional fan in this separate area Power Thermistor controlled Fan Location AA Figure 4 5 Air flow in the Mini Tabletop Cartridge Tape Subsystem May 1994 EXB 8205 and EXB 8505 4 7 Standard and XL 4 Hardware Integration Issues 4 3 SCSI Installation Requirements To install the tape drive on a SCSI bus the follo
2. Changing from synchronous data transfer only to either synchronous or asynchronous as desired Implementing data compression support Converting SHOW BLOCK and FIND BLOCK commands to READ POSITION and LOCATE commands Implementing support for space to EOD as desired If you are creating an EXB 8205 or EXB 8205XL driver you need to consider this issue If you are creating an EXB 8505 or EXB 8505XL driver no change is needed 6 4 EXB 8205 and EXB 8505 510505 Standard and XL 6 Software Integration Issues Implementing support for setmarks as desired EXB 8505 and EXB 8505XL only Implementing partitions as desired EXB 8505 and EXB 8505XL only Accommodating different filemark sizes depending on data format Accommodating different EEPROM options Accommodating time to clean LED Accommodating CLN and CLND bits in REQUEST SENSE Accommodating different completion times for the following activities refer to page 6 2 for actual times Power on self test POST Data cartridge load Write access Read access Data cartridge rewind Data cartridge unload Accommodating different completion times for the following activities refer to page 6 2 for actual times Initialization Reposition of tape Restart of drum motion If you are creating an EXB 8205 or EXB 8205XL driver you need to consider this issue If you are creating an EXB 8505 o
3. 23 tracks one 1 KByte 184 KBytes physical block yes 6 tracks 48 KBytes yes 849 tracks 249 gap tracks 600 EOD tracks yes 602 tracks 2 gap tracks 600 EOD tracks yes Assumes a data compression ratio of 2 1 2 6 EXB 8205 and EXB 8505 510505 Standard and XL 2 Introduction to Half High Tape Drives 2 4 Tape Drive Customization May 1994 When a half high tape drive is manufactured a number of default values can be programmed into its electronically erasable programmable read only memory EEPROM These default values called EEPROM options can be used to customize a number of drive features including Power on defaults for SCSI commands These include settings for various fields of the MODE SELECT command such as the Density Code Block Length and Cartridge Type Permanent SCSI command operation features These include options for controlling how INQUIRY MODE SELECT MODE SENSE REQUEST SENSE and other SCSI commands operate Hardware operation options These include options for controlling how the unload button works and how the drive autosizes a tape SCSI configuration options These include options for enabling disconnects from the SCSI bus parity checking and command queuing Some of the available EEPROM options are discussed in this manual An order form listing all of the available EEPROM options is available from your account manager Ord
4. Device Configuration Page Page Code 10h Write Buffer Full Ratio Byte 04 and Read Buffer Empty Ratio Byte 05 these values must be equal Vendor Unique Parameters Page 1 Page Code 20h Motion Threshold Byte 04 Reconnect threshold Non page format Reconnect Threshold Byte 03 of the vendor unique parameters Disconnect Reconnect Page Page Code 02h EXB 8205 and EXB 8505 Standard and XL Buffer Full Ratio Byte 02 and Buffer Empty Ratio Byte 03 these values must be equal 510505 8 Optimizing the Performance of Your Tape Drive 8 3 Effectively Managing Data on the Tape Exabyte half high tape drives provide a number of features that help you manage data on the tape By following the guidelines in this section you can effectively organize the data being written to tape so that capacity is maximized and the data is easier to access This section discusses the following topics Compressing data Using partitions Appending data to a previously written tape Using high speed search Obtaining error information Compressing Data To compress data the tape drive uses the Improved Data Recording Capability IDRC compression algorithm licensed from IBM During data compression the drive uses its Compression Integrity Check feature to make sure that the compressed data can be accurately read from tape When data compression is in effect the tape drive continual
5. Figure 9 1 EXATAPE 8mm Data Cartridges 0 000000 9 4 Figure 9 2 Tape passes during a start stop write operation 9 8 Figure 9 3 Write protect switch on the bottom of an 8mm data cartridge 9 12 Figure 9 4 Do not store a data cartridge on its side When the tape inside the data cartridge is on edge damage can result 9 13 Figure 9 5 Exabyte 8mm Data Cartridge Magazines 9 14 EXB 8205 and EXB 8505 510505 Standard and XL Exabyte Support Table 1 1 How to obtain Exabyte support 46 00 08 4448 eevaee bane Introduction to Half High Tape Drives Table 2 1 A comparison of Exabyte half high and full high tape drives Table 2 2 Maximum capacities of XL and non XL tape drives Table 2 3 Read write compatibility of the Exabyte 8mm data formats and 8mm AS drives 4 0 6 4 5 48 Gat k amp ee eA Ge HR HS SHS Cee oS Table 2 4 Vata format featires f4 444 445 eee e ERE REESE Ge HR ES Product Testing Table 3 1 Exabyte reliability tests 4 54 G44 hed dR HAE REE E SS Table 3 2 Tests performed during DVT 24 9 0644644 ee ee GG eee Hew Table 3 3 Tests performed during the Performance at Stress Conditions test Hardware Integration Issues Table 4 1 Environmental specifications 2 2 2 a Table 4 2 Maximum particulate counts for half high tape drive operation Table 4 3 Shock specifications 4 6 sae as 6S wR REE ORD RG
6. or whether it waits longer to drop the BSY line to accommodate drivers that require the BSY line to be enabled for a longer period of time EXB 8205 and EXB 8505 NORMAL The tape drive manually reconnects sends status and sends the Command Complete message to the initiator This slows the entire transaction time before the tape drive drops the BSY line to about 600 usec FAST enhanced setting The tape drive sends status and the Command Complete message to the initiator using an integrated SCSI chip command This reduces the time required for the tape drive to drop the BSY line to about 5 usec Standard and XL 7 SCSI Integration 7 12 Integration Issues for Enhanced SCSI Performance If you choose to implement the enhanced SCSI bus performance be aware of the following issues when creating new drivers or adapting pre existing drivers On bus time requirements Some pre existing drivers may require longer on bus times than are used with the enhanced SCSI bus performance Changes in message handling With the enhanced SCSI performance initiators can process all standard messages at any time Without the enhanced SCSI performance full message processing is allowed only before the Data or Status phases Disconnects without Save Data Pointers With the enhanced SCSI performance the tape drive does not issue a Save Data Pointers message before disconnecting after completing a data transfer Without the
7. 7 8 EXB 8205 and EXB 8505 510505 Standard and XL 7 SCSI Integration 7 2 Disconnecting from the SCSI Bus The disconnect privilege allows other devices to use the bus while the tape drive performs an operation such as reading data from tape Table 7 5 gives an example of how the tape drive supports the disconnect privilege during a read operation Table 7 5 Example of how the drive supports disconnect during a read Bus Free Before any activity the bus is free Arbitration The initiator takes control of the bus Selection The initiator selects the tape drive The initiator sends the Identify message and indicates that Message Out disconnects are permitted The tape drive switches to the Command Phase The Initiator Command sends the command CDB for example a READ command The tape drive sends the Disconnect message and disconnects Message In from the bus The drive sets its data buffer up for a read operation Arbitration The tape drive takes control of the bus Selection The tape drive reselects the initiator Message In The tape drive sends the Identify message to the initiator Data In The tape drive transfers the data it read to the initiator The tape drive sends Save Data Pointers to cause the initiator to Message In save the address of the data it just transferred The drive then sends the Disconnect message and disconnects from the bus Arbitration The tape drive take
8. Table 4 4 Vibration specifications i646 2845 00 e oe ee eee a Software Integration Issues Table 6 1 Timing considerations for tape drive applications Table 6 2 Converting a full high driver to a half high driver Table 6 3 Adding XL support to a half high driver 0 SCSI Integration Table 7 1 Overview of supported SCSI commands status information and MESSAGES e 5 OSG Mee hes 2 OR ae RPh es BE a ES Table 7 2 Supported SCSI commands 2s ce bee ee a Table 7 3 Supported SCSI command statuses 3 02564 4040845 be ae h4 9 Table 7 4 Supported SCSI messages oss a4 4 HSH eR REEDS De DERG Table 7 5 Example of how the drive supports disconnect during a read OPCTANON ej a bce amp amp Heol CSUR Dee ee Se TERS 4 oe Te SS Table 7 6 EEPROM options for enhanced SCSI bus performance Table 7 7 EEPROM options for customizing the SCSI configuration May 1994 EXB 8205 and EXB 8505 Standard and XL Optimizing the Performance of Your Tape Drive Table 8 1 Host data transfer rates required for streaming data Table 8 2 Summary of motion and reconnect thresholds Table 8 3 Where to set the motion threshold and reconnect threshold Table 8 4 Where you can append new data on a previously written tape Table 8 5 High speed search operations using the SPACE command Selecting and Maintaining Tapes Table 9 1 Compatibility of EXATAPE 8mm Data
9. When the tape inside the data cartridge is on edge damage can result May 1994 EXB 8205 and EXB 8505 9 13 Standard and XL 9 Selecting and Maintaining Tapes Exabyte 8mm Data Cartridge Magazine To make data cartridge storage easier Exabyte provides 8mm data cartridge magazines that hold ten 8mm data cartridges each Data cartridges are held in the proper position on a long edge and are protected from airborne contaminants by a clear plastic cover With the cover in place the magazines can be stacked on top of each other to make the most efficient use of storage space A label for the end of the magazine is included with each 8mm data cartridge magazine Figure 9 5 shows the 8mm magazine with and without the cover Figure 9 5 Exabyte 8mm Data Cartridge Magazines As an added feature Exabyte 8mm Data Cartridge Magazines are designed to fit directly into Exabyte 8mm automated tape libraries If you currently use an Exabyte tape library or plan to use one in the future you can use the magazines both for cartridge storage and for easy loading and unloading of tapes in your library Note Exabyte libraries for full high 8mm tape drives require different magazines than Exabyte libraries for half high 8mm tape drives If you plan to use your magazines in a library check with your account manager to determine the type of magazine you need to match your library EXB 8205 and EXB 8505 510505 Standard and XL May 1994 9 Se
10. demonstrates the role of tape drives The figure portrays the three levels of storage that make up HSM online near online and offline HSM requirements for standalone workstations are shown on the left side of each level while HSM requirements for networked workstations or LANs are shown on the right side of each level The arrows in the figure indicate the migration of data through the storage levels Data stored offline is retrieved through physical inventory management and becomes available as near online storage when the data cartridge is read by the tape drive Data management applications manage the transfer of data across the SCSI bus through the server to the workstation that has requested the data 2 14 EXB 8205 and EXB 8505 510505 Standard and XL 2 Introduction to Half High Tape Drives ata Management Applications Physical Inventory Management Figure 2 7 A hierarchical storage management model May 1994 EXB 8205 and EXB 8505 2 15 Standard and XL 2 Introduction to Half High Tape Drives Online Storage Online storage provides continuous rapid access to data stored on a workstation server or external hard disk However the cost and maintenance of online storage is high When a hard disk holds large amounts of data inactive files contribute to a degradation of its performance and occupy space that could be more efficiently used for active files For a standalone workstation online storage requ
11. try to match or slightly exceed these data transfer rates Table 8 1 Host data transfer rates required for streaming data 8200 262 5 KBytes per second 500 KBytes per second 8200c assuming a 2 1 compression ratio 8500 EXB 8505 and 500 KBytes per second EXB 8505XL only 8500c EXB 8505 and EXB 8505XL only 1 MByte per second assuming a 2 1 compression ratio 8 6 EXB 8205 and EXB 8505 510505 Standard and XL 8 Optimizing the Performance of Your Tape Drive Adjusting the Motion and Reconnect Thresholds Depending on whether your tape drive operates as a start stop or streaming device you may be able to increase the efficiency of data transfers to and from the tape drive s buffer by adjusting the motion threshold or reconnect threshold If your tape drive operates as a start stop device you can reduce the number of times the tape is started and stopped during read and write operations by adjusting the motion threshold If your tape drive operates as a streaming device you can reduce the number of disconnects and reconnects that occur by adjusting the reconnect threshold You adjust these thresholds using the MODE SELECT command see Table 8 3 on page 8 8 or you can request default values for these thresholds as an EEPROM option Table 8 2 summarizes the functions of the motion and reconnect thresholds Table 8 2 Summary of motion and reconnect thresholds May 1994 During start stop ope
12. 03937 inches During a start stop write operation the minimum amount of data that must be in the tape drive s buffer before data in the buffer will be written to tape During a start stop read operation the minimum amount of free space that must be in the tape drive s buffer before more data will be transferred from the tape to the buffer The motion threshold is measured in 4 KByte increments See also reconnect threshold Millisecond Micrometer 0 00003937 inches Microsecond Nanosecond National Safe Transit Association A self contained writable and readable area on a tape The EXB 8505 and EXB 8505XL support up to two partitions on a tape Each partition has a physical and logical beginning PBOP and LBOP and a physical and logical end PEOP and LEOP Physical beginning of partition Physical beginning of tape EXB 8205 and EXB 8505 G 5 Standard and XL Glossary PEOP PEOT POST ready reconnect reconnect threshold SCSI SCSI address SCSI ID status target G 6 Physical end of partition Physical end of tape Power on self test which is the process that occurs when the tape drive performs its initial power on diagnostics The state of the tape drive when it is ready to process commands The function that occurs when the target arbitrates and reconnects to an initiator after a disconnect When a disconnect occurs during a streaming write operation the min
13. 1994 EXB 8205 and EXB 8505 2 1 Standard and XL 2 Introduction to Half High Tape Drives The EXB 8205 and EXB 8505 shown in Figure 2 1 are similar in appearance The only difference is that the EXB 8205 s LEDs are vertical while the EXB 8505 s LEDs are horizontal The EXB 8205XL and EXB 8505XL described in Section 2 2 are identical to the non XL drives except that the XL drives have a raised diamond pattern on the unload button The non XL drives have a smooth unload button with an oval shaped indentation EXB 8505 and EXB 8505XL Horizontal LEDs EXB 8505XL has raised diamond pattern on unload button EXB 8205 and EXB 8205XL Vertical LEDs EXB 8205XL has raised diamond pattern on unload button Figure 2 1 EXB 8505 top and EXB 8205 bottom 2 2 EXB 8205 and EXB 8505 510505 Standard and XL 2 Introduction to Half High Tape Drives 2 1 Exabyte Half High Tape Drives Compared to Full High Tape Drives Table 2 1 is a quick comparison of the half high drives EXB 8205 EXB 8505 and XL drives and the full high drives EXB 8200 EXB 8200SX EXB 8500 and EXB 8500c Table 2 1 A comparison of Exabyte half high and full high tape drives 75X normal 1 0 8500c 8500 MByte and 8200c per formats Half high second 10X normal 5 25 8200 format inches 75X normal 8200c format 10X normal 8200 format 500 KBytes per second 75X normal 1 0 8500c 8500 MByte and 82
14. REWIND command 6 3 7 5 8 14 S safety agency standards 4 20 SCSI bus phases 7 2 to 7 3 cable 4 8 to 4 9 cable connector 4 9 commands 7 4 to 7 6 configuration options 7 13 to 7 14 disconnecting from bus 7 9 EEPROM options 2 7 7 10 to 7 14 offline storage 2 16 ID geng eA eee S f improved performance 7 10 to 7 12 on going reliability testing 3 2 installation 4 8 to 4 13 online storage 2 16 f messages 7 7 to 7 8 operating environment 4 14 oveiview FIto7ii operation 8 1 to 8 20 stat s 76 ORT 3 2 termination of bus 4 9 to 4 11 l 2 EXB 8205 and EXB 8505 510505 Standard and XL SCSI ID jumper block 4 12 to 4 13 searching high speed 8 16 to 8 17 SEND DIAGNOSTIC command 7 5 sense key 8 18 shock specifications 4 16 Small Computer System Interface See SCSI SPACE command 7 5 8 14 8 16 start stop operation 8 5 to 8 8 status SCSI 7 6 streaming operation 8 5 to 8 8 support technical 1 1 to 1 4 T tapes See data cartridges technical support 1 1 to 1 4 temperature requirements 4 14 termination SCSI 4 9 to 4 11 TEST UNIT READY command 7 6 testing 3 1 to 3 6 timing issues 6 2 to 6 3 V VERIFY command 7 6 vibration specifications 4 17 W WRITE BUFFER command 7 6 WRITE command 6 2 7 6 8 13 WRITE FILEMARKS command 7 6 write protect switch 9 12 X XL tape drives adding support for 6 6 appearance 2 2 capacity 2 4 description 2 4 media compatibility 9 5 May 1994 EXB 8205 and EXB 8505 Standard and
15. Standard and XL 4 Hardware Integration Issues 4 1 Tape Drive Mounting Requirements A half high tape drive can be installed in almost any location either horizontally or vertically and in a stationary or sliding position These drives are designed to be mounted in the standard 5 25 inch half high form factor If necessary a tape drive can be installed in a larger form factor with a mounting frame not supplied by Exabyte The half high tape drive provides three sets of mounting holes two sets on the sides sets A and B and one set on the bottom set C Figure 4 1 and Figure 4 2 show the locations of the mounting holes Figure 4 2 Mounting holes on the bottom of the half high tape drive 4 2 EXB 8205 and EXB 8505 510505 Standard and XL 4 Hardware Integration Issues Guidelines for Installing the Half High Tape Drive When you install a half high tape drive in an enclosure follow these guidelines The mounting location must meet the environmental requirements discussed in this chapter These requirements specify limits for operating temperature humidity airflow particulate contamination shock and vibration The tape drive must be mounted solidly and securely To assure reliability there must be no distortion of the tape drive s metal housing Do not install the drive in such a way that its frame is unsupported For example do not hang the drive by an edge You must use at least four mounting holes
16. Tape e ik a pug chee ee eee eee we eS 9 3 Why EXATAPE 8mm Data Cartridges 2 20 20 02 0020000 9 3 Compatibility of EXATAPE 8mm Data Cartridges 0 9 5 Conditioning Non EXATAPE Data Cartridges 0 9 6 9 2 Maximizing Tape Life by Minimizing Tape Passes 9 7 Estimating the Number of Tape Passes os acc 4244 ee 4 Sa ewma 4 9 8 9 3 Storing and Maintaining Archived Tapes 2 166 64 ce eee ee ae een 9 9 Establishing and Maintaining a Suitable Environment 9 9 Labeling the Data Cartridges and Maintaining a Storage Log 9 11 Using the Write Protect Switch ss cance eos ee eRe Ree aH Re aR eS 9 12 Storing Data Cartridges Immediately lt 4 4 s s k dae Go eke eS ee 9 13 Storing Data Cartridges in the Proper Position 24 2 ee seae ee ws 9 13 Replacing Data Cartridges 2i082 4 Se ee Pew eee tween eee BS 9 15 Glossary G 1 Index l 1 May 1994 EXB 8205 and EXB 8505 vii Standard and XL Introduction to Half High Tape Drives Figure 2 1 EXB 8505 top and EXB 8205 bottom 0 00 2 2 Figure 2 2 Half high tape drive ina single host environment 2 8 Figure 2 3 Half high tape drive in a multiple device environment 2 9 Figure 2 4 Half high tape drive in a multiple SCSI bus environment 2 10 Figure 2 5 Half high tape drive in a multiple host multiple device environment 2 11 Figure 2 6 Exabyte s PC and workstation network sho
17. XL Index Index Notes l 4 EXB 8205 and EXB 8505 510505 Standard and XL Reader s Comment Form EXB 8205 and EXB 8505 8mm Cartridge Tape Subsystems Integration and Optimization for Standard and eXtended Length XL Configurations Part Number 510505 002 Exabyte welcomes your comments and suggestions about this manual To let us know how we might make our documentation more helpful please complete and mail this form Rate the following on a scale of 1 to 5 1 very poor 5 outstanding Is the information specific enough Is the format easy to follow Is the information clear and accurate Are the drawings clear and accurate Comments Please provide the following information Today s Date Company Name Your Title
18. Your Tape Drive If you plan to create or modify a driver program for a half high tape drive you must consider how the drive interacts with the data being transferred to and from the host By keeping a few tips in mind you can maximize the amount of data that can be stored on each data cartridge and provide for ease of access to that data This chapter provides guidelines and tips for creating drivers that meet these goals including m Optimizing the size of data blocks from the host Fine tuning data transfers Effectively managing data on the tape May 1994 EXB 8205 and EXB 8505 8 1 Standard and XL 8 Optimizing the Performance of Your Tape Drive 8 1 Optimizing the Size of Data Blocks from the Host 8 2 You may want to adjust the block size of the data being transferred from the host to the tape drive to use the maximum capacity of the data cartridge If you are writing data to tape in 8200 format block size optimization is particularly important If you are writing data in 8200c 8500 or 8500c format block size optimization is not as crucial but you can achieve somewhat greater capacity by using larger rather than smaller logical block sizes Each tape drive accepts logical blocks of data from 0 to 240 KBytes in size The optimum size for a logical block transferred from the host is determined by how the drive records the data block to tape Each tape drive records data to tape in physical blocks These physical
19. a LOCATE command RECEIVE DIAGNOSTIC RESULTS Reports the results of diagnostic tests or traces of SCSI and servo command activity to the initiator RELEASE UNIT Releases the tape drive from exclusive use by the initiator that had previously reserved it with a RESERVE UNIT command REQUEST SENSE Provides the initiator with sense information describing a condition that just occurred RESERVE UNIT Reserves the tape drive for exclusive use by the initiator that issued the command REWIND Rewinds the tape to the logical beginning of the tape LBOT or the logical beginning of the current partition SEND DIAGNOSTIC Performs diagnostic functions specified by the initiator For the initiator to receive the results of the tests this command must be followed by a RECEIVE DIAGNOSTIC RESULTS command May 1994 Searches forward or backward on the tape a specified number of logical blocks filemarks or setmarks 8500c format only For tapes written in 8200c 8500 or 8500c format the tape drive can also space to the end of data EOD EXB 8205 and EXB 8505 7 5 Standard and XL 7 SCSI Integration TEST UNIT READY Indicates whether the tape drive is ready to accept a medium access command such as READ or WRITE from the initiator VERIFY Verifies the type or length of one or more logical blocks of data on the tape Accepts data from the initiator to be written to the
20. and EXB 8505 use data cartridges that can be stored individually or in data cartridge magazines that hold up to ten cartridges each 2 16 EXB 8205 and EXB 8505 510505 Standard and XL 2 Introduction to Half High Tape Drives Cost Versus Speed of Retrieval As shown in Figure 2 8 there is a relationship between the cost of data storage and the speed of retrieval in an HSM system Online storage options such as local hard disks provide rapid data access but are very expensive for large amounts of data Offline storage options such as data cartridges stored offsite result in slower retrieval but are much more economical for large amounts of data high cost fast retrieval Online Storage Cost Near Online Storage Offline Storage low cost slowretrieval Speed of Retrieval Figure 2 8 The relationship between cost and the speed of retrieval An effective hierarchical storage management strategy provides economical benefits to offset the inconvenience of some data not being immediately available As demonstrated in Figure 2 7 on page 2 15 effective near online and offline storage options include tape drives Tape media offers a significant economic advantage over disk storage systems for near online storage The addition of automated tape libraries that can manage large inventories of data cartridges offers a solution for networks at significantly less cost than a storage system providing only online storage In addit
21. been revised Information about how to obtain an up to date list of software that supports the half high tape drives has been added Guidelines for adding XL support to an existing half high driver program have been provided Times for various tape drive activities that must be accounted for in a driver program have been added Compatibility information for all EXATAPE 8mm Data Cartridges has been added EXB 8205 and EXB 8505 510505 Standard and XL Contents Welcome xi 1 Exabyte Support 1 1 2 Introduction to Half High Tape Drives 2 1 2 1 Exabyte Half High Tape Drives Compared to Full High Tape Drives 2 3 2 2 The EXB 8205XL and EXB 8505XL aaaea a a a 2 4 2 3 Data Format Features aaa a a 2 5 2 4 Tape Drive C stomizatioh o s s 2a2 a toes p S n ia a a eee e a 2 7 Ordering EEPROM ODHONS sa css 2465 surpi eee REE PE RR a 2 7 2 5 Sample Configurations s ere evi bee ket ee heen iv teeds eer 2 8 Single Host witha Tape Drive ss s ss seen oe Cas eae RRR EDS SS 2 8 Single Host with a Tape Drive and Additional Devices 2 9 Single Host with a Tape Drive and Additional Devices on Multiple SCSI Buses 0 ee 2 10 Multiple Host LAN with a Tape Drive and Additional Devices 2 11 2 6 Tape Drives in Changing and Expanding Configurations an Example 2 12 2 7 Tape Drives and Hierarchical Storage Management 2 14 3 Product Testing 3 1 Col Types OF Testga erara peck ie PEREE SR REDE O
22. better to keep the tape storage location at the levels described in this section rather than changing them to match the operating environment May 1994 EXB 8205 and EXB 8505 9 9 Standard and XL 9 Selecting and Maintaining Tapes 9 10 Temperature and Humidity Temperature and humidity must be maintained at a constant level to reduce stress on the tapes Table 9 3 lists the recommended temperature and humidity range for data cartridge storage Table 9 3 Recommended temperature and humidity for data cartridge storage Ambient 5 C to 32 C temperature 41 F to 90 F Relative 20 to 60 humidity non condensing Note Acceptable range does not mean that the temperature and humidity may fluctuate within this range only that a steady temperature and humidity within this range must be maintained Particulate Contamination The data cartridge storage location must be as free of airborne debris as possible Particulate contamination in data cartridges can prevent error free read back of data from the tape In addition debris may be transferred to the tape drive causing damage to the heads and other parts of the tape path To eliminate obvious sources of particulate contamination follow these basic rules Do not permit anyone to smoke eat or drink near the data cartridge storage area Do not store data cartridges near a copier or printer paper and toner dust can quickly contaminate the tapes EX
23. blocks do not vary in size They consist of a fixed amount of data from the host along with header information cyclic redundancy check CRC information and error correction code ECC added by the drive 1 physical block 14 bytes of header information 1 024 bytes of data from the host 2 bytes of CRC information 400 bytes of ECC 1 440 bytes total EXB 8205 and EXB 8505 510505 Standard and XL May 1994 8 Optimizing the Performance of Your Tape Drive Optimizing Block Size 8200 Format If a logical block of host data in 8200 format does not fill the available space in a physical block the tape drive pads the physical block with gap bytes consisting of null data If a logical block of host data exceeds the amount of available space in a physical block the drive splits the logical block among two or more physical blocks and pads the final physical block with gap bytes if necessary Because gap bytes reduce the capacity of the tape it is important to match the logical block size to the amount of data that the drive can record in each physical block The maximum amount of data that can be recorded in a single physical block of 8200 format data is 1 024 bytes Only one or part of one logical block is recorded in each physical block Thus the optimum logical block size for data from the host is 1 024 bytes or exact multiples of 1 024 Any other logical block size reduces the capacity of the tape Example If the logical bl
24. enhanced SCSI performance the tape drive sends a Save Data Pointers message when disconnecting even after completing a data transfer Disconnects on information commands With the enhanced SCSI performance the tape drive disconnects after receiving the CDB of all commands including information commands Without the enhanced SCSI performance the tape drive disconnects only after receiving tape motion commands MODE SELECT data transfers With the enhanced SCSI performance the tape drive accepts all MODE SELECT data before checking for illegal values Without the enhanced SCSI performance the tape drive interrupts data transfer immediately after receiving an illegal value Front panel LED SCSI activity indications With the enhanced SCSI performance the SCSI status LED is turned on before reselection rather than after so the LED may be lit even though the tape drive is inactive on the bus for example while attempting to reselect This means that multiple tape drives on a SCSI bus can have their SCSI status LEDs lit at the same time For detailed information about these integration issues request the following white paper from Exabyte Technical Support or your account manager WP9302A Optimizing SCSI On Bus Operations New SCSI Interface Microcode for 8mm Cartridge Tape Subsystems Exabyte Corporation February 1993 EXB 8205 and EXB 8505 510505 Standard and XL 7 SCSI Integration 7 4 Other SCSI Configuration Options
25. formats supported by the drive Power Dissipation Measures the current drawn by the tape drive on the 5V 12V power supply lines during various operations including power up tape load tape unload read write high speed search and rewind Write Read Access Times Verifies the write and read access times of the tape drive in all of its supported data formats Access time is the time that elapses after the drive receives the last byte of the command CDB until it signals REQ to transfer the first byte of data across the SCSI bus Power Supply Noise Injection Verifies that the tape drive will accurately read and write data when certain levels of noise are injected on its power supply lines Tape Drive Functionality Performance at Stress Conditions See Section 3 3 Mixed Model Data Interchange May 1994 Verifies that the tape drive is able to write tapes that are readable by other compatible Exabyte products and read tapes that are written by other compatible Exabyte products EXB 8205 and EXB 8505 Standard and XL 3 Product Testing Status Verifies that the LEDs on the front panel of the tape drive accurately Indicators indicate the following states power on initialization power on self test pass or fail ready with tape loaded SCSI activity error normal tape motion compressed tape motion time to clean ironmental Specifications Electrostatic Verifies that the
26. logical block can start in one physical block and end in another physical block For example if a logical block from the host is 3 000 bytes the tape drive places 1 024 bytes in the first physical block 1 024 bytes in the second physical block and 952 bytes in the third physical block The next 3 000 byte logical block from the host starts immediately following the 952 bytes in the third physical block Because no gap bytes are added to physical blocks tape capacity is not significantly affected by the size of physical block sent by the host Although logical block packing prevents the loss of significant tape capacity slight capacity may be lost when small block sizes are used When packing more than two logical blocks in a single physical block the tape drive adds a two byte header to each logical block after the second block Example In an extreme case suppose that the host is sending a series of one byte logical blocks to the drive Tape capacity is used as follows The tape drive places the first two one byte data blocks in the 1 024 byte physical block No header information is added to these blocks This consumes two bytes of space in the physical block The drive then places the next 340 one byte logical blocks into the physical block adding two bytes of header information to each of the logical blocks Therefore these 340 one byte data blocks consume 1 020 bytes of space in the physical block The drive adds two gap bytes
27. meters 82 02 feet A stub length of no more than 0 2 meters 8 inches is allowed off the mainline interconnection within any connected equipment The stub length within the tape drive is less than 50 mm 1 97 inches EXB 8205 and EXB 8505 510505 Standard and XL May 1994 4 Hardware Integration Issues Cable Length Requirements for Single Ended Configurations For single ended SCSI configurations ensure that the sum of all the SCSI cable lengths does not exceed 6 0 meters 19 68 feet A stub length of no more than 0 1 meters 4 inches is allowed off the mainline interconnection within any connected equipment The stub length within the tape drive is less than 50 mm 1 97 inches SCSI Cable Connector The tape drive s SCSI connector is located at the rear of the drive The connector is a 50 pin male ribbon cable connector consisting of two rows of 25 pins with adjacent pins 2 54 mm 0 1 inch apart To connect the tape drive to the SCSI bus use a 50 pin female ribbon cable connector AMP No 1 746285 0 or equivalent SCSI Bus Terminator The SCSI bus that you attach the tape drive to must be terminated correctly to ensure proper operation The devices that are physically located at each end of the SCSI cable must have terminators installed All other devices on the SCSI cable must not have terminators installed If the tape drive will be located at the end of the SCSI bus you must terminate the drive The procedu
28. of partition LBOT Logical beginning of tape LBOP Logical beginning of partition LEOT Logical end of tape LEOP Logical end of partition PEOT Physcal end of tape PEOP Physical end of partition am Figure 8 1 Corresponding areas on an unpartitioned tape and a dual partition tape 8 12 EXB 8205 and EXB 8505 510505 Standard and XL May 1994 8 Optimizing the Performance of Your Tape Drive The following are brief summaries of operations you typically perform with partitions For specific details about these operations refer to the EXB 8205 and EXB 8505 SCSI Reference Creating Partitions To create a partitioned tape format the tape using the MODE SELECT command The MODE SELECT command lets you specify how many partitions will be on the tape one or two and what size the first partition will be the size of the second partition is always the remainder of the tape Loading a Partitioned Tape You load a dual partition tape exactly as you would a standard tape However you can use the MODE SELECT command to choose which partition the tape drive positions the tape to immediately after it is loaded By default the drive positions the tape to the second partition The second partition is typically used as the data area while the first partition is used as the directory for the tape Because the drive positions the tape to the second partition by default you can easily append data in the data area then move back to the fi
29. option allows you to choose whether the default data format is 8200 or 8200c To specify a data format other than the default issue a MODE SELECT command If you are appending data to a previously written tape the tape drive automatically determines the tape format for you and writes in that format When the tape drive is writing data in 8200c format the data is always compressed You cannot turn compression on and off EXB 8205 and EXB 8505 510505 Standard and XL May 1994 8 Optimizing the Performance of Your Tape Drive Using the EXB 8505 or EXB 8505XL to Write Compressed Data The EXB 8505 and EXB 8505XL write data in four different formats two of which are compressed 8200c and 8500c 8500c format is the default data format for the EXB 8505 and EXB 8505XL When writing data with one of these drives keep the following rules in mind The EXB 8505 and EXB 8505XL allow only one format on any one tape You must write the tape entirely in 8200c format 8200 format 8500c format or 8500 format When writing to a new tape you must specify the tape s format at the logical beginning of tape LBOT If you do not specify a format the tape drive writes in its power on default format The default format for the EXB 8505 and EXB 8505XL is typically 8500c However an EEPROM option allows you to choose whether the default data format is 8200 8200c 8500 or 8500c To specify a data format other than the default issue a MODE
30. product are pulled from inventory and subjected to long term performance tests that determine the life of such components as the motors recording heads and electronics Standard and XL 510505 3 Product Testing 3 2 DVT Tests Design verification testing DVT consists of a wide range of tests designed to verify the product s functionality The individual tests performed on tape drives are described in Table 3 2 Following the table Section 3 3 describes the most critical of these tests the Performance at Stress Conditions test Table 3 2 Tests performed during DVT SCSI Specification Compliance SCSI Command Set Verifies that the SCSI command set implemented in the tape drive complies with ANSI specifications SCSI Message Set Verifies that the SCSI message set implemented in the tape drive complies with ANSI specifications Unit Attention and Reset Conditions Verifies that the tape drive reports Unit Attention after the conditions specified in the EXB 8205 and EXB 8505 Product Specification or the EXB 8205 and EXB 8505 SCSI Reference and that the drive can be reset under the conditions specified in the Product Specification or SCSI Reference Performance Specifications Transfer Rate Benchmark Verifies the data transfer rate of the tape drive including synchronous and asynchronous data transfers fixed block and variable block transfers and transfers in all of the data
31. start stop activity see the explanation of start stop and streaming activity in Section 8 2 starting on page 8 5 Figure 9 2 on the following page demonstrates tape movement during a start stop write operation As shown in the figure each start stop event results in three passes over a portion of the tape 1 The tape drive writes all of the data in its buffer to the tape When the buffer is empty the tape drive writes gap blocks and tracks to provide a gap area that aids in tape repositioning for the next write operation pass 1 2 The drive stops tape motion while the buffer refills to the motion threshold During this time the drive repositions the tape so that the write head is at the proper location for appending data To do this the drive first moves the tape backward a certain distance pass 2 3 When the motion threshold is exceeded the drive finishes repositioning the tape by moving the tape forward This allows the tape to come up to speed and matches the position of the write head to the location of the last gap track pass 3 Data is then appended immediately following the last gap track In contrast during a streaming write operation only one tape pass occurs over any particular area of the tape This is because the tape drive never has to stop tape motion and reposition to accommodate a slow data transfer rate EXB 8205 and EXB 8505 9 7 Standard and XL 9 Selecting and Maintaining Tapes 1 The drive wr
32. storage capability As an integrator you may find that it is nearly impossible to evaluate all of the available data grade tapes Besides being time consuming it is very difficult to obtain a representative sampling of any one type of tape due to the variations inherent in the manufacturing process Because of the difficulty in evaluating the factors that make a tape appropriate for data storage Exabyte continually tests tape technologies to determine the best formulation for use with Exabyte tape drives In 1992 Exabyte introduced a new tape formulation that optimizes tape drive performance the EXATAPE 8mm Data Cartridge This data cartridge is the only cartridge recommended for use with the EXB 8205 EXB 8505 and XL tape drives Why EXATAPE 8mm Data Cartridges The EXATAPE 8mm Data Cartridge offers the highest performance available for 8mm tape drives for the following reasons EXATAPE specifications are optimized for use in Exabyte products EXATAPE cartridges are the only data cartridges used in the design testing and manufacturing of all Exabyte products The tape formulation is optimized for use with Exabyte s recording technology and the physical characteristics of the cartridge are optimized for the shape and handling methods of Exabyte tape drives a EXATAPE quality is continually monitored and qualified in Exabyte tape drives Variability in the manufacturing process is eliminated and consistency in magnetic
33. tape WRITE BUFFER Transfers new microcode from the initiator into the tape drive s control memory This command is used in conjunction with the READ BUFFER command to copy one drive s microcode to another drive WRITE FILEMARKS Writes a specified type and number of filemarks or setmarks 8500c format only to the tape SCSI Command Status After every command operation performed the tape drive sends one status byte to the initiator to indicate whether the command was performed successfully or an abnormal condition occurred Table 7 3 describes the statuses supported by the tape drive Table 7 3 Supported SCSI command statuses Good Indicates that the tape drive successfully completed the command No additional action is required Check Condition Indicates an error exception or abnormal condition occurred Issue a REQUEST SENSE command Busy Indicates that the tape drive is busy and cannot complete the command at this time Reissue the command Reservation Conflict 7 6 Indicates that the tape drive is reserved for the exclusive use of another initiator EXB 8205 and EXB 8505 Standard and XL Have the reserving initiator issue a RELEASE UNIT command or reset the bus 510505 7 SCSI Integration SCSI Messages The SCSI message system assists in the management of the physical path between the initiator and the tape drive This include
34. tape drive will operate normally Table 4 3 Shock specifications 3 g for 5 ms 45 g at a velocity change of NSTA Project 1A 192 inch sec4 a The tape drive has not been unpacked gt The tape drive has been unpacked but no power has been applied A minimum of 20 shock pulses were applied to each of the three orthogonal axes The shock pulses were half sine waves and were applied at a rate not exceeding one shock per second d A minimum of three trapezoidal shock pulses of 45 g were applied to each of the tape drive s six sides at a velocity change of 192 inches per second equivalent height equals 48 inches EXB 8205 and EXB 8505 510505 Standard and XL 4 Hardware Integration Issues Vibration Table 4 4 lists the vibration specifications for the half high tape drive during operation non operation storage and transportation The operating specifications listed in this table indicate the amount of vibration that the drive can withstand while reading and writing data Table 4 4 Vibration specifications 1 Hz PSD 0 000003 g Hz 5 Hz PSD 0 00002 g7 Hz 10 Hz PSD 0 0003 g Hz 200 400 Hz PSD 0 00008 g Hz PSD 0 0003 g Hz PSD 0 00055 g Hz PSD 0 01 g Hz PSD 0 01 g Hz PSD 0 000003 g Hz NSTA Project 1A a A 0 30 g RMS random vibration spectrum is applied to each of three orthogonal axes for a minimum of 20 minutes per axis DA 1 0 g RMS random vibration spectru
35. tape motion commands write data to the tape and read the data to gather error statistics Do this from the beginning of the tape to the end of the tape in streaming mode for at least four full passes two writes and two reads Check the error statistics and inspect the data cartridge m Analyze the error statistics Set an error threshold that is suitable for your needs If the errors are higher than this threshold discard the cartridge a Visually inspect the tape on the tape reel through the window If you see staggered wraps discard the cartridge a Examine the outside of the data cartridge for physical damage If you see any damage discard the data cartridge EXB 8205 and EXB 8505 510505 Standard and XL 9 Selecting and Maintaining Tapes 9 2 Maximizing Tape Life by Minimizing Tape Passes May 1994 Whether a backup strategy involves just one tape or a number of tapes in a rotation scheme reliability and economy are always important goals These goals are best achieved by obtaining the maximum life from each tape One of the keys to maximizing tape life is to implement a backup application that minimizes unnecessary tape passes A tape pass is defined as one pass of a particular area of tape over the heads under tension EXATAPE 8mm Data Cartridges are designed to withstand approximately 1 500 tape passes when stored and handled as recommended Applications that cause the fewest tape passes are those that minimize
36. to complete the 1 024 byte physical block Because of the extremely small logical block size tape capacity is reduced by approximately two thirds 342 bytes of user data stored in each physical block out of 1 024 bytes available EXB 8205 and EXB 8505 510505 Standard and XL 8 Optimizing the Performance of Your Tape Drive 8 2 Fine Tuning Data Transfers May 1994 Each half high 8mm tape drive contains a 1 MByte data buffer that enables it to operate as either a streaming device or a start stop device depending on the rate of data transfer to and from the host system If your system permits operating the drive in streaming mode can maximize the amount of data you can store on a tape and minimize the amount of wear on the tape and recording heads Streaming Mode When the tape drive is operating in streaming mode it transfers data continuously between the buffer and tape without stopping tape motion During a streaming write operation if the tape drive s buffer fills with data from the host faster than the drive can write the data to tape the drive disconnects from the SCSI bus The drive continues to write data to tape until the buffer has emptied to a certain level the reconnect threshold Then the drive reconnects to the SCSI bus to accept more data During a streaming read operation if the host can accept data from the tape drive s buffer faster than the drive can fill the buffer with data from the tape the dr
37. to the desired position When the red switch is fully visible that is the opening at the bottom of the data cartridge is covered the data cartridge is write protected and cannot be written to or erased Conversely when the red switch is not visible the opening is not covered the data cartridge is write enabled and can be written to or erased Write protected m Figure 9 3 Write protect switch on the bottom of an 8mm data cartridge Write enabled 9 12 EXB 8205 and EXB 8505 510505 Standard and XL 9 Selecting and Maintaining Tapes Storing Data Cartridges Immediately Store data cartridges as soon as possible after you have archived data to them Immediate storage helps avoid many of the conditions that can damage tapes such as temperature and humidity fluctuations particulate contamination and excessive handling Storing Data Cartridges in the Proper Position A data cartridge must be stored on one of its long edges not flat on its side As shown in Figure 9 4 when a data cartridge is stored on its side the tape inside the data cartridge is actually on its edge When the tape is on its edge stress builds up along the edges Damage to the edges can result leading to the shedding of debris For the same reason never stack data cartridges on top of each other or lean them at an angle for extended periods of time RIGHT Figure 9 4 Do not store a data cartridge on its side
38. 00c per formats second 10X normal 8200 format Full high 5 25 500 75X normal inches KBytes 8500 format per 10X normal second 8200 format 246 75X normal KBytes per second 10X normal These figures represent the maximum sustained data transfer rate These figures assume a 2 1 data compression ratio May 1994 EXB 8205 and EXB 8505 2 3 Standard and XL 2 Introduction to Half High Tape Drives 2 2 The EXB 8205XL and EXB 8505XL The eXtended Length XL configurations of the EXB 8205 and EXB 8505 the EXB 8205XL and EXB 8505XL provide extra data capacity by supporting the extended length EXATAPE 160m XL 8mm Data Cartridge The XL tape drives are fully compatible with the non XL tape drives each XL drive supports all of the tape sizes and data formats supported by the corresponding non XL drive Important EXATAPE 160m XL 8mm Data Cartridges are intended for use in the EXB 8205XL and EXB 8505XL only The EXB 8205 and EXB 8505 do not support 160m data cartridges See page 9 5 for detailed information about using the 160m XL data cartridge Table 2 2 compares the capacities of the XL tape drives and non XL tape drives on the longest tape size supported by each Table 2 2 Maximum capacities of XL and non XL tape drives 2 5 GBytes 5 0 GBytes 3 5 GBytes 7 0 GBytes 2 5 GBytes 5 0 GBytes 5 0 GBytes 10 0 GBytes 3 5 GBytes 7 0 GBytes 7 0 GBytes 14 0
39. 1685 38th Street Boulder Colorado 80301 303 442 4333 510505 002 EXB 8205 and EXB 8505 510505 Standard and XL Product Warranty Caution The EXB 8205 EXB 8205XL EXB 8505 and EXB 8505XL 8mm Cartridge Tape Subsystems tape drives are warranted to be free from defects in materials parts and workmanship and will conform to the current product specifications upon delivery For the specific details of your warranty refer to your sales contract or contact the company from which the tape drive was purchased The warranty for the tape drive shall not apply to failures caused by a Physical abuse or use not consistent with the operating instructions or product specifications provided by Exabyte s personnel or agent for the applicable equipment a Use of any type of cleaning material other than an Exabyte 8mm Cleaning Cartridge or an Exabyte approved cleaning cartridge a Modifications by other than Exabyte s personnel or agent in any way other than those approved by Exabyte provided the warranty shall not be voided by the repair or replacement of parts or the attachment of items in the manner described in maintenance or installation instructions provided by Exabyte a Repair by other than Exabyte s personnel or agent in a manner contrary to the maintenance instructions provided by Exabyte a Removal of the Exabyte serial number tag a Physical abuse due to improper packaging of returns CAUTION Returning the t
40. B 8205 and EXB 8505 510505 Standard and XL May 1994 9 Selecting and Maintaining Tapes Labeling the Data Cartridges and Maintaining a Storage Log Numerous strategies exist for backing up files individual devices and networks Whatever backup strategy you use labeling and logging are the key to being able to retrieve information from the tape You need a system that allows you to determine the location of individual files on tapes Some suggestions for information to record on the data cartridge label include Data cartridge number log number Date backup was performed Format of the data on the tape 8500 8500c 8200 or 8200c Some suggestions for information to record in the storage log include Data cartridge number log number Date backup was performed Format of the data on the tape 8500 8500c 8200 or 8200c Location in a data cartridge magazine for example Contents what files are on the tape History of the tape s use Model and serial number of the drive the tape was recorded on Error statistics EXB 8205 and EXB 8505 9 11 Standard and XL 9 Selecting and Maintaining Tapes Using the Write Protect Switch An 8mm data cartridge is equipped with a write protect switch to prevent unintentional overwriting of data on the tape Figure 9 3 shows the location of the write protect switch To set the write protect switch use a ballpoint pen or other suitable instrument to move the red switch
41. Cartridges and Exabyte 8mm tape dives solinsa eee AOS s EOS eG oO ee Bee ea Table 9 2 Number of tape passes associated with various types of tape activity Table 9 3 Recommended temperature and humidity for data cartridge storage x EXB 8205 and EXB 8505 Standard and XL 510505 Waalcome May 1994 This manual provides information for integrating the EXABYTE EXB 8205 or EXB 8505 8mm Cartridge Tape Subsystem tape drive into a product line It also provides information for integrating the eXtended Length XL configurations of these tape drives the EXB 8205XL and EXB 8505XL By discussing the specific issues that you need to consider as you evaluate install and design applications for a half high 8mm tape drive this manual helps to ensure that you will achieve positive results during the integration process EXB 8205 and EXB 8505 Standard and XL xi xii To help you through the integration process this manual presents the following information Chapter 1 Exabyte Support describes the types of support available from Exabyte and provides a list of who to contact for specific information Chapter 2 Introduction to Half High Tape Drives summarizes the important features of the EXB 8205 EXB 8505 EXB 8205XL and EXB 8505XL and provides examples of how half high tape drives fit into a variety of configurations It also provides an overview of the principles of hierarchical storage mana
42. DES ER Ed eos amp 4 3 2 3 2 DVT Tests e soe a we eh eS Se Re ep at we Geb ees ew a ee ee e 3 3 3 3 Performance at Stress Conditions Test 0 000000 eee 3 5 3 4 Availability of Test Results o 45 4 24004 e08 oso eSpRe ed Eu Es 3 6 4 Hardware Integration Issues 4 1 4 1 Tape Drive Mounting Requirements 2 455244 dsaur pee ae ee Re aS 4 2 Guidelines for Installing the Half High Tape Drive 4 3 4 2 Half High Tape Drive Enclosures sd o8 24 noe eae Ee OES 4 4 Thermal Considerations for Half High Enclosures 4 6 Cooling Paths in the Mini Tabletop Enclosure 0 ee ee ee een 4 7 4 3 SCSI Installation Requirements 045 lt 5 ee ee bw ce eee ee ew es 4 8 DE SIC ables eee e rae Bees at as at ees es Sea ee ees at te Sw 4 8 SCSI Cable Connector 2 0 ee 4 9 SCSI Bus Terminator es o marg 4 6 24 aer Ah amp wow Hee edi bee aE RO 4 9 4 4 Options for Setting the SCSIID 6 40 24 6646 4 Os 4 6S HEE w EG ees 4 12 Setting est SUID with JUMPErS s ss tena Oe ee ha eee ee eR ee 4 13 Setting the SCSI ID witha Remote Switch 2 6652856 e eae ee ee 4 13 May 1994 EXB 8205 and EXB 8505 Vv Standard and XL 4 5 Environmental Considerations 0 00000 eee eee ee 4 14 Temperature and Humidity se ros ke eke bu oe ye eee Bed 4 14 Air Flow and Particulate Contamination 0 0 000084 4 15 SHOCK 24 oe ey Stes es eet es Se ee gn ee es WR ee 4 16 Vibration eoe is ee obs ee
43. EXB 8205 amp EXB 8505 8mm Tape Drives standard and eXtended Length configurations Integration and Optimization sExabyte 510505 002 Copyright Disclaimer Trademark Notices Revision History Copyright 1994 by Exabyte Corporation All rights reserved This item and the information contained herein are the property of Exabyte Corporation No part of this document may be reproduced transmitted transcribed stored in a retrieval system or translated into any language or computer language in any form or by any means electronic mechanical magnetic optical chemical manual or otherwise without the express written permission of Exabyte Corporation 1685 38th Street Boulder Colorado 80301 Exabyte Corporation makes no representation or warranties with respect to the content of this document and specifically disclaims any implied warranties of merchantability or fitness for any particular purpose Further Exabyte Corporation reserves the right to revise this publication without obligation to notify any person or organization of such revision or changes EXABYTE and EXAPAK are registered trademarks and EXATAPE and Compression Integrity Check are trademarks of Exabyte Corporation All other product names are trademarks or registered trademarks of their respective companies Revisions of this manual include the following Revision Date 000 Preliminary April 1993 001 May 1993 002 May 1994 Exabyte Corporation
44. Exabyte Support The following is a partial list of software vendors that have developed applications that support Exabyte half high tape drives For a comprehensive list of software packages and a compatibility chart contact your Exabyte account manager Arcada Software Banyan Central Point Software Cheyenne Software Corel Corporation Dantz Development Data Visual Diversified I O Emerald Systems Gazelle Systems IBM Legato Systems Microsoft Mountain Network Solutions Novastor Novell Optima Technology Palindrome PCPC Performance Technology Rexon Software SCO Surf City Software Sunsoft Symantec Systems Enhancements Sytron TapeDisk Trantor EXB 8205 and EXB 8505 510505 Standard and XL Introduction to Half High Tape Drives The following is an overview of the important features of the EXB 8205 and EXB 8505 and an introduction to the eXtended Length configurations of these tape drives the EXB 8205XL and EXB 8505XL The features of the EXB 8205 EXB 8505 and XL drives are compared with Exabyte s full high 8mm tape drives the EXB 8200 EXB 8200SX EXB 8500 and EXB 8500c Data format and customization features of the half high tape drives are highlighted and examples of configurations in which these drives provide effective backup are discussed Finally an overview of hierarchical storage management a data storage model in which Exabyte tape drives are highly effective is provided May
45. GBytes Assumes a 2 1 data compression ratio Note You can distinguish an XL tape drive from a non XL tape drive by checking the unload button The XL drives have a raised diamond pattern on the unload button 2 4 EXB 8205 and EXB 8505 510505 Standard and XL 2 Introduction to Half High Tape Drives 2 3 Data Format Features The EXB 8205 and EXB 8205XL write data in two formats 8200 m 8200c compressed The EXB 8505 and EXB 8505XL write data in four formats 8200 8200c compressed 8500 8500c compressed Table 2 3 shows the read write compatibility of these data formats and all Exabyte 8mm tape drives Table 2 3 Read write compatibility of the Exabyte 8mm data formats and 8mm tape drives 8200 format 8200c format 8500 format 8500c format May 1994 EXB 8205 and EXB 8505 2 5 Standard and XL 2 Introduction to Half High Tape Drives Table 2 4 compares the data format features of the half high tape drives Table 2 4 Data format features 262 500 1 0 KBytes sec KBytes sec MByte sec 2 5 5 0 10 0 GBytes GBytes GBytes 3 5 7 0 14 0 GBytes GBytes GBytes Helical scan Two write heads write two overlapping data tracks Track 1 20 azimuth Track 2 10 azimuth Helical scan One write head writes a single data track with a 10 azimuth no yes no yes 270 tracks 6 tracks 2 160 KBytes 48 KBytes
46. Regulations Part 15 Radio Frequency Devices Subpart B Unintentional Radiators Class B m Canadian Department of Communications DOC Radio Interference Regulation Digital Apparatus Class B m VDE0871 6 78 Class B German Postal Regulation Vfg 243 1991 and Vfg 46 1992 4 20 EXB 8205 and EXB 8505 510505 Standard and XL May 1994 4 Hardware Integration Issues Electromagnetic Compatibility EMC IEC 801 2 Second Edition 1991 04 Electromagnetic Compatibility for Industrial Process Measurement and Control Equipment Part 2 Electrostatic Discharge Requirements as follows The tape drive can withstand discharges of e Up to 10 kilovolts kV applied to those points that are accessible during normal use without affecting the permanent read error rate or requiring operator intervention e Up to15kV applied to those points that are accessible during normal use without sustaining permanent damage However at this level of discharge operator intervention may be required to reset the tape drive Note No errors will occur or damage be caused to the drive when a cartridge charged to up to 20 kV is inserted IEC 801 3 First Edition 1984 Electromagnetic Compatibility for Industrial Process Measurement and Control Equipment Part 3 Radiated Electromagnetic Field Requirements as follows The tape drive will continue to operate without error when subjected to electromagnetic energy of severity level 2 3 volts meter E
47. SELECT command When writing data to a dual partition tape you must write in 8500c format When the tape drive is writing data in 8200c format the data is always compressed You cannot turn compression on and off When the tape drive is writing data in 8500c format you can turn compression on and off at any point on the tape by issuing a MODE SELECT command If you are appending data to a previously written tape the tape drive automatically determines the tape format for you and writes in that format EXB 8205 and EXB 8505 8 11 Standard and XL 8 Optimizing the Performance of Your Tape Drive Using Partitions EXB 8505 or EXB 8505XL Writing in 8500c Format Only In 8500c format the EXB 8505 and EXB 8505XL can write and read tapes containing up to two partitions A partition is a self contained writable and readable area on a tape Partitioned tapes provide an efficient way to maintain a directory at the beginning of a tape Figure 8 1 shows the correspondence between the various areas on an unpartitioned tape and on a tape with two partitions The first partition on a dual partition tape is Partition 1 and the second partition is Partition 0 PBOT LBOT EOD LEOT PEOT Dual PartitionTape H Partition 1 4 e Partition 0 AW AAW ae AE 1 ue 0 and T EOD 0 LEOT PEOT and LBOP 1 LEOP 1 and and PBOP 1 EOD 1 PBOP 0 LEOP 0 PEOP 0 PBOT Phystal beginning of tape PBOP Physical beginning
48. Table 7 7 describes several other EEPROM options you can order to customize the SCSI configuration of your half high tape drive Refer to Section 2 4 for information about ordering EEPROM options Table 7 7 EEPROM options for customizing the SCSI configuration Synchronous negotiations Controls how the tape drive responds to the Synchronous Data Transfer Request 01h message and whether the drive initiates synchronous data transfers NORMAL The tape drive accepts Synchronous Data Transfer Request messages but does not initiate synchronous data transfers NONE The tape drive rejects Synchronous Data Transfer Request messages and does not initiate synchronous data transfers INITIATE The tape drive responds normally to synchronous negotiations and initiates synchronous negotiations with every initiator when first selected after a reset SCSI bus parity checking Enables or disables parity checking on the SCSI bus When enabled the tape drive checks every byte received across the SCSI bus for parity ON Parity checking enabled OFF Parity checking disabled No disconnect during data transfer Controls whether the tape drive can disconnect from the SCSI bus during a data transfer DISCONNECTS ALLOWED DISCONNECTS NOT ALLOWED Even byte disconnect Controls whether disconnects will occur on even byte boundaries only or on any byte ON Disconnect on even byte boundaries only 2 by
49. XB 8205 and EXB 8505 4 21 Standard and XL 4 Hardware Integration Issues Notes 4 22 EXB 8205 and EXB 8505 510505 Standard and XL Half High Tape Drive Maintenance May 1994 The most important part of maximizing half high tape drive reliability and tape life is regular cleaning of the drive Operating a tape drive without regular cleaning can lead to increased error rates and ultimately drive failure You should begin cleaning a tape drive regularly as soon as the device is put into use This chapter explains why cleaning is so important and provides guidelines for determining when a tape drive requires cleaning CAUTION Except for cleaning Exabyte tape drives require no user maintenance or adjustments All service or repairs must be performed by Exabyte or authorized service personnel EXB 8205 and EXB 8505 5 1 Standard and XL 5 Half High Tape Drive Maintenance 5 1 What Causes a Tape Drive to Require Cleaning 5 2 Tape drives are rarely operated in perfectly clean temperature controlled humidity controlled environments Although a tape drive does not require perfect environmental conditions its performance can be adversely affected by contaminants such as dust grit and smoke The effects of contaminants are often exacerbated by wide temperature and humidity variations Refer to Chapter 4 for detailed information about optimizing the tape drive s operating environment for maximum performan
50. a message to transmit to the target American Wire Gauge Binary base 2 numbering system Beginning of tape Busy bus condition Initiator or target devices connected to the SCSI bus Eight bits or one character Celsius Centigrade Canadian Department of Communications Centimeter 0 3937 inches The function performed within the tape drive s compression circuit to ensure that compressed data can be accurately read from tape The establishment of communications between the initiator and the selected target Cyclic redundancy check Canadian Standards Association Cartridge Tape Subsystem For example the EXB 8205 and EXB 8505 The termination of communications between the initiator and the target During a disconnect the target releases control of the SCSI bus allowing the bus to become free The logical end of tape LEOT or logical end of partition LEOP Error correction code 510505 Standard and XL ECMA EEPROM EPROM EOD EOP EOT EXATAPE EXB 8200 EXB 8205 EXB 8205XL EXB 8200SX EXB 8500 May 1994 EXB 8205 and EXB 8505 Glossary European Computer Manufacturers Association Electrically erasable programmable read only memory Erasable programmable read only memory End of data End of partition End of tape A data grade rewritable 8mm data cartridge that is recommended for use in all Exabyte 8mm tape drives The EXB 8200 8mm Cartridge Tape Subsystem T
51. abyte 8mm Cleaning Cartridge or an Exabyte approved cleaning cartridge or you will void the warranty for the tape drive and you may damage the drive EXB 8205 and EXB 8505 510505 Standard and XL May 1994 5 Half High Tape Drive Maintenance Procedure for Cleaning a Tape Drive CAUTION To prevent contamination of the tape drive and damage to the heads never rewind and reuse the cleaning cartridge Reusing the material in the cleaning cartridge will redistribute contaminants previously removed from the tape path The cleaning procedure for a tape drive consists of the following steps Apply power to the tape drive When the power on self test is complete press the unload button and remove any data cartridge from the drive Insert the cleaning cartridge into the tape drive The tape drive automatically recognizes the presence of a cleaning cartridge and performs a cleaning cycle which lasts from 2 to 3 minutes When the cleaning cycle is complete the cleaning cartridge is automatically unloaded and ejected Important If there are no more cleaning cycles remaining for the cleaning cartridge the drive ejects it without performing a cleaning cycle The top and bottom LEDs remain lit Discard the cleaning cartridge when no more cleaning cycles remain To confirm that a cleaning was done check the LEDs on the front panel If the cleaning cycle was successful the top and bottom LEDs will be off If the clean
52. al horizontal front and back views of the Mini Tabletop Cartridge Tape Subsystem Figure 4 3 Exabyte s Mini Tabletop Cartridge Tape Subsystems with the EXB 8505 installed 4 4 EXB 8205 and EXB 8505 510505 Standard and XL May 1994 4 Hardware Integration Issues The Mini Tabletop Cartridge Tape Subsystem offers these features Configuration flexibility Lightweight completely enclosed temperature controlled design allows either vertical or horizontal placement Power protection Internal self switching universal power supply allows continuous operation during limited power interruptions or surges An AC line filter minimizes interference Temperature control Thermistor variable speed fan with locked rotor protection and polarity protector maintains internal temperature with minimal noise Superior reliability Maximum EMI RFI shielding in a fully enclosed container meets the most stringent regulatory and safety agency standards Advanced interface Remote SCSI ID switch and two SCSI connectors provide multiple options in a daisy chained environment Safety and regulatory agency approval You do not need to re certify the tape drive in the Mini Tabletop enclosure For more information about the Mini Tabletop Cartridge Tape Subsystem refer to the Mini Tabletop 8mm Cartridge Tape Subsystem Product Specification EXB 8205 and EXB 8505 4 5 Standard and XL 4 Hardwar
53. al Chassis Grounding The rear panel of the half high tape drive includes a grounding hole and ground tab as shown in Figure 4 10 If desired you can use either the grounding hole or ground tab to provide additional chassis grounding as follows Connect a inch female spade connector to the ground tab m Connect an M3 0 5 x 6 mm self tapping screw to the grounding hole Note The power supply returns are connected to the chassis so you cannot isolate logic common ground from chassis ground EXB 8205 and EXB 8505 510505 Standard and XL May 1994 4 Hardware Integration Issues Ground Grounding Tab Hole 300QQU ee o _ Power Connector Figure 4 10 Location of the ground tab grounding hole and power connector on the back of the tape drive Power Cable and Connector CAUTION The tape drive does not provide any overvoltage or overcurrent protection For this reason be sure that the power is off before connecting the drive to a power supply The power connector used in the half high tape drive is compatible with power connectors used for standard 5 25 inch half high devices The location of the power connector is shown in Figure 4 10 To connect the drive to a power cable use an AMP 1 480424 0 series or equivalent female connector CAUTION The power cable plug and t
54. aming mode Note that during the 3 1 msec the drive does not remain connected to the SCSI bus Read access 6 2 Read access time starts when the tape drive receives the last byte of the READ command when the initiator de asserts ACK and ends when the drive asserts REQ to indicate that it is ready to transfer the first data byte across the SCSI bus to the initiator When data is present in the buffer the read access time for the half high tape drive is 1 8 msec in start stop mode and 3 1 msec in streaming mode When no data is present in the buffer first read operation after the tape is loaded the read access time is approximately 8 seconds EXB 8205 and EXB 8505 510505 Standard and XL Reposition 6 Software Integration Issues Reposition time starts when the initiator issues a command that stops the tape drive s motion control system and ends when the tape is repositioned at normal speed so that the next byte of data can be transferred Reposition time is independent of any interface delays The reposition time for the half high tape drive is 1 2 to 1 5 seconds Retensioning of tape after tension has been released The tape drive can perform tape motion commands only when the tape is tensioned The drive releases tape tension under the following conditions When the tape is at LBOT and the drive has not received a tape motion command within 5 seconds When the tape is not at LBOT and the drive has not rec
55. an set threshold and SELECT cumulative values for the counters or reset the counters Returns the values of the counters managed by the LOG SELECT command These values provide the initiator with statistical information about the read and write error recovery operations that the tape drive has performed Changes the drive s internal medium logical unit or device parameters to values specified by the initiator Provides the initiator with information about the drive s internal medium logical unit and device parameters 7 4 EXB 8205 and EXB 8505 510505 Standard and XL PREVENT ALLOW MEDIUM REMOVAL 7 SCSI Integration Prevents or allows the removal of the data cartridge from the tape drive When the PREVENT MEDIUM REMOVAL command is in effect the drive s unload button is disabled READ Transfers data from the tape to the initiator READ BLOCK LIMITS Provides the initiator with information about the maximum and minimum logical block lengths that the tape drive can support for read and write operations in the current operating mode READ BUFFER Copies the tape drive s microcode to the initiator This command is used in conjunction with the WRITE BUFFER command to copy one drive s microcode to another drive READ POSITION Reports the current logical position of the tape to the initiator This allows the initiator to store the position for later use in locating data with
56. ape drive Evaluation Power Verifies that no recorded data will be lost as a result of a power loss during Loss Restore a read operation Data Integrity High Speed Search Verifies the tape drive s high speed search capabilities by issuing searches Functionality to random locations on the tape 3 4 Availability of Test Results All DVT test results are available on request from Exabyte Results from the Performance at Stress Conditions test generally will provide you with all the information you need to predict the overall reliability of a tape drive in a wide range of operating environments Results from the individual tests described in Table 3 2 can provide further information if you have areas of particular concern Contact your account manager to request DVT test results 3 6 EXB 8205 and EXB 8505 510505 Standard and XL Hardware Integration Issues Installing a half high tape drive into a final product is a straightforward procedure The tape drive provides a number of mounting options and has just a few requirements regarding SCSI setup and the operating environment This chapter discusses the following hardware integration issues Tape drive mounting requirements Thermal considerations for half high enclosures SCSI installation requirements Options for setting the SCSI ID Environmental considerations Power and grounding considerations Product compliance standards May 1994 EXB 8205 and EXB 8505 4 1
57. ape drive in unauthorized packaging may damage the unit and void the warranty If you are returning the tape drive for repair package it in its original packaging or in replacement packaging obtained from your vendor Refer to the packing instructions in EXB 8205 and EXB 8505 Installation and Operation If problems with the tape drive occur contact your maintenance organization do not void the product warranty by allowing untrained or unauthorized personnel to attempt repairs May 1994 EXB 8205 and EXB 8505 iii Standard and XL Changes and Enhancements to This Manual This revision 510505 002 of EXB 8205 and EXB 8505 8mm Cartridge Tape Subsystems Integration and Optimization for Standard and eXtended Length XL Configurations replaces the EXB 8205 and EXB 8505 Integration and Optimization manual This manual includes the following changes and enhancements Information for the eXtended Length XL configurations of the EXB 8205 and EXB 8505 has been included Where differences exist among these products these differences are noted Information about the new EXATAPE 160m XL 8mm Data Cartridge which is designed for use in the XL tape drives has been included The list of phone numbers for Exabyte support has been updated and expanded The information about terminating the SCSI bus and setting the SCSI ID has been updated The recommendations for using the Exabyte 8mm Cleaning Cartridge in half high tape drives have
58. ard and XL 2 Introduction to Half High Tape Drives Multiple Host LAN with a Tape Drive and Additional Devices SCSI Bus Initiator Host 2 LAN LAN Server Initiator Host 1 Automated Tape Tape Printer Library Drive Figure 2 5 Half high tape drive in a multiple host multiple device environment Half high tape drives in a multiple host multiple device environment can provide backup for any or all hosts devices on the LAN or other devices on the SCSI bus As an example a tape drive can provide dedicated backup for a specific device while an automated tape library provides backup for the entire network May 1994 EXB 8205 and EXB 8505 2 11 Standard and XL 2 Introduction to Half High Tape Drives 2 6 Tape Drives in Changing and Expanding Configurations an Example As a company s computing needs evolve system administrators can integrate Exabyte tape drive back up solutions into changing and expanding network configurations A good example of such an expanding configuration is Exabyte Corporation s own local area network LAN and wide area network WAN Shown in Figure 2 6 the Exabyte LAN in Boulder Colorado consists of approximately 1 700 PCs and workstations attached to 15 file servers The LAN encompasses five buildings in Boulder and provides access to approximately 250 PCs and 10 file servers in Exabyte offices around the world The network is continually being expanded as
59. be EG hee bee bee eee ee nee 4 17 4 6 Power and Grounding Considerations 2 000000 4 18 Power Supply a s cero ecet adp ia Pas 524 ewe ES eee ee KES 4 18 Additional Chassis Grounding ooa eee RO EGG 4 18 Power Cable and Connector ooo 0 a e a 4 19 4 7 Froquct Compliance Standards se ste su ea p ke e a a a ee ES ESS eG 4 20 5 Half High Tape Drive Maintenance 5 1 5 1 What Causes a Tape Drive to Require Cleaning oaa 5 2 5 2 Determining When to Clean the Tape Drive naana 5 3 Time to Clean LED Indication ooa a 5 3 REQUEST SENSE Command aaaea aaa a 5 3 5 3 Using an Exabyte Approved Cleaning Cartridge noaoo 5 4 What About Other Cleaning Cartridges naaa be ee es 5 4 Procedure for Cleaning a Tape Drive sc 4 s6 8 644424254 942 bk ees 5 5 6 Software Integration Issues 6 1 6 1 Tape Drive Timing Considerations s s pre sa s spa mes digs beh ew oY as 6 2 6 2 Converting a Full High Driver to a Half High Driver 6 4 6 3 Adding XL Support to a Half High Driver 0 000 0 6 6 7 SCSI Integration 7 1 7 1 Overview of SCSI Communications 0 0 0 000008 eee ee eee 7 2 SCSI Commands 0 0 000 ee ERREEN 7 4 SCSI Command Status oaa ee 7 6 So Messages suuna s auan E e N en ee eee eR EEE ee Ee 7 7 7 2 Disconnecting from the SCSI Bus 2 i lt s lt 3s seve eve bd bowen we eG 7 9 7 3 Optional Enhanced SCSI Bus Performance 24 2 5 254 ween eo eee 7 10 In
60. beginning of that partition To erase the data from an entire tape without eliminating the partitions you must erase both partitions separately Unloading the Tape The UNLOAD command works exactly as it would for a single partition tape You can issue the UNLOAD command from either the first or the second partition The tape drive rewinds the tape to the physical beginning of tape PBOT unloads the tape from the tape path and ejects the cartridge EXB 8205 and EXB 8505 510505 Standard and XL 8 Optimizing the Performance of Your Tape Drive Appending Data to a Previously Written Tape Each tape drive can write data to a cartridge that already has data on it without overwriting the pre existing data A few restrictions apply Only one data format is permitted on any tape For example if an EXB 8505 appends data to a tape that contains 8200 format data the new data must also be in 8200 format Note that the tape drive automatically determines the format of the data already on the tape you cannot select a different format Data can be appended at certain tape positions only Depending on the data format new data can be appended to old data at certain places only as indicated in Table 8 4 Table 8 4 Where you can append new data on a previously written tape 8200 8200c 8500 EXB 8505 and EXB 8505XL only 8500c EXB 8505 and EXB 8505XL only The EOD mark long filemark or setmark is overwritten as ad
61. cates the block address at the current logical location It also indicates the number of the partition the tape is located in When you use the LOCATE command to search for that logical position you specify which partition the drive should search for the requested block Reading Data To read data use the READ command just as you would with a standard tape However remember that if you want to read data in the partition the tape is not currently in you must use the LOCATE or MODE SELECT command to reposition the tape to that partition After you have issued a command to relocate to a new partition you can use a LOCATE command or SPACE command to move the tape to a legal position for reading data Rewinding the Tape When you issue a REWIND command the tape drive rewinds the tape to the beginning of the current partition If the tape is positioned in the first partition the drive rewinds the tape to the logical beginning of the tape LBOT If the tape is positioned in the second partition the drive rewinds the tape to the logical beginning of the second partition LBOP 0 If you want to rewind to LBOT and the tape is positioned in the second partition do not use the REWIND command Instead use the LOCATE command to position the tape to the beginning of the first partition LBOP 1 or LBOT Erasing the Tape The ERASE command acts upon only one partition at a time After erasing the partition the tape drive rewinds the tape to the
62. ce and head and tape life Another factor that can cause a tape drive to require cleaning is debris from the tape All tapes generate some amount of debris A new tape can contain debris created during the manufacturing process that is shed into the tape path the first few times the tape is used Throughout its life a tape generates small amounts of debris from its edges where the base film is exposed An overused or improperly stored and handled tape can also generate debris due to damage such as cracking The main consequences of operating a tape drive without regular cleaning are poor performance and eventually drive failure The debris introduced from the environment and generated by the tapes can build up in the tape path and on the recording heads This increases head wear and reduces recording reliability and tape life Error rates typically increase and permanent damage of the recording heads may occur EXB 8205 and EXB 8505 510505 Standard and XL 5 Half High Tape Drive Maintenance 5 2 Determining When to Clean the Tape Drive You should clean the tape drive s heads and tape path either once a month or after every 30 tape motion hours whichever occurs first This cleaning frequency does not depend on the format in which you write and read data However if you are using the drive ina particularly dirty environment or if you operate it infrequently you may want to clean the drive more often than every 30 tape motion hou
63. characteristics surface texture and tape thickness is assured May 1994 EXB 8205 and EXB 8505 9 3 Standard and XL 9 Selecting and Maintaining Tapes 9 4 EXATAPE shelf life exceeds 30 years A special powder protects the tape s metal particles and creates a highly uniform recording surface This ensures reliable recording and data preservation Based on accelerated environmental tests EXATAPE shelf life can be expected to exceed 30 years when stored under recommended environmental conditions EXATAPE data cartridges withstand 1 500 tape passes Tests involving repeated tape passes in which the entire tape is written or read show that an EXATAPE data cartridge can withstand up to 1 500 passes when used according to recommendations EXATAPE surfaces reduce head and tape path wear and protect the tape from damage due to frictional changes The texture of the recording surface minimizes head wear The backcoating prevents damage from repeated frictional changes associated with complex start stop activity The EXATAPE cartridge shell maximizes tape protection The cartridge shell is highly heat resistant to avoid physical deformation when exposed to high temperatures It is also highly static resistant to reduce the attraction of dust and debris that could contaminate the tape surface Each EXATAPE 8mm Data Cartridge comes with a limited lifetime warranty Each cartridge is warranted against defects in material and wor
64. cy delay May 1994 This is the time required to flush the buffer before the tape drive can execute a tape motion command The MODE SELECT Motion Threshold and Reconnect Threshold affect this timing To avoid the buffer latency delay you can issue a WRITE FILEMARKS command with a count of 0 after every write operation to flush the buffer EXB 8205 and EXB 8505 6 3 Standard and XL 6 Software Integration Issues 6 2 Converting a Full High Driver to a Half High Driver If you have been supporting any of the Exabyte full high tape drives EXB 8200 EXB 8200SX EXB 8500 or EXB 8500c and want to convert an existing driver to support one of the half high tape drives you need to consider the issues listed in Table 6 2 If you are converting a full high driver to support one of the XL tape drives EXB 8205XL or EXB 8505XL accommodate the issues listed in the table first Then refer to Section 6 3 on page 6 6 for information about adding support for XL Note If you wish to use an existing full high driver for a half high tape drive without modifications you can obtain EEPROM images from Exabyte that enable half high drives to emulate full high drives See page 2 7 for information about ordering EEPROM images Table 6 2 Converting a full high driver to a half high driver Implementing SCSI 2 commands Checking for illegal or new density code values Changing the product identification value in INQUIRY data
65. data on a 112m EXATAPE 8mm Data Cartridge assuming an average 2 1 compression ratio The EXB 8505XL 8mm Cartridge Tape Subsystem The EXB 8505XL is an EXB 8505 configured with the eXtended Length media feature The EXB 8505XL can store up to 14 0 gigabytes of data on an EXATAPE 160m XL 8mm Data Cartridge assuming an average 2 1 compression ratio Fahrenheit Federal Communications Commission Fault Symptom Code This byte is returned as byte 28 of the REQUEST SENSE extended sense data The FSC is an Exabyte unique byte used to indicate the specific nature of hardware and software errors or other events Gigabyte Hexadecimal base 16 numbering system The computer system that acts as the initiator of an operation Hertz Identification Improved Data Recording Capability The compression algorithm licensed from IBM and used by the EXB 8205 EXB 8205XL EXB 8505 EXB 8505XL and EXB 8500c International Electrotechnical Commission A host computer system that requests an operation to be performed by the target EXB 8205 and EXB 8505 510505 Standard and XL May 1994 Iso KByte LBOP LBOT LEOP LEOT LUN MByte mm motion threshold ms or msec um us or usec ns NSTA partition PBOP PBOT Glossary International Standards Organization Kilobyte Logical beginning of partition Logical beginning of tape Logical end of partition Logical end of tape Logical unit number Megabyte Millimeter 0
66. ditional data is written to tape May 1994 EXB 8205 and EXB 8505 8 15 Standard and XL 8 Optimizing the Performance of Your Tape Drive High Speed Search Using the SPACE Command The SPACE command enables you to perform high speed positioning at 75 times the normal tape motion rate 10 times for 8200 format Depending on the tape format you can use the SPACE command to space forward or backward to logical blocks filemarks setmarks and the end of data Table 8 5 describes the different types of high speed search space operations available Table 8 5 High speed search operations using the SPACE command 8200 8200c 8500 EXB 8505 and EXB 8505XL only 8500c EXB 8505 and EXB 8505XL only To perform this operation in 8200 format you must have a special EEPROM image See page 2 7 for information about ordering EEPROM images For detailed information about using the SPACE command refer to the EXB 8205 and EXB 8505 SCSI Reference 8 16 EXB 8205 and EXB 8505 510505 Standard and XL May 1994 8 Optimizing the Performance of Your Tape Drive High Speed Search Using the READ POSITION and LOCATE Commands A typical scenario in which positioning at high speed is important is retrieving individual files from a tape If a tape is formatted with two partitions the first partition can contain a directory while the second partition can contain all of the data f
67. ds with Check Condition status with the sense key set to Aborted Command EXB 8205 and EXB 8505 Standard and XL 7 7 7 SCSI Integration The initiator sends this message to clear the present operation The tape drive responds by flushing the buffer and releasing the bus to the Bus Free phase Either the tape drive or the initiator may send this Message message to indicate that the last message received was Reject inappropriate or not implemented The initiator sends this message when the tape drive expects the Message Out phase to occur but no other No message is appropriate The drive resumes its Operation operation without interruption after receiving a No Operation message The initiator sends this message when the previous Message message it received had a parity error The tape drive Parity Error responds by resending the last message The initiator sends this message to reset a specific device on the bus The tape drive responds by aborting Bus the current operation releasing the bus and performing Device Reset a reset All data in the buffer is lost as a result of the reset The tape drive or the initiator sends this message to establish the physical path The Identify message Identify indicates whether the sender supports the disconnect privilege In the message is sent from the tape drive to the initiator Out the message is sent from the initiator to the tape drive
68. e Integration Issues Thermal Considerations for Half High Enclosures Half high tape drives contain three critical heat generating areas that are defined by the placement of the cards in the drive and the power supply Figure 4 4 shows the placement of the cards in an EXB 8505 SUA Card SSV Card SLD Card PR Card Figure 4 4 Card placement in the EXB 8505 shown and EXB 8205 The area between the two horizontal cards the SLD and the SUA VUA for the EXB 8205 cards contains the most heat The highest concentration of heat is in the area surrounding the intersection of the two horizontal cards and the two vertical cards the SSV and the SPR VPR for the EXB 8205 cards on the left rear side of the tape drive The SSV card contains several heat generating components along the left side of the tape drive Most of the heat generating components are placed on card exteriors to conduct and radiate heat to the metal frame and to allow for convection using the critically placed vents in the frame The placement of the power supply requires a separate cooling path because of the amount of heat it generates EXB 8205 and EXB 8505 510505 Standard and XL 4 Hardware Integration Issues Cooling Paths in the Mini Tabletop Enclosure 1 Wil Ful Gi a LYS f Ly fa Vi Mi Wi Wi fh d Primary Cooling Path 2 Secondary Cooling Path 3 Tertiary Cooling Path
69. eived a tape motion command within 15 seconds The retension time for the half high tape drive is approximately 1 5 seconds Restarting of drum motion after motion has been suspended The tape drive stops drum motion after releasing tape tension if it does not receive a tape motion command within 60 seconds The drive cannot perform a tape motion command until drum motion has resumed The half high tape drive restarts drum motion in approximately 7 seconds Rewind data cartridge Rewind time starts when the initiator issues a REWIND command and ends when the tape drive returns a Command Complete message for a non immediate rewind The rewind time is based on the following assumptions The tape is positioned at LEOT when the REWIND command is issued The drum is still rotating Tape tension has not been released The rewind time for a 112m cartridge is approximately 170 seconds For the EXB 8205XL and EXB 8505XL only the rewind time for a 160m XL cartridge is approximately 240 seconds Data cartridge unload The unload operation involves rewinding the tape from LBOT to PBOT removing the tape from the tape path and ejecting the cartridge Additional time must be added under the following circumstances The tape is not at LBOT add rewind time There is unwritten data in the buffer add time to write the data to tape The unload time for the half high tape drive is approximately 19 seconds Buffer laten
70. elf test No Tape Installed Verifies that the tape drive can successfully execute its power on self test Code Load Tape Functionality Verifies that the tape drive can successfully recognize a code load tape download the code and eject the tape Serial Port Functionality Verifies that the tape drive can successfully perform a monitor dump and download code through its serial port Cleaning Tape Recognition Verifies that the tape drive can successfully recognize the insertion of a cleaning cartridge and perform the required cleaning routine Tape Load Functionality Verifies that the tape drive can successfully load a tape and become ready Power on Self test Tape Installed Verifies that the tape drive can successfully execute its power on self test with a tape loaded and become ready Voltage Margin Guard Band Verifies that the tape drive will accurately perform read and write operations within 5 of specified voltage and determines how far outside of this limit the drive will continue to operate Write Read Error Rate Evaluation May 1994 Verifies the tape drive s write and read performance for random data patterns All data formats supported by the drive are tested EXB 8205 and EXB 8505 3 5 Standard and XL 3 Product Testing Read Interchange Verifies that the tape drive is able to read tapes that are written by another Error Rate compatible Exabyte t
71. er program Table 6 1 Timing considerations for tape drive applications Power on self test POST A power on self test POST occurs each time you apply power to the tape drive During POST the drive performs its internal diagnostics The half high tape drive completes POST in approximately 30 seconds Initialization Following a SCSI bus reset or Bus Device Reset message the tape drive must initialize before it can respond to any SCSI bus signals After initialization the half high tape drive responds on the SCSI bus within 250 milliseconds Data cartridge load Load time is the time required for the tape drive to position the tape to LBOT logical beginning of tape after the cartridge is inserted During the load operation the drive spaces forward from PBOT physical beginning of tape and determines the format of data on the tape if previously written the adaptive servo parameters which enable the drive to read tapes written by other 8mm tape drives and the length of the tape The half high tape drive loads a data cartridge in approximately 40 seconds Write access Write access time starts when the tape drive receives the last byte of the WRITE command when the initiator de asserts ACK and ends when the drive asserts REQ to request that the initiator transfer the first data byte across the SCSI bus The write access time for the half high tape drive is 1 7 msec in start stop mode and 3 1 msec in stre
72. ering EEPROM Options When you order a half high tape drive you can select which if any EEPROM options you want to change from their standard settings Using the information on your EEPROM option order form Exabyte will create a customized EEPROM image containing all of your selections Once you have defined your EEPROM requirements each half high tape drive you purchase will be factory configured with your customized EEPROM image Contact your account manager to order your EEPROM options If you need help in selecting EEPROM options contact Exabyte Technical Support EXB 8205 and EXB 8505 2 7 Standard and XL 2 Introduction to Half High Tape Drives 2 5 Sample Configurations The following are a few examples of configurations in which half high tape drives can provide effective data backup Half high tape drives adapt well to a wide variety of configurations The drives come in either single ended or differential SCSI models operate with a wide variety of host bus adapter cards and run on many types of platforms through numerous backup utilities Single Host with a Tape Drive SCSI Bus Figure 2 2 Half high tape drive in a single host environment A half high tape drive in a single host environment provides dedicated secure backup for the host Data cartridges provide inexpensive data protection for either on site or off site storage 2 8 EXB 8205 and EXB 8505 510505 Standard and XL 2 Introduction to Hal
73. f EXATAPE 8mm Data Cartridges and Exabyte 8mm tape drives not supported automatically ejected Y not supported not supported May 1994 EXB 8205 and EXB 8505 9 5 Standard and XL 9 Selecting and Maintaining Tapes 9 6 Conditioning Non EXATAPE Data Cartridges EXATAPE 8mm Data Cartridges do not require conditioning before use If for some reason you need to use data cartridges other than EXATAPE cartridges in an Exabyte tape drive it is highly recommended that you condition those tapes before using them for data storage Tapes from other manufacturers may contain manufacturing generated debris and may shed a certain amount of debris from the tape edges during the first few uses Conditioning these tapes will remove this debris General Rule Any data cartridge other than an EXATAPE cartridge should undergo at least four but not more than twenty full passes before being used for data storage Procedure for Conditioning a Tape Perform tape conditioning on a tape drive that is operating within specifications with no history of tape damage To condition a new tape follow these steps Acclimate the tape to its environment If you have brought the tape from an environment with a temperature or humidity different from the environment you will condition it in allow at least 24 hours for the tape to stabilize in the new environment Read and write data for a total of four tape passes Using normal
74. f High Tape Drives Single Host with a Tape Drive and Additional Devices LAN LAN Server Initiator Host SCSI Bus Printer Figure 2 3 Half high tape drive in a multiple device environment A half high tape drive in a multiple device environment can provide dedicated backup for the host and if the host is attached to a local area network LAN backup for other devices on the network Because the tape drive requires very little internal SCSI cable length there is ample room for additional devices on the bus Through its disconnect option the tape drive permits easy bus access for the other bus devices May 1994 EXB 8205 and EXB 8505 2 9 Standard and XL 2 Introduction to Half High Tape Drives Single Host with a Tape Drive and Additional Devices on Multiple SCSI Buses SCSI LAN LAN Server SCSI Automated Initiator Host Bus Tape 1 Library Figure 2 4 Half high tape drive in a multiple SCSI bus environment Half high tape drives in a multiple SCSI bus environment can provide backup for the host devices on the LAN and other devices on either SCSI bus As shown in the figure a tape drive might be located on one SCSI bus and an automated tape library on another Files can be retrieved through one device without interrupting archiving operations on the other device 2 10 EXB 8205 and EXB 8505 510505 Stand
75. ference 510806 EXB 210 8mm Library Product Specification 510807 EXB 210 8mm Library Operator s Guide 510808 EXB 210 8mm Library Error Codes 510809 EXB 210 8mm Library Installation 510810 Mini Tabletop 8mm Cartridge Tape Subsystem Installation 520156 Mini Tabletop 8mm Cartridge Tape Subsystem Product Specification 520154 CTS Monitor CTS Monitor Getting Started 510206 Standards ANSI Small Computer System Interface SCSI X3 131 1989 ANSI Small Computer System Interface 2 SCSI 2 X3 131 1990 ANSI ISO IEC 11319 Information Technology 8mm Wide Magnetic Tape Cartridge for Information Interchange Helical Scan Recording ISO IEC 12246 Information Technology amp mm Wide Magnetic Tape Cartridge Dual Azimuth Format for Information Interchange Helical Scan Recording EXB 8205 and EXB 8505 510505 Standard and XL Exabyte Support The first thing you need to know as you begin to integrate a half high tape drive is what type of support you can obtain from Exabyte and how to contact us Table 1 1 starting on the following page is a quick guide to Exabyte support In addition you may want to know which software vendors already provide packages that support Exabyte half high tape drives On page 1 4 a partial listing of these software vendors is provided An up to date list is available from your Exabyte account manager May 1994 EXB 8205 and EXB 8505 1 1 Standard and XL 1 Exabyte Support Table 1 1 How t
76. g Tapes Notes 9 16 EXB 8205 and EXB 8505 510505 Standard and XL Glossary 8200 format 8200c format 8500 format 8500c format ANSI ASC May 1994 A non compressed data format written and read by the EXB 8200 EXB 8200SX EXB 8205 EXB 8205XL EXB 8500 EXB 8500c EXB 8505 and EXB 8505XL A compressed data format written and read by the EXB 8205 EXB 8205XL EXB 8500c EXB 8505 and EXB 8505XL A non compressed data format written and read by the EXB 8500 EXB 8500c EXB 8505 and EXB 8505XL A compressed data format written and read by the EXB 8500c EXB 8505 and EXB 8505XL American National Standards Institute Additional Sense Code This byte is returned as byte 12 of the REQUEST SENSE extended sense data The ASC in conjunction with the Additional Sense Code Qualifier ASCQ provides additional information about each sense key EXB 8205 and EXB 8505 G 1 Standard and XL Glossary ASCQ ATN AWG b BOT BSY bus devices byte Cc Canadian DOC cm Compression Integrity Check connect CRC CSA CTS disconnect early warning ECC EXB 8205 and EXB 8505 Additional Sense Code Qualifier This byte is returned as byte 13 of the REQUEST SENSE extended sense data The ASCQ in conjunction with the Additional Sense Code ASC provides additional information about each sense key Attention signal The SCSI bus signal asserted by the initiator to indicate that it has
77. gement and explains how tape drives fit into this highly effective data storage model Chapter 3 Product Testing describes the different types of tests performed throughout the design and manufacture of tape drives and explains how to obtain test results from Exabyte that will shorten the integration process Chapter 4 Hardware Integration Issues discusses tape drive mounting requirements thermal considerations for drive enclosures SCSI installation requirements environmental limits for temperature humidity and particulate contamination and power and safety requirements Chapter 5 Half High Tape Drive Maintenance discusses the cleaning requirements of a tape drive and describes the proper cleaning procedure Chapter 6 Software Integration Issues discusses issues you must consider when creating a new driver program converting a driver program or adding support for one of the XL tape drives Chapter 7 SCSI Integration provides an overview of the Small Computer System Interface SCSI implemented by the tape drives and discusses driver integration issues and options for customizing your SCSI configuration Chapter 8 Optimizing the Performance of Your Tape Drive provides guidelines to help you maximize the amount of data you can store with your drive and provide for easy access to that data Chapter 9 Selecting and Maintaining Tapes explains how to select quality data cartridge
78. ges use of the following types of video grade tapes in the EXB 8205 EXB 8505 and XL drives X Extended length video tapes such as 135 140 and 150 minute tapes The added length and the variation in positioning of the cartridge recognition holes can lead to unpredictable performance and unreliable detection of the cartridge Furthermore the increased length cannot be used by the tape drive for added data capacity X Hi 8 metal particle MP The magnetic properties of Hi 8 MP are significantly different from tape drive requirements and can cause increased error rates X Hi 8 metal evaporative ME The films used in Hi 8 ME tapes can experience cracking that reduces recording reliability and durability Debris from the tape can reduce tape drive head life X Hi 8 barium ferrite BaFe Current formulations of Hi 8 BaFe tapes are not acceptable for any use in tape drives Drive heads are not designed for this type of media EXB 8205 and EXB 8505 510505 Standard and XL 9 Selecting and Maintaining Tapes What Type of Data Grade Tape Once you have decided to use data grade tape you will find a wide range of tape formulations to choose from A number of 8mm tape cartridges are now marketed for data storage use While they may be labeled data grade or data quality some may actually contain only video grade tape Even tape that is acceptable for data storage can vary widely in consistency durability and long term
79. hase but in a different sequence of bus activity include Extended Message Synchronous Data Transfer Request Save Data Pointers Restore Pointers Disconnect Message Reject Identify EXB 8205 and EXB 8505 7 3 Standard and XL 7 SCSI Integration SCSI Commands The half high tape drives support the SCSI commands shown in Table 7 2 Table 7 2 Supported SCSI commands Erases the tape starting from the current legal position to the physical end of tape PEOT Rewinds the tape when finished Provides the initiator with information about the drive s device INQUIRY parameters including product and vendor identification Loads or unloads a data cartridge When loading a cartridge the drive places the tape in the tape path and positions it at the logical beginning of tape LBOT or the logical beginning of the default partition When unloading a data cartridge the drive LOAD writes any buffered information to the tape rewinds the tape to UNLOAD the physical beginning of the tape PBOT removes the tape from the tape path and ejects the data cartridge unless ejection has been prevented by a PREVENT ALLOW MEDIUM REMOVAL command Positions the tape at a specified logical position Typically this position is determined by data that was obtained through a LOCATE previous READ POSITION command Manages a set of internal counters regarding read and write LOG error recovery operations The initiator c
80. he EXB 8200 is a 5 25 inch full high tape drive that can store up to 2 5 gigabytes of dataon an EXATAPE 112m 8mm Data Cartridge The EXB 8205 8mm Cartridge Tape Subsystem The EXB 8205 is a 5 25 inch half high tape drive that can store up to 5 0 gigabytes of dataon an EXATAPE 112m 8mm Data Cartridge assuming an average 2 1 compression ratio The EXB 8205XL 8mm Cartridge Tape Subsystem The EXB 8205XL is an EXB 8205 configured with the eXtended Length media feature The EXB 8205XL can store up to 7 0 gigabytes of data on an EXATAPE 160m XL 8mm Data Cartridge assuming an average 2 1 compression ratio The EXB 8200SX 8mm Cartridge Tape Subsystem The EXB 8200SX is very similar to the EXB 8200 but offers a high speed search capability The EXB 8500 8mm Cartridge Tape Subsystem The EXB 8500 is a 5 25 inch full high tape drive that can store up to 5 0 gigabytes of dataon an EXATAPE 112m 8mm Data Cartridge Standard and XL Glossary EXB 8500c EXB 8505 EXB 8505XL FCC FSC GByte host Hz IDRC IEC initiator The EXB 8500c 8mm Cartridge Tape Subsystem The EXB 8500c is physically similar to the EXB 8500 but offers data compression as an option Assuming an average ratio of 2 1 the EXB 8500c can store up to 10 0 gigabytes of data on an EXATAPE 112m 8mm Data Cartridge The EXB 8505 8mm Cartridge Tape Subsystem The EXB 8505 is a 5 25 inch half high 8mm tape drive that can store up to 10 0 gigabytes of
81. he directory support feature with your EEPROM image see Section 2 4 EXB 8205 and EXB 8505 8 17 Standard and XL 8 Optimizing the Performance of Your Tape Drive Obtaining Status Information Using the REQUEST SENSE LOG SELECT and LOG SENSE Commands During tape drive operation you may want to inquire about the status of the drive after processing a basic command when an error condition has occurred to check the settings for performing diagnostics or to check on the number of read or write errors Use the commands described below to obtain this information from the tape drive REQUEST SENSE Command When you receive a Check Condition status use the REQUEST SENSE command to determine the type of error or to determine the tape drive s status For errors this command returns the following information m Sense key for the error that indicates the type of error such as Not Ready Hardware Error Illegal Request Unit Attention Aborted Command m Additional Sense Code ASC that indicates the type of error for the given sense key Additional Sense Code Qualifier ASCQ that indicates the specific error for the sense key and ASC m Fault Symptom Code FSC that indicates the specific nature of hardware and software errors or other events the FSC is an Exabyte unique byte Note The FSC can also be used to determine the location of errors in data sent with a LOG SELECT or MODE SELECT command INQUIRY Command Yo
82. he power connector are keyed so that they fit together in only one way Before connecting the plug to the tape drive be sure that the beveled edges of the plug are oriented in the same way as the beveled edges on the power connector Do not force the plug into the connector or you may damage the tape drive EXB 8205 and EXB 8505 4 19 Standard and XL 4 Hardware Integration Issues 4 7 Product Compliance Standards All Exabyte half high tape drives are certified as components that comply with the regulatory standards listed in this section When properly installed in a shielded cabinet with shielded cables and adequate grounding of the SCSI bus and input power the tape drive can be expected to maintain its compliance with these standards Any required certification of the final system containing the tape drive is the responsibility of the system integrator Note Exabyte products that contain an enclosed half high tape drive such as the Mini Tabletop 8mm Cartridge Tape Subsystem can be resold with no further certification Product Safety Standards UL 1950 1st Edition Information Technology Equipment including Electrical Business Equipment ma CSA C22 2 No 950 M839 Safety of Information Technology Equipment including Electrical Business Equipment m EN60950 TEC950 DIN VDE 0805 05 90 Safety of Information Technology Equipment including Electrical Business Equipment Electromagnetic Interference EMI m FCC Rules and
83. he right side of the socket 4 10 EXB 8205 and EXB 8505 510505 Standard and XL May 1994 4 Hardware Integration Issues Optional Termination for the Single Ended Tape Drive If desired you can terminate the single ended tape drive externally by removing the R packs from the back of the drive and installing an external terminator Exabyte recommends a Methode Electronics Inc dataMate DM103 02 0 or equivalent single ended external terminator Termination for the Differential Tape Drive The differential tape drive does not include internal terminators If a differential drive terminates the SCSI bus it must be terminated externally Exabyte recommends a Methode Electronics Inc dataMate DM103 01 0 or equivalent differential external terminator Termination for the Mini Tabletop Cartridge Tape Subsystem The Mini Tabletop Cartridge Tape Subsystem does not include internal SCSI bus terminators If the Mini Tabletop Cartridge Tape Subsystem is the last device on the SCSI bus attach an external terminator to either one of the SCSI connectors Differential Exabyte recommends a Methode Electronics Inc dataMate DM800 08 0 differential external terminator Single Ended Exabyte recommends a Methode Electronics Inc dataMate DM800 09 0 single ended external terminator EXB 8205 and EXB 8505 4 11 Standard and XL 4 Hardware Integration Issues 4 4 Options for Setting the SCSI ID You can set the SCSI ID for the ha
84. iles By using the READ POSITION and LOCATE commands you can establish an effective high speed search method for accessing the files on such a tape Note that you do not have to use partitions to make effective use of the READ POSITION and LOCATE commands A simple example of the steps involved in such an application follows Issue a MODE SELECT command to format a new tape to contain two partitions The first partition will contain the master directory for the tape the second will contain the data Write files to the second partition on the tape At the beginning of each file issue a READ POSITION command to determine the exact starting location of the file Store the READ POSITION data for each file in the initiator s memory E Issue a MODE SELECT or LOCATE command to move to the first partition on the tape Write the information from the READ POSITION commands for all the files to the first partition This becomes the master directory for the tape O When you need to access a particular file on the tape read the master directory to find out where that file is located Then issue a LOCATE command to position the tape at high speed to that file For detailed information about using the READ POSITION and LOCATE commands refer to the EXB 8205 and EXB 8505 SCSI Reference Note Partitions are available in 8500c format only If you are writing data in any other format and want to set up a directory on the tape request t
85. imum amount of free space that must be in the tape drive s buffer before the drive reconnects to the initiator and data transfer from the initiator to the buffer resumes When a disconnect occurs during a streaming read operation the minimum amount of data that must be in the tape drive s buffer before the drive reconnects to the initiator and data transfer from the buffer to the initiator resumes The reconnect threshold is measured in 3 KByte increments See also motion threshold Small Computer System Interface An octal representation of the unique address 0 7 assigned to a SCSI device The bit significant representation of the SCSI address referring to one of the signal lines Information sent from the target to the initiator upon completion of a command A bus device usually a peripheral device that performs an operation requested by an initiator The EXB 8205 EXB 8205XL EXB 8505 and EXB 8505XL are targets EXB 8205 and EXB 8505 510505 Standard and XL Index A Additional Sense Code ASC 8 18 Additional Sense Code Qualifier ASCQ 8 18 agency standards 4 20 air flow requirements 4 15 appending data 8 15 ASC 8 18 ASCQ 8 18 backup applications 1 4 blocks data 8 2 to 8 4 bus phases SCSI 7 2 to 7 3 C cartridges See data cartridges chassis grounding 4 18 cleaning 5 1 to 5 6 cleaning cartridge 5 4 to 5 5 commands SCSI 7 4 to 7 6 compatibility data cartridges 9 2 to 9 5 read
86. ing cycle was not performed the LEDs will continue to flash You can also issue a REQUEST SENSE command and check the setting of the CLND bit If set to 1 the CLND bit indicates that a successful cleaning cycle was performed If the CLND bit is 0 the cleaning cycle was not performed If the cleaning cycle was successful you may want to keep a record of the date the cleaning was performed Store the cleaning cartridge for future use if it still has cycles remaining Or discard it if no more cleaning cycles remain EXB 8205 and EXB 8505 5 5 Standard and XL 5 Half High Tape Drive Maintenance Notes 5 6 EXB 8205 and EXB 8505 510505 Standard and XL software Integration Issues This chapter addresses some of the software issues you may encounter when integrating a half high tape drive into a system First tape drive timing issues are discussed Then guidelines for converting an existing driver for a full high tape drive to support a half high tape drive are provided Finally issues you must consider when adding XL support to a driver are addressed May 1994 EXB 8205 and EXB 8505 6 1 Standard and XL 6 Software Integration Issues 6 1 Tape Drive Timing Considerations The mechanics of tape handling in a tape drive combined with data buffering create a number of timing considerations that must be accounted for in an application Table 6 1 is an overview of some of the situations you must account for in your driv
87. ion is Server Tape Drive Offsite locations Figure 2 6 Exabyte s PC and workstation network showing the use of Exabyte tape drives in an expanding network environment Circled numbers indicate the number of each type of device in each location May 1994 EXB 8205 and EXB 8505 2 13 Standard and XL 2 Introduction to Half High Tape Drives 2 7 Tape Drives and Hierarchical Storage Management Data storage has evolved beyond simply keeping all files on a local hard disk Effective storage and retrieval of data often requires a multi level hardware and software strategy This strategy sometimes referred to as hierarchical storage management HSM has replaced simple online storage for the following reasons Increased volume of data The expanded processing capabilities of computer systems combined with the proliferation of graphics multimedia applications and large databases has increased the demand for data access and data storage Increased value of data Many businesses rely on their data to stay in business This data must be securely and reliably stored and protected Often businesses require the storage of data offline and offsite in the event of a disaster High cost of online storage The cost of local hard disk or server storage forces most users to consider options other than online storage for infrequently used data Figure 2 7 is one conception of hierarchical storage management that
88. ion the low cost long shelf life and convenience of data cartridges for offsite transport make tape media an effective solution to offline storage requirements May 1994 EXB 8205 and EXB 8505 2 17 Standard and XL 2 Introduction to Half High Tape Drives Notes 2 18 EXB 8205 and EXB 8505 510505 Standard and XL Product Testing As a systems integrator you are concerned with the performance and reliability of each component that you add to asystem Testing a new product typically adds a tremendous amount of time to the system integration process Exabyte conducts extensive testing of all its products and makes a number of the test results available to customers who integrate tape drives into their systems This chapter describes the types of testing Exabyte performs and provides information about how to obtain test results that can help you speed up your integration process May 1994 EXB 8205 and EXB 8505 3 1 Standard and XL 3 Product Testing 3 1 Types of Tests Table 3 1 is a brief overview of the types of testing that Exabyte performs on all its tape drives Table 3 1 Exabyte reliability tests Engineering verification testing EVT To aid the product development process by testing all parts of the product to make sure it meets specifications and to identify and fix problems early in the development cycle All prototypes of the product are tested to the limits of functionality for performance s
89. ions does not mean that the tape has accumulated the total number of passes associated with each motion Typically when several complex tape motions are combined the number of passes is equal to that of the motion with the highest pass count 9 3 Storing and Maintaining Archived Tapes The key to maximizing the shelf life of your archived tapes is to store and maintain them properly Managing archived tapes involves the following tasks Establishing and maintaining a suitable storage environment Labeling the cartridges and maintaining a storage log Using the write protect switch to prevent erasures and overwrites Storing data cartridges immediately after use Storing the data cartridges in the proper position Testing tapes regularly and replacing them if necessary Establishing and Maintaining a Suitable Environment The storage environment is the single most important factor affecting the shelf life of data cartridges Temperature humidity and particulate contamination must be monitored and maintained at the levels described in this section to maximize tape life Ideally the storage location s temperature and humidity should be maintained at the same levels as in the operating environment of the tape drive that recorded the data However this holds true only if the operating environment is maintained at recommended levels as described in Chapter 4 If the operating environment cannot be maintained at recommended levels it is
90. irements are best satisfied by the local hard disk or an external hard disk added to the workstation For a networked workstation effective online storage is provided by other workstations peripheral hard disks or LAN servers Near Online Storage Near online storage provides a less expensive storage option that does not reduce performance of the hard disks and offers data retrieval without long delays Application software manages the process of storing and retrieving files optimizing disk performance by checking file dates and migrating inactive files to optical disk tape drives and disk or tape libraries For standalone workstations near online storage requirements are best satisfied by attaching a tape drive such as the EXB 8205 or EXB 8505 to the workstation For networked workstations near online storage requirements are best satisfied by attaching a combination of peripheral devices such as an optical disk tape drive and automated library system Offline Storage The final element of HSM is offline storage Unlike online storage quick access is not nearly as important as reliability and low cost Data cartridges in either 8mm 4mm or quarter inch formats offer reliable long term storage that costs significantly less per MByte than disk based solutions For both standalone and networked workstations offline storage requirements are best satisfied by secure storage of individual data cartridges For example the EXB 8205
91. ites data then writes gap block s pass 1 and gap track s Data from the buffer New data from the buffer 2 r Tape motionstops and the tape pass 2 is repositioned backward 3 When the motion threshold is exceeded the tape is repositioned forward to the pass 3 gt end of the last gap track where the drive starts writing new data Figure 9 2 Tape passes during a start stop write operation Estimating the Number of Tape Passes You can estimate the number of passes a tape will undergo by analyzing the types of motions that an application requires Table 9 2 provides guidelines for determining how many tape passes result from various types of motions Table 9 2 Number of tape passes associated with various types of tape activity Writing or reading in streaming mode Writing or reading in start stop mode Spacing forward by blocks Spacing backward by blocks Spacing or searching forward by filemark Spacing or searching backward by filemark Using the LOCATE command to position forward to a logical block Using the LOCATE command to position backward to a logical block 9 8 EXB 8205 and EXB 8505 510505 Standard and XL 9 Selecting and Maintaining Tapes Note that tape passes are not additive unless they are concentrated in the same location Because the tape motions listed in Table 9 2 can occur anywhere on the tape a succession or combination of such mot
92. ive disconnects from the SCSI bus The drive continues to read data into the buffer until the buffer is refilled to the reconnect threshold Then the drive reconnects to the SCSI bus to transfer more data Start Stop Mode When the tape drive is operating in start stop mode it must stop and restart tape motion during write and read operations to accommodate the slower data transfer rate of the host During a start stop write operation the tape drive waits until the buffer is filled to a certain level the motion threshold starts the tape and records the buffered data After writing the data the drive stops tape motion and waits for the buffer to fill to the motion threshold again During a start stop read operation the drive fills the buffer with data from the tape stops the tape waits for the host to accept enough data to empty the buffer to the motion threshold then starts the tape and fills the buffer again EXB 8205 and EXB 8505 8 5 Standard and XL 8 Optimizing the Performance of Your Tape Drive Start stop activity increases the amount of wear on the tape and the drive s recording heads It also decreases the amount of data that can be stored on the tape because gap blocks and gap tracks are written to the tape whenever tape motion has to be stopped Achieving Streaming Mode Table 8 1 shows the data transfer rates that must be achieved to enable the tape drive to operate in streaming mode If the host is capable
93. kmanship Figure 9 1 EXATAPE 8mm Data Cartridges EXB 8205 and EXB 8505 510505 Standard and XL 9 Selecting and Maintaining Tapes Compatibility of EXATAPE 8mm Data Cartridges EXATAPE 8mm Data Cartridges are available in four lengths 15m 54m 112m and 160m XL The EXB 8205XL and EXB 8505XL support all four lengths The EXB 8205 and EXB 8505 do not support the 160m XL tape If you attempt to load any 160m data cartridge into an EXB 8205 or EXB 8505 the drive automatically ejects the cartridge Important EXATAPE 160m XL 8mm Data Cartridges are intended for use in the EXB 8205XL and EXB 8505XL only The 160m XL tape is equipped with a Recognition System stripe located on the tape leader that enables the XL tape drives to recognize the tape as data quality metal particle media To prevent the use of inappropriate media the XL tape drives do not accept 160m tapes without the Recognition System stripe If you attempt to load a 160m tape without this stripe the XL drive automatically ejects it CAUTION Do not use the 160m XL cartridge in Exabyte full high tape drives EXB 8200 EXB 8200SX EXB 8500 and EXB 8500c Although these tape drives will accept the 160m XL cartridge these cartridges are not supported by these drives and should not be used Table 9 1 summarizes the compatibility of EXATAPE 8mm data cartridges with Exabyte 8mm tape drives Table 9 1 Compatibility o
94. leaning Cartridge is designed specifically for use in Exabyte products and if used according to instructions meets the requirements of the tape drive s warranty The Exabyte 8mm Cleaning Cartridge comes in two sizes 3c and 12c Used in the EXB 8205 EXB 8505 or XL tape drives the 3c cleaning cartridge provides up to 9 cleanings The 12c cleaning cartridge provides up to 36 cleanings Note If you use these cleaning cartridges in an Exabyte full high tape drive EXB 8200 EXB 8200SX EXB 8500 or EXB 8500c you will get fewer cleaning passes per cartridge These tape drives have longer tape paths than the EXB 8205 EXB 8505 and XL drives and require more material for each cleaning What About Other Cleaning Cartridges A variety of cleaning cartridges are available for use in video recorders Most of these cleaning cartridges are far too abrasive for tape drive recording heads The cleaning technique employed in these cartridges is equivalent to scouring away debris that has built up on surfaces over an extended period of time Some video cleaning cartridges are designed to be used over and over When you reuse a cleaning cartridge debris is often just recirculated through the tape drive Furthermore some video cleaning cartridges may use liquids that adversely affect the tape mechanism while others can cause a crystalline structure to form on the heads and destroy them CAUTION Do not use a cleaning method other than the Ex
95. lecting and Maintaining Tapes EXAPAK The EXAPAK available from Exabyte provides a way to obtain data cartridges a data cartridge magazine and a cleaning cartridge in one package Each EXAPAK contains nine EXATAPE 8mm Data Cartridges and one Exabyte 8mm Cleaning Cartridge Labels for each of the cartridges and the data cartridge magazine are included If you plan to use the EXAPAK magazine in an Exabyte automated tape library check with your account manager to determine the type of EXAPAK you need to match your library Replacing Data Cartridges Approximately once each year you may want to run each tape through a full pass and check its error statistics If errors have increased significantly since the previous test or if they exceed a certain predetermined threshold you should re archive the data to a new tape and discard the old tape CAUTION If you have any data stored on tapes other than EXATAPE 8mm Data Cartridges be sure to perform this yearly testing to reduce stress on the inner wraps of these tapes When stored for long periods of time some tapes can build up stress on the inner wraps on the tape spools In tapes from some manufacturers this stress can lead to tape damage and the shedding of debris which can damage the tape drive To reduce the chances of this type of damage always use EXATAPE 8mm data cartridges in your tape drives EXB 8205 and EXB 8505 9 15 Standard and XL 9 Selecting and Maintainin
96. lf high tape drive in either of the following ways Attach jumpers shunts to the pins on the tape drive s SCSI ID jumper block Jumpers are already installed on the jumper block when the drive is shipped m Connect a remote switch to the tape drive s SCSI ID jumper block Figure 4 7 shows the location of the SCSI ID jumper block and the associated pin numbers The two methods for setting the SCSI ID are described on the following page SCSI ID jumper block o Ja ggg Figure 4 7 SCSI ID jumper block at the back of the tape drive 4 12 EXB 8205 and EXB 8505 510505 Standard and XL 4 Hardware Integration Issues Setting the SCSI ID with Jumpers To set the SCSI ID using jumpers position the jumpers on the SCSI ID jumper block to obtain the correct address for your tape drive Figure 4 8 shows how to position the jumpers for addresses 0 through 7 Address Address a olo O olo Oo O Figure 4 8 Jumper settings for the SCSI ID Setting the SCSI ID with a Remote Switch To set the SCSI ID with a remote switch not provided remove the jumpers from the SCSI ID jumper block and connect a remote switch assembly to the jumpe
97. ly monitors the compression ratio to determine whether the size of each data block will actually decrease when compressed If the size of a data block cannot be decreased for example if it has already been compressed by the initiator the drive automatically turns off data compression until it encounters a data block that can be compressed Note The benefit of data compression monitoring is seen only when data is transferred from the host in multiple logical blocks If data is transferred a single block at a time turning compression off for the next block has no performance effect since there is no next block with the current command May 1994 EXB 8205 and EXB 8505 8 9 Standard and XL 8 Optimizing the Performance of Your Tape Drive 8 10 Using the EXB 8205 or EXB 8205XL to Write Compressed Data The EXB 8205 and EXB 8205XL write compressed data in 8200c format Because this is the default data format for these drives you do not need to issue any commands to write in this format However keep the following rules in mind The EXB 8205 and EXB 8205XL allow only one format on any one tape You must write the tape entirely in 8200c format or 8200 format When writing to a new tape you must specify the tape s format at the logical beginning of tape LBOT If you do not specify a format the tape drive writes in its power on default format The default format for the EXB 8205 and EXB 8205XL is typically 8200c However an EEPROM
98. m is applied to each of three orthogonal axes for a minimum of 20 minutes per axis The tape drive has been unpacked but no power has been applied d The tape drive has not been unpacked May 1994 EXB 8205 and EXB 8505 4 17 Standard and XL 4 Hardware Integration Issues 4 6 Power and Grounding Considerations When connecting power to a half high tape drive you must consider the following issues m Power supply requirements m Options for additional chassis grounding Power cable and connector requirements In addition before you apply power to a new tape drive for the first time check the MLCH machine level control history label on the top of the drive to determine when the drive was manufactured If the drive was manufactured more than six months earlier Exabyte recommends that you perform a short read write procedure after the initial power on to ensure that the drive s internal lubrication is properly distributed This procedure is described in EXB 5205 and EXB 8505 Installation and Operation Power Supply The half high tape drive operates from standard 5 VDC and 12 VDC supply voltages it does not use external AC power Safety agency certification requires that the supplied voltages for a tape drive be from a Safety Extra Low Voltage source per IEC 950 Refer to the EXB 8205 and EXB 8505 Product Specification for detailed information about power consumption and operating current specifications Addition
99. n help and troubleshooting guidance 1 Exabyte Support Call corporate Technical Support at 1 800 445 7736 303 447 7292 Call end user and distribution customer Technical Support at 1 800 825 4727 913 492 6002 Call European Technical Support at 31 3403 51347 Call Pacific Rim Technical Support at 65 2716331 Anyone with a telecommunications setup can use the electronic bulletin board to receive information about the latest firmware levels manual revisions training and all Technical Bulletins In addition customers can use the bulletin board to send diagnostic information such as SCSI trace data to Technical Support for analysis Dial into the corporate Technical Support bulletin board at 303 447 7100 Bulletin board nickname Banana Boat System Software Galacticomm Modem v 32 v 42bis up to 9600 14400 baud Setup 8 none 1 Dial into the European Technical Support bulletin board at 31 3403 51258 Software Maximus Modem v 32 v 42bis up to 9600 14400 baud Setup 8 none 1 At login first time users can define a unique user ID and password Anyone can obtain information about training for any Exabyte product May 1994 EXB 8205 and EXB 8505 Call corporate Technical Support Training at 303 447 7292 Call European Technical Support Training at 31 3403 51347 Call Pacific Rim Technical Support Training at 65 2716331 1 3 Standard and XL 1
100. new employees are added and new servers and applications are required Distributed Backup Throughout the Exabyte network s existence data back up has always been performed by Exabyte tape drives As the network has grown the back up strategy for the network has evolved into a distributed approach that features the following Approximately 18 Exabyte tape drives distributed around the network to back up multiple servers Completely unattended back up Through the use of Exabyte robotic tape libraries that can process 10 cartridges operator intervention during backup is eliminated Restoration of data involving multiple tapes can also be performed unattended Low impact on the network Most back up operations are scheduled between 2 00 AM and 5 00 AM to take advantage of low use periods on the network With the assistance of hub concentrators bridges routers and subnets individual areas can be backed up separately to further reduce network impact PC node level backups for selected local hard drives Selected PCs in the network can be backed up individually through the local file server to an 8mm tape drive As this example shows whether a network requires one backup system or multiple backup strategies Exabyte tape drives adapt well to the ever changing storage requirements of an evolving network EXB 8205 and EXB 8505 510505 Standard and XL 2 Introduction to Half High Tape Drives Legend PC or yy Workstat
101. nting requirements 4 2 to 4 3 power requirements 4 18 SCSI 4 8 to 4 13 J jumper block SCSI ID jumpers for setting SCSI ID 4 12 to 4 13 4 12 to 4 13 L LOAD UNLOAD command 7 4 8 14 LOCATE command 7 4 8 13 to 8 14 8 17 LOG SELECT command 7 4 8 19 LOG SENSE command 7 4 8 19 logical block packing 8 4 logical blocks 8 2 to 8 4 magazine data cartridge maintenance 5 1 to 5 6 messages SCSI 7 7 to 7 8 Mini Tabletop Cartridge Tape Subsystem 4 4 to 4 7 MODE SELECT command _ 6 3 7 4 8 7 to 8 8 8 10 to 8 11 8 13 to 8 14 8 17 to 8 18 MODE SENSE command 6 6 7 4 motion threshold 8 5 to 8 8 mounting requirements 4 2 to 4 3 9 14 to 9 15 N near online storage 2 16 O P particulate contamination 4 15 partitions 8 12 to 8 14 physical blocks 8 2 to 8 4 power cable 4 19 power connector 4 19 power requirements 4 18 power supply 4 18 PREVENT ALLOW MEDIUM REMOVAL command 7 5 process verification testing 3 2 PVT 3 2 R R packs 4 9 to 4 10 radiated susceptibility 4 21 READ BLOCK LIMITS command 7 5 READ BUFFER command 7 5 READ command 6 2 7 5 8 14 READ POSITION command 7 5 8 14 8 17 RECEIVE DIAGNOSTICS RESULTS command 7 5 reconnect threshold 8 5 to 8 8 regulatory agency standards 4 20 RELEASE UNIT command 7 5 remote switch for setting SCSI ID 4 12 to 4 13 REQUEST SENSE command 5 3 7 5 8 18 RESERVE UNIT command 7 5 resistor terminators 4 9to4 11 resources Exabyte 1 1 to 1 4
102. o obtain Exabyte support Anyone can call with questions about who to buy from Call Exabyte Regional Sales Administrators at 1 800 EXABYTE 1 800 392 2983 913 492 6002 Or in the following locations call Western US 714 582 5211 Central US 708 953 8665 Eastern US 407 352 5622 Canada 416 744 6006 Scotland 44 324 564564 Germany 49 69 590295 The Netherlands 31 3403 51347 England 44 492 874855 France 33 1 69411617 Singapore 65 2716331 Japan 81 3 32372831 Exabyte contract customers can obtain information about products media publications spare parts repair service and marketing information A complete support package is designed for each contract customer Contact your account manager Note All inquiries or problems for contract customers are handled by their account managers Anyone can quickly obtain product data media cleaning cartridges publications spare parts and repair service for any Exabyte product EXB 8205 and EXB 8505 Call Exabyte Direct Sales at 1 800 EXATAPE 1 800 392 8273 303 442 4333 Fax 303 447 7689 Call Exabyte Direct Service at 1 800 447 3920 303 442 4333 Fax RMA return materials authorization requests to 803 447 7199 Standard and XL 510505 Anyone can obtain technical support from the corporate or regional Technical Support offices Personalized assistance from Technical Support engineers includes integratio
103. ock size is set to 1 536 bytes the following occurs during a multiple block write operation The first physical block written to tape contains 1 024 bytes of data from the host The second physical block written to tape contains only 512 bytes of data from the host The tape drive pads this physical block with 512 gap bytes to equal the required 1 024 bytes The third physical block written to tape contains 1 024 bytes of data from the host El The fourth physical block contains 512 bytes of host data and 512 gap bytes The pattern is repeated until all of the logical blocks are written Because the block size 1 536 bytes is not an exact multiple of 1 024 tape capacity is reduced by the addition of gap bytes In this case approximately one fourth of the available tape capacity is wasted EXB 8205 and EXB 8505 8 3 Standard and XL 8 Optimizing the Performance of Your Tape Drive Logical Block Packing All Other Data Formats The maximum amount of data that can be placed in a physical block to be written to tape in all tape drive data formats is 1 024 bytes However unlike a physical block of data in 8200 format a physical block of data in all other formats 8200c 8500 and 8500c can contain one or more logical blocks of data from the host For example if a logical block from the host is 512 bytes the tape drive places two of the 512 byte blocks in the physical block it writes to tape In each of these data formats a
104. pecifications environmental requirements safety and regulatory limits and fail modes Design verification testing DVT To verify that the product performs according to its product specifications and ANSI SCSI 2 specifications All phases of the product s functionality are tested as described in Section 3 2 The test results are available to customers to help in the integration process Process verification testing PVT To determine whether existing manufacturing processes can produce the product in high volume while meeting reliability specifications Samples of the product are pulled from inventory and subjected to stress tests that are designed to replicate a broad range of user applications and to accumulate usage hours at a high rate MTBF mean time between failures is determined and compared to specifications for the product Engineering change testing To verify that the product continues to perform according to its product specifications after engineering changes are implemented Any time an engineering change is made the product s functionality is reconfirmed Depending on the type of change any or all of the tests performed during DVT described in Section 3 2 may be conducted On going reliability testing ORT 3 2 To continually monitor the reliability of the product and determine the lifetime of its various components EXB 8205 and EXB 8505 Samples of the
105. per minute max 20 C per hour 2 F per minute max 36 F per hour Relative humidity 20 to 80 Non condensing 10 to 90 Non condensing 10 to 90 Non condensing Wet bulb 26 C 79 F max Altitude w 304 8 m to 3 048 m 1 000 ft to 10 000 ft 304 8 m to 3 048 m 1 000 ft to 10 000 ft 304 8 m to 12 192 m 1 000 ft to 40 000 ft The tape drive has not been unpacked Data cartridges are not packed with the drive The tape drive s packaging is designed to protect the drive from condensation caused by extreme temperature variations When the tape drive is moved from a cold storage environment to a warm operating environment it must acclimate in its packaging for at least 12 hours before opening to prevent serious condensation damage oO O environment for 24 hours d The tape drive has been unpacked but is not operating The data cartridge is not included The data cartridge s temperature and humidity must be allowed to stabilize in the specified ambient The maximum wet bulb temperature limits the high temperature high humidity operating range of the tape drive This wet bulb temperature limitation is due to the moisture tolerance characteristics of the media 4 14 EXB 8205 and EXB 8505 Standard and XL 510505 4 Hardware Integration Issues Air Flow and Particulate Contamination Adequate air flow must be provided through the
106. r EXB 8505XL driver no change is needed May 1994 EXB 8205 and EXB 8505 6 5 Standard and XL 6 Software Integration Issues 6 3 Adding XL Support to a Half High Driver If you already have a driver for a half high tape drive and would like to add support for the XL version there are just a few issues you need to consider These issues described in Table 6 3 primarily involve accommodating the longer tape length 160m supported by the XL tape drives Table 6 3 Adding XL support to a half high driver New value for Medium Type in the MODE SENSE command In the MODE SENSE Parameter List Header a new value has been added for Medium Type byte 01 to represent the 160m XL tape This value is 86h Your driver must accept this new value from the tape drive Higher value for Number of Blocks in the MODE SENSE command In the MODE SENSE Block Descriptor the value returned by the tape drive for Number of Blocks bytes 01 through 03 will be higher when a 160m XL tape is loaded than when the other supported tape lengths are loaded The value for the 160m XL tape is 68E68Bh Higher values for Remaining Tape in the REQUEST SENSE data In the extended sense bytes the values returned by the tape drive for Remaining Tape bytes 23 through 25 will be higher when a 160m XL tape is loaded than when the other supported tape lengths are loaded If your driver monitors this value to provide gas gauge indicators to the user
107. r block Ensure that the remote switch is no more than 12 inches 30 5 cm from the jumper block Change the settings on the remote switch to the correct address for your configuration The switch settings should emulate the jumper positions shown in Figure 4 8 May 1994 EXB 8205 and EXB 8505 4 13 Standard and XL 4 Hardware Integration Issues 4 5 Environmental Considerations When integrated into a host system a half high tape drive operates best within a certain range of environmental conditions The tape drive s operating environment has a significant effect on the life of the tapes used in the drive This section describes the recommended limits for temperature and humidity airflow and particulate contamination and shock and vibration Temperature and Humidity Once a tape drive is installed in a host system and placed in its operating environment temperature and humidity must be maintained within the limits shown in Table 4 1 For reference storage non operation and transportation limits are provided Table 4 1 Environmental specifications Temperature range measured at tape path 5 C to 40 C 41 F to 104 F 40 C to 60 C 40 F to 140 F 40 C to 60 C 40 F to 140 F Temperature variation 1 C per minute max 10 C per hour 2 F per minute max 18 F per hour 1 C per minute max 20 C per hour 2 F per minute max 36 F per hour 1 C
108. rations the starting and stopping of tape motion buffer tape data transfers The minimum amount of data that must be in the tape drive s buffer before tape motion starts and data is written to the tape The minimum amount of space that must be available in the tape drive s buffer before tape motion starts and data is read from the tape During streaming operations the disconnects and reconnects between the tape drive and the host host buffer data transfers The minimum amount of space that must be available in the tape drive s buffer before the drive reconnects to the host and accepts more data The minimum amount of data that must be in the tape drive s buffer before the drive reconnects to the host and transfers more data If you feel that data transfers between a particular host and tape drive need to be fine tuned use the following rule of thumb to adjust the motion or reconnect threshold m If the data transfer rate is fast raise the reconnect threshold m If the data transfer rate is slow raise the motion threshold EXB 8205 and EXB 8505 Standard and XL 8 Optimizing the Performance of Your Tape Drive Table 8 3 indicates where you can set the motion and reconnect thresholds using the MODE SELECT command Table 8 3 Where to set the motion threshold and reconnect threshold Motion threshold Non page format Motion Threshold Byte 02 of the vendor unique parameters
109. re you use depends on whether the drive uses a single ended or a differential SCSI configuration Termination for the Single Ended Tape Drive The single ended tape drive includes three single in line package SIP resistor terminators R packs that can be left in place if the drive terminates the SCSI bus Figure 4 6 shows the location of these R packs CAUTION The R packs must be removed if the tape drive does not terminate the SCSI bus or if external SCSI bus termination is used EXB 8205 and EXB 8505 4 9 Standard and XL 4 Hardware Integration Issues SCSI Terminator R packs Figure 4 6 R packs on the back of the tape drive single ended To remove the R packs use a pair of flat nose wiring pliers to grasp each R pack in the center Pull the R pack straight out being careful not to squeeze the pliers too tightly CAUTION If you replace an R pack be sure to use the correct type to avoid damage to the tape drive Use an 8 pin 6 resistor SIP terminator rated at 220 330 ohms Exabyte recommends either of the following terminators or equivalent Dale part number CSC 08A 05 221 331J Beckman Industrial part number L08 5C221 331J When replacing the R pack make sure that pin 1 of the R pack is aligned with pin 1 of the socket and that no pins are bent As shown in Figure 4 6 the writing on the R pack should face upward Pin 1 of the R pack is marked with a colored line or dot and should line up with t
110. rive is compliant as a component to the requirements of UL standard 1950 1st Edition Information Technology Equipment Verifies that the tape drive is compliant as a component to the requirements of CSA standard 22 2 No 950 M89 Information Technology Equipment Verifies that the tape drive is compliant as a component to the requirements of EN60950 1990 and VDE 0805 05 90 3 4 EXB 8205 and EXB 8505 510505 Standard and XL 3 Product Testing 3 3 Performance at Stress Conditions Test The Performance at Stress Conditions test is designed to simulate how a tape drive is likely to operate under a wide range of conditions Tape Drives are run through a series of tests representing typical operation under varying conditions of stress The stress conditions include Margined 5V and 12V power supply lines 5 Noisy power supply Temperature and humidity extremes Thick tape and thin tape Fixed length and variable length logical block sizes Fixed and random data patterns Synchronous and asynchronous data transfers Horizontal and vertical mounting orientations Start stop and streaming data transfer modes The half high tape drive is run through a set of trials in which all of the tests described in Table 3 3 are performed During each trial one or more of the stress conditions is varied to determine how the drive is affected Table 3 3 Tests performed during the Performance at Stress Conditions test Power on S
111. rs The tape drive keeps track of tape motion hours internally You can access this information in either of the ways described below Time to Clean LED Indication When 30 tape motion hours have elapsed the top and bottom LEDs will flash rapidly and the middle LED will flash irregularly depending on SCSI bus activity For best results clean the tape drive as soon as possible after the LEDs begin flashing You may want to use the LEDs in conjunction with some type of application prompt to provide additional indication that the tape drive needs cleaning REQUEST SENSE Command You can issue a REQUEST SENSE command and look at the setting of the CLN and CLND bits byte 21 bits 4 and 3 If the CLN bit is set to 1 the tape drive needs to be cleaned This bit is reset to 0 when you perform a successful cleaning cycle The CLND bit is set to 1 when the drive has been cleaned and is reset to 0 when the next REQUEST SENSE command is received By issuing frequent REQUEST SENSE commands and monitoring this information an application program can determine exactly when cleaning is required The application can prompt the user in any number of ways when the tape drive needs to be cleaned May 1994 EXB 8205 and EXB 8505 5 3 Standard and XL 5 Half High Tape Drive Maintenance 5 3 Using an Exabyte Approved Cleaning Cartridge To clean a tape drive use only Exabyte or Exabyte approved 8mm cleaning cartridges The Exabyte 8mm C
112. rst partition to update the directory Moving From One Partition to the Other If you want to move the tape from one partition to the logical beginning of the other partition LBOP you can use the LOCATE command or the MODE SELECT command Writing Data To write data use the WRITE command as you would with a standard tape However remember that if you want to write data in the partition the tape is not currently in you must first change partitions using the LOCATE or MODE SELECT command Although partitions are treated as separate entities by the tape drive you cannot use different data formats in the two partitions If you attempt to change data formats between partitions you will lose the partition information Note however that you can turn compression on and off in 8500c format in either partition Note When you are writing data to the first partition you can never overwrite the end of the partition If you encounter the physical end of the first partition the tape drive reacts as if it encountered the physical end of the tape PEOT The write operation stops and any buffered data is not written to tape EXB 8205 and EXB 8505 8 13 Standard and XL 8 Optimizing the Performance of Your Tape Drive Locating Data Blocks Use the READ POSITION command to identify the logical position of a specific data block on a dual partition tape just as you would ona standard tape The READ POSITION data returned by the tape drive indi
113. s management of error detection data transfer retries and the data path Messages allow communication between the initiator and the tape drive during an operation Table 7 4 shows the messages that the half high tape drives support Table 7 4 Supported SCSI messages Command Complete The tape drive sends this message to indicate that it completed the command operation Extended Message Synchronous Data Transfer Request The tape drive and initiator use this message to negotiate synchronous data transfer agreements By default the tape drive does not originate synchronous data transfer requests but returns this message in response to an initiator s request However the tape drive can be configured to originate synchronous data transfer requests through an EEPROM option see Section 7 4 Save Data Pointers The tape drive may send this message before disconnecting from the bus to request that the initiator save the active data pointers Restore Pointers The tape drive sends this message to request the initiator to restore the most recently saved command data and status pointers to the active state Disconnect The tape drive sends this message to indicate that the physical path will be broken The drive will reconnect later to complete the operation Initiator Detected Error May 1994 The initiator sends this message to indicate that it has detected an error The tape drive respon
114. s maximize tape life by minimizing tape passes and store and maintain tapes for maximum shelf life and data integrity EXB 8205 and EXB 8505 510505 Standard and XL May 1994 Special Information Special information in this manual is highlighted in the following ways Note Notes provide hints or suggestions about the topic or procedure being discussed Important Text next to the heading Important provides information that will help you successfully complete a procedure or avoid additional steps in a procedure CAUTION Boxed text under the heading CAUTION provides information you must know to avoid damaging the tape drive WARNING Boxed text under the heading WARNING provides information you must know to avoid personal injury EXB 8205 and EXB 8505 Standard and XL xiii Xiv Related Publications For additional information refer to the following publications EXB 8205 EXB 8205XL EXB 8505 and EXB 8505XL 8mm Cartridge Tape Subsystems EXB 8205 and EXB 8505 8mm Cartridge Tape Subsystems Product Specification for Standard and eXtended Length Configurations 510504 EXB 8205 and EXB 8505 8mm Cartridge Tape Subsystems SCSI Reference for Standard and eXtended Length Configurations 510503 EXB 8205 and EXB 8505 8mm Cartridge Tape Subsystems Installation and Operation for Standard and eXtended Length Configurations 302967 Libraries and Enclosures EXB 210 8mm Library SCSI Re
115. s control of the bus Selection The tape drive reselects the initiator Message In The tape drive sends the Identify message to the initiator Status The tape drive returns the status of the read operation The tape drive returns the Command Complete message and Message In g disconnects May 1994 EXB 8205 and EXB 8505 7 9 Standard and XL 7 SCSI Integration 7 3 Optional Enhanced SCSI Bus Performance 7 10 Exabyte has implemented a new level of microcode for all 8mm tape drives that features optional enhanced SCSI bus performance The options described below optimize communication between the host and tape drive and reduce SCSI bus use by the drive To obtain this enhanced SCSI bus performance you must request specific settings for three EEPROM options described below when you order the tape drive from Exabyte See Section 2 4 for information about requesting EEPROM options The enhanced SCSI bus performance includes m Reduced SCSI command overhead By using commands that are part of its SCSI chip the tape drive can reduce transaction times for selection and reselection identification reception of the command descriptor block CDB and data transfers m Enhanced disconnect reconnect operations The tape drive can disconnect from the SCSI bus while processing all SCSI commands when allowed Normally the tape drive remains active on the bus while performing initial command processing and d
116. such as Tape half full you will need to modify the values your driver checks for accordingly Rewind timeout 6 6 If your driver has a maximum timeout for rewinding the tape you may need to adjust this value to account for the longer rewind time required for the 160m XL tape see page 6 3 EXB 8205 and EXB 8505 510505 Standard and XL SCSI Integration If you create a driver program for a half high tape drive you must understand how the tape drive implements the Small Computer System Interface SCSI This chapter provides an overview of SCSI communication including the SCSI commands statuses and messages supported by the drive It also discusses the following topics m Tape drive support for disconnecting from the SCSI bus m The availability of enhanced SCSI bus performance and the resulting driver integration issues Options for customizing the tape drive s SCSI configuration May 1994 EXB 8205 and EXB 8505 7 1 Standard and XL 7 SCSI Integration 7 1 Overview of SCSI Communications Table 7 1 shows the commands status information and messages that the half high tape drives support during SCSI bus phases Table 7 1 Overview of supported SCSI commands status information and messages Bus Free arbitration BSY and SEL are false The SCSI bus is idle and available for Arbitration BSY and SCSI ID assertion highest ID wins Selection Winning ID asserts SEL The initia
117. ta cartridges and using proper storage techniques you can expect a long shelf life and optimal data integrity from the tapes you use in your tape drive This chapter provides guidelines for selecting and maintaining tapes to meet the needs of reliable long term storage May 1994 EXB 8205 and EXB 8505 9 1 Standard and XL 9 Selecting and Maintaining Tapes 9 1 Selecting Data Cartridges After tape drive integration selecting data cartridges is the next step in establishing an effective data storage system By selecting appropriate 8mm data cartridges you can achieve optimum data reliability ensure tape durability and minimize wear on tape drive recording heads Data Grade Tape or Video Grade Tape The first decision in selecting 8mm data cartridges is whether to use data grade or video grade tape Exabyte strongly recommends data grade tape over video grade tape for all data storage needs Data grade tape is formulated specifically for high performance data storage It is designed to accommodate the density of data recorded by 8mm tape drives while minimizing the amount of wear inflicted on the drive s recording heads Video grade tape is designed to accommodate different densities of information and to withstand different types of handling and storage Video grade tape formulations can be less accurate when recording high density data and more abrasive to tape drive recording heads In particular Exabyte strongly discoura
118. tape drive functions when subjected to the ESD limits Discharge ESD specified in the EXB 8205 and EXB 8505 Product Specification Shock Verifies that the tape drive is still operable after being subjected to the Non operating shock levels specified in the EXB 8205 and EXB 8505 Product Specification while not operating Shock Verifies that the tape drive functions when subjected to the shock levels Operating specified in the EXB 8205 and EXB 8505 Product Specification during operation Vibration Verifies that the tape drive is still operable after being subjected to the Non operating vibration levels specified in the EXB 8205 and EXB 8505 Product Specification while not operating Vibration Verifies that the tape drive functions when subjected to the vibration Operating levels specified in the EXB 8205 and EXB 8505 Product Specification during operation Acoustic Verifies that the tape drive does not exceed the acoustic noise limits Noise specified in the EXB 8205 and EXB 8505 Product Specification EMI Electro Verifies that the tape drive functions when subjected to the limits of magnetic radiated electromagnetic energy specified in the EXB 8205 and Interference EXB 8505 Product Specification Susceptibility VDE FCC Verifies that the tape drive complies with the limits for radiated and DOC CISPR conducted electrical energy defined by these specifications ncy Approvals UL Verifies that the tape d
119. te or 4 byte as determined by the following option OFF Disconnect on any byte EBD unit size May 1994 Controls whether even byte disconnects occur on two byte or four byte boundaries This option applies only when even byte disconnects are enabled EXB 8205 and EXB 8505 4 BYTES Even byte disconnects occur on four byte boundaries 2 BYTES Even byte disconnects occur on two byte boundaries 7 13 Standard and XL 7 SCSI Integration Command queuing Controls how the tape drive handles tape motion commands during power on self test reset and load operations or when it is executing an immediate command QUEUE One tape motion command is queued until the current immediate operation is complete BUSY Commands are not queued Busy status is returned CHECK COND Commands are not queued Check Condition status is returned and the Sense Key is set to Not Ready Maximum reselection tries Controls the maximum number of times that the tape drive will attempt to reconnect to the initiator before giving up 0 No limit on the number of attempts n Stop after n attempts between 1 and 255 Reselection timeout 7 14 Controls the amount of time before the tape drive will time out during an attempt to reconnect to the initiator EXB 8205 and EXB 8505 250 msec 5 msec Standard and XL 510505 Optimizing the Performance of
120. tegration Issues for Enhanced SCSI Performance 7 12 7 4 Other SCSI Configuration Options i324 264 4046 ve68 say 49 Hawes 7 13 8 Optimizing the Performance of Your Tape Drive 8 1 8 1 Optimizing the Size of Data Blocks from the Host 8 2 Optimizing Block Size 8200 Format 44 3 4 4 6449 e3 244 b49 e4 8 3 Logical Block Packing All Other Data Formats 8 4 8 2 Fine Tuning Data Transfers ass ss bee eee eee ESR Se RR EEE 8 5 Achieving Streaming Mode s i540 464 849 44405 4954 fareni 8 6 Adjusting the Motion and Reconnect Thresholds 8 7 vi EXB 8205 and EXB 8505 510505 Standard and XL 8 3 Effectively Managing Data on the Tape lt 0 0 ses 4 ewe he ee 8 9 Compressing Data sirs obi seot oe Dee ee OE Ce ee HS 8 9 Using Partitions lt s ssa 4 0 44880 6468 e ee ehS Le RESEEAY ESR 8 12 Apperiding Data to a Previously Written Tape 9s 36s ne ie Ys oe He we 8 15 High Speed Search Using the SPACE Command i 224 4ey40 44 8 16 High Speed Search Using the READ POSITION and LOCATE Commands 2464 a e e e e pea eRe eee eae Sep ee eae sees 8 17 Obtaining Status Information Using the REQUEST SENSE LOG SELECT and LOG SENSE Commands 0 0004 8 18 9 Selecting and Maintaining Tapes 9 1 9 1 Selecting Data Cartridges ic 2 is oe REE a ae oa nae E Ee SHE HE SR 9 2 Data Grade Tape or Video Grade Tape 2 6 seed ee eee ees 9 2 What Type ot Data Grade
121. to secure the tape drive It is highly recommended that you use the four holes from only one set A B or C as shown in Figures 4 1 and 4 2 Combinations of mounting holes from different sets may lead to distortion of the frame m Objects such as screw heads cables or adjacent devices must not press against the tape drive The ventilation slots at the sides and top of the tape drive must be free of obstruction so that adequate airflow is provided There must be sufficient space to access the front panel and operate the unload button Refer to the EXB 8205 and EXB 8505 Product Specification for detailed information about the dimensions of the drive spacing of the mounting holes and required screw sizes May 1994 EXB 8205 and EXB 8505 4 3 Standard and XL 4 Hardware Integration Issues 4 2 Half High Tape Drive Enclosures If you plan to create an enclosure for a half high tape drive it must be designed to maintain the tape path temperature within the limits indicated in the EXB 8205 and EXB 8505 Product Specification You can design your own enclosure or you can purchase the tape drive already integrated in the Exabyte Mini Tabletop 8mm Cartridge Tape Subsystem Because the Mini Tabletop Cartridge Tape Subsystem comes with its own power supply thermistor controlled fan and SCSI connectors you do not need to spend additional development time designing an enclosure and obtaining agency approval Figure 4 3 shows vertic
122. tor releases I O and BSY The tape drive sets BSY The initiator releases SEL and asserts ATN Message Out The initiator sends the Identify message and indicates whether disconnects are permitted Other messages supported during the Message Out phase but in a different bus sequence include Extended Message Synchronous Data Transfer Request Initiator Detected Error Abort Message Reject No Operation Message Parity Error Bus Device Reset Command 7 2 The tape drive switches to Command Phase The Initiator sends the Command CDB Commands supported by the tape drive include alphabetical order ERASE INQUIRY LOAD UNLOAD LOCATE LOG SELECT LOG SENSE MODE SELECT MODE SENSE PREVENT ALLOW MEDIUM REMOVAL READ READ BLOCK LIMITS READ BUFFER READ POSITION EXB 8205 and EXB 8505 Standard and XL RECEIVE DIAGNOSTIC RESULTS RELEASE UNIT REQUEST SENSE RESERVE UNIT REWIND SEND DIAGNOSTIC SPACE TEST UNIT READY VERIFY WRITE WRITE BUFFER WRITE FILEMARKS 510505 May 1994 Data In Out 7 SCSI Integration The tape drive drives the bus to one of the Data phases and sends or receives data Status The tape drive returns one byte of status information as follows Good Busy Check Condition Reservation Conflict Message In The tape drive returns one byte of message information as follows Command Complete Other messages supported during the Message In p
123. u can use the INQUIRY command to obtain information about the tape drive s firmware level the version of SCSI supported by the drive and so on 8 18 EXB 8205 and EXB 8505 510505 Standard and XL May 1994 8 Optimizing the Performance of Your Tape Drive LOG SENSE and LOG SELECT Command The tape drive maintains the following read and write error recovery counters Total number of rewrites Total number of rereads Total errors corrected Total times errors processed Total bytes processed Total unrecoverable errors You can use the LOG SENSE command to retrieve the values of these counters You can use the LOG SELECT command to specify cumulative and threshold values for these counters By using these commands together you can perform diagnostics report statistical information on read and write error recovery procedures and compare the cumulative value for any of the values to a threshold that you set Comparing values is useful if you want the tape drive to notify you when a specific threshold value for example the total number of rewrites has been reached For detailed information about using the REQUEST SENSE LOG SELECT and LOG SENSE commands refer to the EXB 8205 and EXB 8505 SCSI Reference EXB 8205 and EXB 8505 8 19 Standard and XL 8 Optimizing the Performance of Your Tape Drive Notes 8 20 EXB 8205 and EXB 8505 510505 Standard and XL Selecting and Maintaining Tapes By selecting high quality da
124. uring all information commands Table 7 6 describes the three EEPROM options associated with this enhanced SCSI bus performance Note that the default settings for these options reflect the normal SCSI bus performance you must request the non default setting for all three options to achieve the enhanced SCSI bus performance EXB 8205 and EXB 8505 510505 Standard and XL 7 SCSI Integration Table 7 6 EEPROM options for enhanced SCSI bus performance Disconnect after CDB Controls whether the tape drive disconnects after receiving the CDB for any SCSI command DISABLE The tape drive does not disconnect after receiving the CDB of an information command except MODE SELECT format partition but does disconnect after receiving a tape motion command if the command is legal ENABLE enhanced setting The tape drive disconnects after receiving the CDB Save pointers in Data phase Controls whether the tape drive sends a Save Data Pointers message when it is ready to disconnect after a data has been transferred during a Data phase SP END Send the Save Data Pointers message after all data has been transferred in the Data phase NO SP enhanced setting Do not send the Save Data Pointers message after all data has been transferred in the Data phase Status Command Complete May 1994 Controls whether the tape drive drops the BSY line quickly about 5 usec after the Command Complete message
125. vents in the rear of the tape drive to prevent the tape path temperature from exceeding specified limits However air flow within the tape drive enclosure must not force air into the tape path Particulate contamination resulting from air flow through the tape path can lead to data errors The particulate counts in the drive s ambient operating environment should not exceed the limits shown in Table 4 2 Table 4 2 Maximum particulate counts for half high tape drive operation For comparison purposes Figure 4 9 shows the particulate limits for a tape drive CTS plotted against the particulate contamination profile of a typical office Note that contamination profiles of individual areas vary Y Total Particles OR gt X CU FT 10 000 000 1 000 000 100 000 10 000 1 000 100 10 4 0 1 1 10 100 X Particle Size microns Exabyte Spec lt Typical Office Figure 4 9 Particulate specification for a half high tape drive compared to a typical office May 1994 EXB 8205 and EXB 8505 4 15 Standard and XL 4 Hardware Integration Issues 4 16 Shock Table 4 3 lists the shock specifications for the half high tape drive The operating shock levels indicate how much shock the drive can withstand while it is reading and writing data The non operating and storage shock levels indicate how much shock the drive can withstand when it is not operating After withstanding this amount of shock the
126. wing equipment is required SCSI cable SCSI cable connector External SCSI bus terminator required only if the tape drive terminates the bus in a differential SCSI configuration SCSI Cable The SCSI cable for connecting the tape drive to a host is not supplied with the drive You must provide a cable that complies with FCC Canadian DOC and VDE limits To comply with these limits the SCSI cable must be shielded when it is external to the tape drive s mounting enclosure General SCSI Cable Requirements Use a 50 conductor flat cable or 25 signal twisted pair cable A minimum conductor size of 28 AWG is recommended to minimize noise effects and ensure proper distribution of terminator power Ideally to match the cable terminators the cable should have a characteristic impedance of 122 ohms differential or 132 ohms single ended However since cables with this high an impedance are not generally available somewhat lower impedances are acceptable A characteristic impedance of 100 ohms 10 is recommended for unshielded flat or twisted pair ribbon cable A characteristic impedance greater than 90 ohms is recommended for shielded cables Note To minimize discontinuities and signal reflections ensure that cables used on the same bus have the same impedances Cable Length Requirements for Differential Configurations For differential SCSI configurations ensure that the sum of all the SCSI cable lengths does not exceed 25 0
127. wing the use of Exabyte tape drives in an expanding network environment 2 13 Figure 2 7 A hierarchical storage management model 2 15 Figure 2 8 The relationship between cost and the speed of retrieval 2 17 Hardware Integration Issues Figure 4 1 Mounting holes on the sides of the half high tape drive 4 2 Figure 4 2 Mounting holes on the bottom of the half high tape drive 4 2 Figure 4 3 Exabyte s Mini Tabletop Cartridge Tape Subsystems with the EXB 8505 installed os ss saoe dees Bee ORS Ree Swe EHS 4 4 Figure 4 4 Card placement in the EXB 8505 shown and EXB 8205 4 6 Figure 4 5 Air flow in the Mini Tabletop Cartridge Tape Subsystem 4 7 Figure 4 6 R packs on the back of the tape drive single ended 4 10 Figure 4 7 SCSI ID jumper block at the back of the tape drive 4 12 Figure 4 8 Jumper settings forthe SCSIID 004 4 13 Figure 4 9 Particulate specification for a half high tape drive compared to a typical office ss m wees oe th ER ERS OE eS ERS Bee 4 15 Figure 4 10 Location of the ground tab grounding hole and power connector onthe back Gf the tape drive sac eek ew a gesus ponia ae ow 4 19 Optimizing the Performance of Your Tape Drive Figure 8 1 Corresponding areas on an unpartitioned tape and a dual partition tape sir s oe wget eer ae ine ee eee A ea Geet ee a at 8 12 Selecting and Maintaining Tapes viii
128. write 2 5 compression 8 9 to 8 11 configurations 2 8 to 2 13 D data cartridge magazine data cartridges 160mXL 9 5 compatibility 9 2 to 9 5 conditioning 9 6 labeling 9 11 managing 9 1 to 9 16 replacing 9 15 selecting 9 2 to 9 5 storing 9 9 to 9 15 tape passes 9 7 to 9 9 write protect switch 9 12 9 14 to 9 15 May 1994 Index data formats 2 5 to 2 6 design verification testing 3 2 to 3 6 disconnecting from SCSI bus 7 9 DVT 3 2 to 3 6 E EEPROM options 2 7 7 10 to 7 14 electromagnetic compatibility 4 21 electrostatic discharge 4 20 EMC 421 enclosures for tape drives 4 4 to 4 7 engineering verification testing 3 2 environmental requirements 4 14 to 4 17 ERASE command 7 4 8 14 error information 8 18 to 8 19 ESD 4 20 EVT 3 2 Exabyte 8mm Cleaning Cartridge 5 4 to 5 5 9 15 Exabyte 8mm Data Cartridge Magazine 9 14 to 9 15 EXAPAK 9 15 EXATAPE 160m XL 8mm Data Cartridge 9 5 EXATAPE 8mm Data Cartridge 9 3 to 9 5 9 15 eXtended Length XL tape drives See XL tape drives F features 2 1 to 2 18 formats data 2 5 to 2 6 formatting partitions 8 13 G grounding 4 18 H hardware integration 4 1 to 4 22 help how to get 1 1 to 1 4 hierarchical storage management 2 14 to 2 17 high speed search 8 16 to 8 17 HSM See hierarchical storage management humidity requirements 4 14 EXB 8205 and EXB 8505 l 1 Standard and XL Index INQUIRY command 7 4 8 18 installation enclosures 44to4 7 mou

EXB-8205/XL and EXB-8505/XL Integration and Optimization

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