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HP G3 User's Manual

1. BDPF ADPF Serial Number Status Location WWN Partition 18002383001 Varied On Acti 1 1 1 1 4 1 150014380 02303001 1705 8002383007 Varied On 1131211 Jb LTO5 8002383000 Varied On 50014380 0239300 105 8002383013 Varied On 1114 11 50014380 02353013 LTOS Y 8002383019 Varied On Acti 1 1 1 5 1 1 50014380 023b3019 LTO6 basic FO L 80023B301F Varied On 50014380 023b301f LTO6 basic FO v 8002383025 Varied On 50014380 02303025 6 basic v 18002383028 Varied On 111 811 50014380 023b302b 6 v 8002383031 Varied On Acti 1 1 1 9 1 1 50014380 023b3031 LTO6 APFO v 8002383037 Varied On 1 1 1 10 1 1 50014380 023b3037 LTO6 APFO v 800238303D Varied On 1 1 1 11 1 1 50014380 023b303d LTO6_APFO 1 8002383043 Varied On MERAS 50014380 023b3043 LTO6_APFO EN 5 Wait for the configuration change to complete Verifying data path failover To verify that basic data path failover is configured navigate to Monitor BDrives to launch the Drive Status dialog When basic data path failover is enabled for a drive e Link Status for one of the ports is listed as Active Link Status for the second drive is listed as Passive meaning that this is the failover port e Data Path Failover column displays Enabled When advanced data path failover is
2. n Te a nb uinea 48 Commands for viewing tape and library devices connected to a 48 Finding the lockdown AU neuen dau 51 Troubleshooting advanced path 2 Enabling or disabling advanced palli TalloVer n rr ERO E CER Seo iie b erar i 51 11 Troubleshooting tailover 53 locating a failed dort RINT 53 Windows debugging logs and 1odlsx cicnnctisidcn oe 54 Confirming failover 54 Windows systern E E etate Ea 55 Diagnesie bo aeree REI eiae bre ud 56 e c P 56 MMC m tennis 57 TT 61 61 Driver debug dump SEU esent in deitate dtes Ede mida Ute ma m POmde iba names
3. StoreEver Tape Libraries Failover User Guide HP Part Number 5697 3519 Published December 2014 Edition Fourth Copyright 2014 Hewlett Packard Development Company L P Confidential computer software Valid license from HP required for possession use or copying Consistent with FAR 12 211 and 12 212 Commercial Computer Software Computer Software Documentation and Technical Data for Commercial Items are licensed to the U S Government under vendor s standard commercial license The information contained herein is subject to change without notice The only warranties for HP products and services are set forth in the express warranty statements accompanying such products and services Nothing herein should be construed as constituting an additional warranty HP shall not be liable for technical or editorial errors or omissions contained herein Acknowledgements Intel Itanium Pentium Intel Inside and the Intel Inside logo are trademarks or registered trademarks of Intel Corporation or its subsidiaries in the United States and other countries Microsoft Microsoft Excel Windows Windows XP and Windows NT are U S registered trademarks of Microsoft Corporation UNIX is a registered trademark of The Open Group Contents saat ah a ee et eee 6 Traditional library control path and drive connections without 7 Basic path dello ef orrasees ceases eode taraia de e Ex manatee weed ein D M
4. Lun H W Path Driver S W State H W Type Health Description autoch 18 64000 0xfa00 0x12 0 0 0 9 0 0 1 0 0 0 9 0 0 1 0 0 0 9 0 0 1 0 0 0 9 0 0 1 0 0 0 9 0 0 0 0 0 0 9 0 0 0 0 0 0 9 0 0 0 0 0 0 9 0 0 0 eschgr 0x50014382c6e4f002 0x50014382c6e4f003 0x50014382c6e4f009 0x50014382c6e4f008 0x50014382c6e4f003 0x50014382c6e4f009 0x50014382c6e4f008 0x50014382c6e4f002 CLAIMED 0x1000000000000 0x1000000000000 0x1000000000000 0x1000000000000 0x1000000000000 0x1000000000000 0x1000000000000 0x1000000000000 DEVICE ga lt P PM 25 e lt dev rchgr autoch18 lt Device special file for limited ESL G3 Series Passive control path Passive control path Active control path Active control path Passive control path Active control path Active control path Passive control path media changer The reported LUN hardware path has three parts separated by a period For example in the path 0 0 0 9 0 0 0 0x50014382c6e4f002 0x1000000000000 Part 1 Part 2 Part 3 e Part 1 Hardware path for the HBA In this example 0 0 0 9 0 0 0 e Part 2 Target port WWN In this example 0x50014382c6e4 002 This is the WWN that is displayed in the library web interface e Part 3 LUN identifier In this example 0x1000000000000 Installing and using HP UX advanced path failover drivers Similarly to find the special files for tape drives use ioscan knNfC tape to list the tape
5. b Select the Advanced Failover Drivers entry and then click Uninstall Change c Follow the provided prompts to complete the driver removal Reboot the server 3 Download the latest Advanced Failover Drivers for Windows Server 2012 from the HP website Navigate to http www hp com support storage Click Tape Storage Click Enterprise Class Tape Libraries for ESL G3 or Tape Libraries for MSL6480 Click HP StoreEver ESL G3 Tape Libraries for ESL G3 HP StoreEver MSL6480 Tape Library for MSL6480 In the Download options tab click Drivers software amp firmware For the ESL C3 select your product In the Operating System drop down select OS Independent Click Driver Storage Tape Click Obtain software for the High Availability Failover Driver for your operating system Click Receive for Free Follow the prompts to download the driver package N SS SO 4 Double click the installer for your operating system to install the Tape Upper Bus Storage Filter driver 5 Restart when requested 6 After the system restarts the installer will continue installing the Tape Multi Path Intermediate Class driver The current implementation is failure tolerant only and not intended to fix unstable SAN environments Symptom Device connectivity lost after several closely spaced path failures If several closely spaced path failures occur on all of the available paths the operating system might
6. interactive troubleshooting tool www docs hp com documentation about HP products www hp com support tapetools HP Library amp Tape Tools diagnostic software The Fibre Channel specifications including the specifications for NPIV are maintained by the INCITS T11 Committee See http www tll org Copies of the Fibre Channel specifications are available from the INCITS store See hitp www incits org Typographic conventions Table 10 Document conventions Convention Element Blue text Table 10 page 67 Cross reference links and e mail addresses Blue underlined text www hp com Website addresses Bold text Keys that are pressed Text entered into a GUI element such as a box e GUI elements that are clicked or selected such as menu and list items buttons tabs and check boxes Italic text Text emphasis HP technical support 67 Table 10 Document conventions continued Convention Element Monospace text File and directory names e System output e Code e Commands their arguments and argument values Monospace italic text Code variables e Command variables Monospace bold text Emphasized monospace text A WARNING _ Indicates that failure to follow directions could result in bodily harm or death b CAUTION Indicates that failure to follow directions could result in damage to equipment or dota IMPORTANT Provides clarifying in
7. Basic and advanced data path failover can be used with the drive ports configured in loop mode or fabric mode For best results and compatibility with basic control path failover HP recommends that the drive ports be configured in fabric mode and connected to an FC switch Enabling data path failover Data path failover is configured with the Expert Partition Wizard From the Configuration area click Expert Wizard in the Partitions menu to start the wizard Select the type of data path failover for each tape drive in the partition from the Select Data Path Failover Settings screen For example Figure 9 page 29 shows advanced data path failover enabled for drives 1 and 2 In this case Advanced DPF was pre set by the wizard because Advanced CPF is configured for the partition Because a partition cannot use a mixture of basic and advanced failover the wizard will not allow Basic DPF to be selected in this case Figure 9 Enabling data path failover Select Data Path Failover Settings Select Data Path Failover Settings for each drive Drive Gen None Basic DPF Drive 1 6 Drive 2 6 Lj Advanced DPF I lt I lt Configuring data path failover 29 Verifying data path failover After data path failover is enabled l Navigate to the Status gt Drive Status screen expanding the section for the drive to see the details 2 Expand the section for each drive to see the details The Data Path Failove
8. Connected Primary Active Enabled 50014380 023b301f 5001438002303020 5001438002303021 Active A Passe O Online O Good J3KW KRS321L5 1 1 1 6 1 1 HU1232PMGB 1800238301 Conneded Secondary Enabled LTO6 FC 50014380 023b3025 5001438002303026 5001438002303027 Q Active Passive Online O Good J3KW KROS66L6 1 1 1 7 1 1 HU1232PMNP 8002383025 HP Connected None Enabled 50014380 023b302b 500143800230302 5001438002303020 Active Active Online Good J3KW BOIO17LS 1 1 1 8 1 1 HU1232PMHE 8002383028 HP Conneded Secondary Enabled LTO6 FC 50014380 02303031 5001438002303032 5001438002303033 Active Active O Online Good J3KW KRO0507L6 1 HU1232PMLG Conneded Primary Active Enabled ros 500143800233038 5001438002353039 O Active O Online O Good U3KW KR5824L5 1 UT 37 HP Conneded None _ Enabled LT 143800239303 23b O Active Online Good J3KW KROS16L6 HP Conneded None Enabled LTO6 5001438002303044 5001438002303045 O Active Online Good J3KW KR5339L5 Fue 8002383043 Conneded None Disabled Le i gt Help ll To verify that basic or advanced data path failover is working 1 From the Fibre Channel switch s management console down the main Fibre Channel port to a drive 2 From host computers confirm that the drive is still accessible After confirming that the drive i
9. Select the partitions and ports you want to configure for host access Partition Robot Device Legend gt Access Added Access Removed Access Changed No Change Select All Serial Status PortA PortB 1 12031000103 LLO Online w LI SAN configuration When basic control path failover is enabled the library is no longer presented as a logical unit behind the tape drive and is assigned a new Fibre Channel node name which needs to be zoned in the same zone as the primary and secondary CP drives For additional SAN requirements see Preparing the switches and hosts for failover page 18 After configuring the basic control path failover parameters you might need to make additional changes e find the world wide name assigned to the library controller use the Monitor Partitions menu to see the Partitions Status dialog The world wide name for the library controller is shown in the LCP WWPN column 10 Partitions Status Name Status Media e Interface Drives Slots in UE Slots Barcode Restrictions Media Identifier Drive Autolevel Auto Drive Clean ptio PWWPN 1 Online LTO Mixed Mixed 3 Full Restrictions Pass Through Disabled Enabled Managed UNL NICNN e connecting to library may need to be rebooted if operating system does support dynamic de
10. saved For additional information see the HP UX man pages scsimgr 1M ioscan 1M mknod 2 mksf 1M rmsf 1M Troubleshooting advanced path failover Advanced path failover errors are logged in the var adm syslog syslog 1og file as part of the default SCSI I O tracing function of HP UX You can use standard file viewing commands including cat vi dmesg and tail f to view the syslog log file Enabling or disabling advanced path failover Advanced path failover is disabled by default When advanced path failover is disabled the driver operates as if the device is not capable of using the advanced path failover feature When advanced failover is enabled for the library or tape drive the device resets itself and must be opened using the device special file before the driver will recognise it as an advanced path failover device and use the failover features of the driver Opening the device is generally done by the host applications You can enable or disable advanced path failover using the library web based interface For instructions see e Enabling control path failover for the ESL G3 24 Enabling data path failover for the MSL6480 page 29 When advanced path failover is disabled the passive control paths to the library will go into an error state NO HW in the ioscan 1M command output These stale entries do not affect the function of the library To clear this errors so the device can be ac
11. If no failover connection is available the connection that has been idle for the longest time is closed and then the new connection is created The server connected to the terminated idle session is notified that the failover connection has been terminated and the advanced path failover driver on that system will automatically create a new connection the next time a command is sent to the device NOTE Systems using advanced path failover should be designed with 32 or fewer active hosts per device for optimal performance Hosts should be configured so that they do not send unnecessary polling commands to the device Opening a connection to a library control path 12 In a system configured for advanced failover at least two tape drives should be configured to provide a path to the library controller For additional redundancy the ESL library allows configuring more than one standby control path drive Some library state information is retained in the drive hosting the library controller so each server that requests a connection to the library controller is required to create a connection using a path through the same hosting drive The library controller provides a method for the administrator to select the preferred control path drive The advanced path failover driver will query each available control path drive to determine the preferred control path drive called the active control path drive before requesting a connecti
12. the problem as soon as possible To locate and correct path failures Locating a failed path 53 l Examine library event or RAS ticket indicating that failover has occurred The Serial is that of the tape drive with the failed path and the tape drive coordinates indicate the physical location of the drive See information about Tape Drive Location Coordinates in the library user guide 2 Use host utilities to confirm the failure e On Windows use the diagnostic application 1 Launch the application or if it is already running go to Actions Refresh Cached Driver Data F5 2 In the Devices pane locate the drive whose serial number matches that from the support ticket Select the device 3 In the Paths pane confirm that not all of the ports are available e command line user interface page 44 e HP UX commands for viewing tape and library devices page 48 3 Locate the failed connection or SAN component a Using the location coordinates of the drive locate the drive and examine the two Status LEDs labeled Port 1 and Port 2 If either of those LEDs is off the port with the unlit LED is the failed link b the status LEDs are both lit and the library is connected to an external switch use the Fibre Channel switch management feature to locate ports that are not functioning c Examine the Fibre Channel host bus adapters in the host If one has a light that indicates a malfunction tha
13. 16 preparing for advanced path failover 16 reviewing design guidelines 16 Subscriber s Choice HP 68 symbols in text 68 tape drive sense codes 65 technical support HP 67 service locator website 67 text symbols 68 troubleshooting 53 library path failover events 62 Linux cached reservation information 61 Linux debug output control 62 Linux path rotation exercise function 46 Linux trace log 62 locating a failed path 53 Windows diagnostic application 56 Windows diagnostic dumps 61 Windows driver debug dump setup 66 Windows logs and tools 54 V verifying control path failover ESL C3 26 MSL2024 MSL4048 MSL8048 MSL8096 34 MSL6480 28 verifying data path failover ESL G3 21 MSL2024 MSL4048 MSL8048 MSL8096 31 MSL6480 30 W websites HP 67 HP Subscriber s Choice for Business 68 Windows confirming failover operation 54 downloading advanced path failover drivers 36 driver debug dump setup 66 driver theory of operation 37 installing advanced path failover drivers 35 uninstalling advanced path failover drivers 37 Windows diagnostic application 56 Windows diagnostic dumps 61 Windows system log 55 75
14. 4 tape drive paths two each on 2 drives and 4 media changer paths to one media changer The failover drivers have one path to each of the two tape drives through Switch A The failover drivers also have one path to each of the two tape drives through Switch B Each of those four paths can potentially connect to either the tape drive or the tape library At boot time the drivers discover a total of eight potential paths to devices This results in the Windows Device Manager view that is shown in Figure 18 page 42 The failover paths appear under System devices A virtual bus named AdvFO Tape Multi Path Intermediate Class Driver ROOT FDO is created to enumerate the multi path capable devices Each of the eight paths appears as AdvFO Tape Multi Path Intermediate Class Driver SCSI FDO The drivers make one path active to each tape drive and one path to the tape library active through the drive hosting the active control paths Each physical device appears once in the Device Manager Under Tape drives there are two instances of Hewlett Packard LTO Ultrium 6 drive and under Medium Changer devices there is one instance of HP ESL G3 Tape Library NOTE number of devices have been removed from this view to improve readability Windows driver theory of operation 4 Figure 18 Device manager window 3 a UGE EE 8 8 E Device Manager j Comp
15. Channel port on both the active control path drive and the standby control path drive Additional prerequisites for advanced data path failover e Only LTO 6 Fibre Channel tape drives support advanced data path failover e Host drivers need to be configured on all hosts The hosts that do not have advanced path failover drivers will see the drives but will not be able to write read or send move commands The advanced path failure drivers also support drives configured with basic path failover or without failover configured e f Secure Manager is enabled hosts that need access to the control path must be given robotics device access to all Fibre Channel ports on both the active control path drive and the standby control path drive The host will have two different worldwide names for the two different HBAs and each worldwide name may be granted access to all ports or one name may be granted access to the first Fibre Channel port and the second name may be granted access to the second Fibre Channel port NOTE For increased fault tolerance select two drives that have less common library infrastructure for the active and passive control path drives For example if you choose drive 1 as the active drive choose a passive drive in another cluster or library module Enabling data path failover To enable data path failover 1 log into the Management Console as a user with Administrator privileges 2 Select the Physical managed v
16. Drive 1 LUN Data Path Failover Enabled Port A Configuration Speed Port Type Addressing Mode ALPA Port B Configuration Speed Port Type Addressing Mode ALPA Drive 2 Data Path Failover Enabled Port A Configuration Speed Port Type Addressing Mode ALPA Port B Configuration Speed Port Type Addressing Mode Drive Configuration ECLICHEICZNELICZLILLINECIIN EILCINASNEEIONEILI V Power Note Read the Help page for more information before checking this option Automatic v Fabric v x01 Automatic v Fabric v x01 V Power On Note Read the Help page for more information before checking this option Automatic v Fabric NF v x01 Automatic v Fabric NF x01 Refresh Submit Verifying data path port failover After data path port failover is enabled verify the configuration in the Drive Status screen as shown in Figure page 32 Configuring data path port failover 3l Figure 11 Standby and active ports Drive 2 Status At 12 29 51 Library Time Status Ready Cartridge In Drive None Media Removal Allowed Drive Error Code No Error Internal Drive Temperature 38 0 C normal range 15 C 68 C Cooling Fan Active Drive Activity Ready Encryption tion off Port A Status Login complete Speed 8 Gb s Port Type Fabric N F N Port ID 011800 ort B Status Standby After verif
17. If the device is a candidate for failover the driver determines the serial number SN or worldwide name WWN of the device IF the device is capable of advanced path failover the driver determines whether failover is enabled for the device If the device does support failover and failover is enabled then the driver will mask all duplicate paths and present a single path to application clients If the device does not support failover if failover is not enabled or if an error occurred while attempting to determine the failover enabled state then the driver will not modify the presentation of paths to the device to applications Driver components Windows advanced path failover drivers consists of two drivers a storage bus filter driver and an intermediate class driver The storage bus filter driver processes OS device notifications PnP notifications to identify available paths to tape and media changer devices capable of supporting advanced path failover The intermediate class driver works with the devices that have been identified as advanced path failover capable devices and manages the active paths to the changer and tape drives This architecture follows the architecture of Microsoft s MPIO MPIO only supports disk devices and cannot be used directly Windows driver theory of operation 37 Figure 15 page 38 shows the organization of the Windows drivers and system components when an Emulex LPe 12002 host bus adapter is install
18. Most recent firmware versions have NPIV enabled by default but it is configured per port and could have been disabled Verify that NPIV is enabled For best reliability use firmware revisions v6 2 2f v6 3 2d v6 4 3e v71 1c or newer depending on the switch family See the Design Guide for Backup and Archive for current supported revisions at www hp com go ebs Preparing the switches and hosts for failover To enable NPIV on a switch navigate to port administration and execute an advance view Cisco switches Some Cisco switches that support NPIV do not have NPIV enabled by default The Cisco MDS 9148 may disable NPIV when power cycled To enable NPIV on a Cisco switch use Cisco Device Manager gt Admin gt Feature Control or use the Cisco commands show NPIV status and NPIV enable Hardware specific requirements for advanced path failover The NPIV settings are not needed for advanced path failover For supported switch firmware versions see the Design Guide for Backup and Archive on the HP website at http www hp com go ebs B Series switches For best reliability use revision v7 1 1c or newer LTO 5 and later drives work best with 8G connections configured with arb ff type 3 which is done by using the portcfgfillword command to set the ports to use fill word type 3 The fill word for 4G connections should be set to idle C Series switches For best reliability use minimum revision 5 2 8 H Se
19. and using HP UX advanced path failover drivers Example 2 Using ioscan 1M to view tape devices d ioscan knNfC tape I H W Path Driver S W State H W Type Description 18 20 64000 0xfa00 0xd dev rtape tapel8 BEST 64000 0xfa00 0xf dev rtape tape20 BEST estape estape CLAIMED DEVICE dev rtape tapel8 BESTb CLAIMED DEVICE dev rtape tape20 BESTb Example 3 Using ioscan 1M to view library devices S W State H W Type HP Ultrium 6 SCSI dev rtape tapel8 BESTn dev rtape tapel8 BESTnb HP Ultrium 6 SCSI dev rtape tape20 BESTn dev rtape tape20 BESTnb Description ioscan knNfC autoch Class I H W Path Driver autoch 18 64000 0xfa00 0x12 eschgr autoch 19 64000 0 00 0 13 eschgr autoch 20 64000 0xfa00 0x14 eschgr autoch 30 64000 0xfa00 0x3e eschgr CLAIMED DEVICE CLAIMED DEVICE CLAIMED DEVICE CLAIMED DEVICE HP ESL G3 Series dev rchgr autoch18 HP ESL G3 Series dev rchgr autoch19 HP ESL G3 Series dev rchgr autoch20 HP MSL6000 Series dev rchgr autoch30 Commands for viewing tape and library devices connected to a system 49 50 Example 4 Finding HP UX paths for drives listed on the library interface This example shows how the drive and port information displayed in the ESL G3 library web interface can be seen from the HP UX host On the Control Path CP Selection screen for a partition the drive with serial number 82 6 4 007 is the drive with the control path fo
20. attempting to read write the tape drive or move media using the changer 2 In rare cases when all paths to a tape drive are lost while commands are in progress it is possible for this error to be reported once when the connection is next opened Closing the device and retrying the connection will clear this condition Additional tape drive sense codes 65 12 Advanced troubleshooting techniques The techniques in this chapter assume an advanced level of experience Windows driver debug dump setup Generating a driver debug dump log file requires installing checked drivers and the DebugView application Drivers with debug capability are available from HP technical support http www hp com support 1 2 7 8 9 Uninstall the release drivers as explained in Uninstalling drivers page 37 In Windows 2008 or 2012 systems place the system in Test Mode by opening a command window and entering the command bcdedit testsigning on and then restarting After restarting the desktop will display Test Mode in the lower right If this step is not done then after installing a checked driver the system will boot into Recovery Mode If the bcdedit command is not recognized it is not required for that system For further details see http msdn microsoft com en us library windows hardware 1155348A4 v2vs 85 aspx Configure the location and type of the debug output to save a kernel dump in a known location A k
21. been verified use the library front panel or the library management interface to power off the drive marked as hosting the library logical unit number Drive 1 LUN in Figure 12 page 33 Configure Drives After the library has powered off the drive hosting the library control path the LUN indicator should move to the alternate control path drive When the library has reported that the drive has been successtully powered off and the LUN indicator has moved to the alternate control path drive verity that host connectivity to the library has not changed It may be necessary to configure switch zoning to allow host access After verifying library connectivity using each of the library control paths the library control path may be moved back to the original drive if so desired by using the Alternate Drive for Library Control Path option see Figure 14 page 34 34 Configuring failover for other HP StoreEver MSL Tape Libraries 8 Installing and using Windows advanced path failover drivers After the host has been configured and booted install both the HP tape and the HP changer drivers Both the HP tape and the HP changer drivers must be installed before the advanced path failover drivers are installed The tape and changer drivers are in the HP StoreEver Tape Drivers for Windows driver bundle available from http www hp com storage tapecompatibility After installation of the tape and changer drivers use Windows Device Manager to confirm
22. communicates with the drivers to obtain the state of failover sessions The diagnostic application is installed with the driver and can be found in the driver installation directory C Program Files Hewlett Packard Advanced Failover Drivers Utils or C Program Files x86 Hewlett Packard Advanced Failover Drivers HPAdvFoDgn The application consists of two files HPAdvFoDgn exe and HPtapeFailover mpio dll Operation 56 The diagnostic application is started by double clicking its icon It displays a windows like the window shown in Figure 19 page 56 The window contains four panes Figure 19 Advanced failover diagnostic application f Advanced Failover Diagnostics Changer 2032370095 11 0000000 0 ER G3 Series 665 8206045013 137902 78 1 He Urim 6 551 new Tapes 8206045000 56401842 1 Uttrium 6 SCSI restricted None ak urcesricted CD6 12 00 00 00 FC 00 00 00 00 00 00 00 00 00 00 00 Cached Sense Nore egacy Reservations Set 0 NOIV 0 Protocol ID 0 Port ID 0 Initiator ID 00000000 00000000 Sterk Reservations PRiGener ation 0 Set 0 A 0 evert Removal Seo _ cove L9 The Devices pane lists the tape drives and media changers that are associated with the path failover drivers This panel lists all devices that are capable of supporting advanced path failover regardless of whether they are configured to use advanced path fail
23. configure per machine MSI package e Error 0x80070643 Failed to configure per machine MSI package If these errors appear download the Windows Installer appropriate for your version of Windows using the following link http www microsoft com en us download details aspx id28483 The installation process creates a directory C Program Files Hewlett Packard Failover 3 If the server doesn t already have the HP StoreEver Tape Drivers for Windows you can obtain the driver package from the Driver Storage Tape page as described in Step 1 and then run the installer file as Administrator to install the drivers Uninstalling drivers To remove the drivers l Select Start2Programs Control Panel 2 Select Advanced Failover Drivers entry click Uninstall Change 3 Follow the provided prompts to complete the driver removal Windows driver theory of operation The advanced path failover drivers support data path failover and control path failover on HP LTO 6 drives integrated into HP tape libraries A failover device driver must identify devices accessible over the different paths available and associate paths with devices so that it is able to mask duplicate paths and present a single path to an ISV application As devices are discovered by the operating system and the DEVICE OBJECT is passed into the driver for initialization the driver determines if the device is a tape or changer device and is a candidate for failover
24. drives and then use ioscan m lun H H W path gt to see information for the drive For example if the LUN hardware path to the tape drive is 64000 0x a00 0x37 d ioscan m lun H 64000 0xfa00 0x37 Class I Lun H W Path Driver S W State H W Type Health Description tape 29 64000 0xfa00 0x37 estape CLAIMED DEVICE online HP Ultrium 6 SCSI 0 0 0 9 0 0 1 0x50014382c6e4f009 0x0 Tape device special file 0 0 0 9 0 0 1 0x50014382c6e4f008 0x0 Tape device special file 0 0 0 9 0 0 0 0x50014382c6e4 009 0x0 Tape device special file 0 0 0 9 0 0 0 0x50014382c6e4 008 0x0 Tape device special file dev rtape tape29 BEST dev rtape tape29 BESTb dev rtape tape29 BESTn dev rtape tape29 BESTnb Tape device special files Finding the lockdown path The load balance policy used to route data on multiple paths to a tape drive or library is called the path lockdown policy Use the scsimgr get info command to see the current lockdown path for a library For example 4 scsimgr get info D dev rchgr autoch35 STATUS INFORMATION FOR LUN dev rchgr autoch38 LUN Path used when policy is path lockdown 0 0 0 9 0 0 1 0x50014382c6e4 009 0x1000000000000 Use scsimgr get attr command to see the current lockdown path for a library For example 4 scsimgr get attr D dev rtape tape28 BEST SCSI ATTRIBUTES FOR LUN dev rtape tape28 BEST name lpt lockdown current 0 0 0 9 0 0 0 0 100000 00222 1 0 2000000000000 default
25. library controller and a second drive configured as the passive logical link to the library controller The library connections share physical links with the drives but the library has its own identity on the SAN and will show up as a unique device Unlike the typical bridged library controller configuration shown in Typical bridged library controller connection page 7 basic control path failover uses a Fibre Channel technology called NPIV which allows the library to show up on the SAN as a new device with its own worldwide name instead of showing up as a logical unit behind the tape drive Connecting as an independent device makes it possible to change the library controller SAN connection without affecting the drive connection If basic data path port failover is also configured the library control path follows the data path on single link failures With basic control path failover the ESL G3 library monitors the drive that is hosting the library controller and the ports on the drive The library receives notification from the drive of any interface change events and can quickly detect whether that change indicates a fault The library also monitors the drive and can detect when a drive has been removed or otherwise becomes inaccessible Upon detecting a fault that would cause loss of communication with the library controller the library automatically moves the library control path identity world wide names and all settings such as reservati
26. not detect a path change and report that to the driver causing a loss of connectivity with the device Workaround Locate and repair the SAN faults The driver is not always able to recover if both the active path and the standby path have faults The current implementation of the Windows driver uses the first path to a device that was successtully found Symptom The device driver does not connect to the preferred path after a system boot or device rescan Workaround The driver n the first path in the hardware scan performed by the operating system If a particular path is preferred load the HBA for that path in the lower numbered hardware location 69 70 The driver does not perform speed or performance comparisons of all available paths to a device to select the best one as a primary Symptom The device driver does not connect to the highest performance path after a system boot or device rescan Workaround The driver prefers the first path in the hardware scan performed by the operating system If a particular path is preferred load the HBA for that path in the lower numbered hardware location In multi host environments device discovery on a newly introduced or rebooted host could be problematic if the library is not idle during the discovery Windows and Linux Symptom A host in a multi initiator environment does not discover a path to the library controller when it is booted or the devices are rescanned when another i
27. notification failure NT status 1 SCSI Status 2 Sense Key 3 ASC ASCQ 964 965 Drive Error Code 6 7 Hardware error from device on NCN Informational Nexus change notification will retry after Sense Key 1 ASC ASCQ 2 3 Unrecoverable error in failover sequence negotiation after NCN failure Sense information from a device requires a new failover session be established Informational Informational Recovery aborted sense data modified Sense Key 1 ASC ASCQ 2 3 A new session will be created after NT status 1 SCSI Status 2 Sense Key 3 ASC ASCQ 4 5 Drive Error Code 6 7 Unable to retrieve logged in host table from a tape drive Informational Retrieve logged in host name failed NT status 1 SCSI Status 2 Sense Key 3 ASC ASCQ 4 5 Drive Error Code 6 7 The reason code for a failover session establishment error is a Windows system error number Include the reason code with the rest of the message in any report sent to technical support For simplified viewing the Windows system Event Log may be filtered using the Actions panel and selecting just events from HPtapeFailover filtandHPtapeFailover Including events from UserPnp may also provide additional helpful information Windows debugging logs and tools 55 Diagnostic application The Advanced Failover Diagnostic application
28. the oldest log entries are replaced with the new log entries If O is specified as the file size the log files can become quite large and potentially fill up a hard drive When Restart is selected and OK is clicked any existing log files are closed and new files are created with updated date and time Each of the files created after a restart or reboot can grow to the specified size Before sending the log files to HP run the application open the enable logging dialog deselect Enable or select Restart and then click OK to ensure the files have been completely written to disk Diagnostic dumps There are two different diagnostic dump logs which can be saved and sent to HP for analysis The first is the standard Windows kernel dump which can be saved when a bug check blue screen occurs The other is a Driver Debug Log generated by a debug version of the advanced path failover drivers The debug version of the advanced path failover drivers is designated by a d at the end of the driver name e g hpadv oxe4d exe and will be provided by HP support if drive debug logs are required Debug logs can provide information on failover operations and whether or not a bug check has occurred Memory dump setup To configure Windows to produce a memory dump see http support microsoft com kb 254649 The configuration process includes specifying the name and location for the dump file as well as the type of the dump The type should be a k
29. 1 in 0 0 0 1 is the lun number of the device accessed by that path A drive has a LUN of O A library has a LUN of 1 The port names are not reported by the library because the library uses ports on the drives so the port names are not available in the report All of the paths show their status as being up This means that the driver believes that all of those paths are currently available for use The state of down is temporary It is only visible while the path is being destroyed Once the path becomes completely unusable the driver removes it from the list Any path that remains in a down state for more than a second should be disconnected and reconnected to reestablish a reliable connection The path cannot be disconnected via the Linux operating system disconnect the path by physically disconnecting the FC cable disabling the port in the FC switch or power cycling the drive Setting the preferred path Normally the driver attempts to use the path with the fewest number of open tape drive device files You can override the path by selecting a preferred path The preferred path is the path that the driver will attempt to use at the next open of the device file The path will not switch to the preferred path if there is any other thread holding the dev file open If multiple threads have the dev file open the driver will not interfere with the path selection that has been made by another thread The path will not change to the p
30. 21 Report Device menu item f Advanced Failover Diagnostics Actions Refresh Cached Driver Data 5 Report Device Enabled Report Local SMG 4 Session Status Glear Nexus Settings Session List Enable Logging 00000000 Windows debugging logs and tools 57 58 Table 4 Device information Menu ltem Enabled Data Reports whether advanced path failover is enabled for the SSC device server i e for the tape drive data path and for the SMC device server i e for the media changer controller path Session Status Expected FSC command indicator used for management of commands that require synchronization following a link failure PFSE The device server is using failover via this device server 0 The device server is not using failover via this device server Failover Session Key The key for the path nexus over which the driver is communicating with the device Session List Each entry in the session list contains information about one failover session Failover Session Key Initiator Worldwide Name Local SMC device server information changer has been selected in the Devices pane The Actions Report Local SMC menu is available and has three sub menu items see Table 4 page 58 which provide an interface to read state information from the selected library The information is read directly from the library and should match the information retained by the drive
31. 39 The drive configuration failed because of supporting this feature unsupported ACPF features selected 4040 Data path failover occurred Check the cabling and all network components between the affected drive and host computer 4043 Control path failover occurred This event applies _ If the failover was unplanned or unexpected verify to Advanced CPF that the host still sees both the active and passive drives If necessary reconfigure a different passive drive for the partition Check the cabling and all network components between the affected drive and host computer 4046 The drive configuration failed because of missing Disable path failover or install the necessary failover DPF license license 4047 The drive configuration failed because of missing CPF license 4048 The drive configuration failed because of Disable basic path failover for this drive or replace unsupported BDPF feature selected the drive with one supporting this feature 4049 The drive configuration failed because of unsupported BCPF feature selected 4050 Basic data path failover occurred Check cabling and all network components between the affected drive and host computer 4053 Manual control path failover from active to passive Check cabling and all network components between drive failed partition may be disconnected from affected drive and host computer host 4056 Failed to copy settings from active to passive drive The partition no longer has a passive dri
32. 9 Device manager irent vv ved pni ul t p Ue pli e URP pre n e p ap RAO Uti 40 Device cce iis eene eta VEU dl kv Nu RA orba Ranae tudin evel ta uta RA Rut cauce den 42 9 Installing and using Linux advanced path failover drivers 43 Installing advanced path failover envers eese ptt eC Ihr PUE e Ies te Pe epi deae eod 43 Updating the driver wilhibisbrebeoHh unenee pes dinuuttu duse Potete ea Dacus itai Ee Ee tete 43 WIS M NETTE TEE DOO STU 43 Commond line user ATTI CE dna vri evi Ped YE re diga onn OE RR Ob 44 Viewing the current driver revision eene eene ener rennen nenne 44 Viewing device NDS ede rebote utut ed uten ubt ne CA mp RUM qe chm pA 44 Setting the preferred polls eee oie Pau c ORE HEN 45 Path rotation exercise veces Sea god da caelos NEU PA BUR 46 Enabling advanced path failover on a device while the driver is 46 Disabling advanced path failover on a device while the driver is 46 Linux driver theory of Op ON esee mi etus Die mta a 46 10 Installing and using HP UX advanced path failover drivers 48 Installing advanced path failover drivers ssnicoiicis
33. E UD qup Map Liu LM UU 8 Basic data path port failover delallSusecuosissetci stessi pet estted etos tros dt decided Put deas muda 8 Basic control path failover detalles etcetera t Extr his HBirUrd taba drag dee D ecu tn erum 9 Technology Tor basic control path Tell OV Sy asesor eter amet eio fox tatit did Ec a ete ca Feel e tS 11 Advanced path Tey eS uice ee up epiie idera eni bes dU mta ve ebd med itti nan bU LM 11 Driver operation during device ee pem luM nrbis iva ate Ead e der ub en pa 12 Opening a connection to a library control rites 12 Driver operation during normal communicaforns uocare dk Vx ava RUE 13 Path failure nels tee tlt ily NRI tO 13 Path failure recovery icio ceri eco Ee DER D nue 13 Active and passive control path drives eene 13 library controller path failure recovery esie inerti tac tenter iae RR RUE 14 2 balie Bel M BUE desinis EEEE ppe help 19 advanced path NOVE PME T 16 Preparing Wes SAN BR ER irei e E EEEE E EAE A A E EREE 16 Minimize esc cimi sesegan is iab Qi EOE Ee pU Vid EES E EE RENES EE Ere EEEE NIESE 16 Configure redundant coDBCHOPSe ecu na Ra retire eit E Renee 16 Review the SA
34. IGIFOUIs uu 69 B Data Protector device discovery with advanced path failover 71 Ind o oM eM MM E 73 Contents 5 1 Overview 6 With today s high dependency on access to business information safe guarded data and limited backup windows the reliability of the backup hardware and software is vital Additionally backup operations are usually automated often done at night and any first pass operator intervention is done remotely To assist with these enterprise demands HP provides High Availability Failover features for ESL G3 tape libraries and the MSL2024 MSL4048 MSL6480 MSL8048 and MSL8096 Tape Libraries with LTO 5 and later generation Fibre Channel tape drives Failover features are not supported on the HP StoreEver EML and ESL E Series Tape libraries e High Availability Data Path Failover Both of the tape drive s ports are connected to the SAN Only one of the ports is used at any one time and the second port is a standby port When a link failure on the active port is detected the second port is used e High Availability Control Path Failover Depending on the library and drive one or both ports on the control path drive are configured to present a path to the library controller and a second drive is configured as a standby library control path drive The library control path can be moved to a second lin
35. K To capture driver debug messages during boot time select Capture gt Log Boot Select a file to receive the log with File Log to File or File Log to File As The help file for DebugView is comprehensive please refer to that for details If Help does not work because the right pane displays Navigation to the webpage was canceled locate the dbgview chm file in the destination folder Right click on the file select Properties and the General Tab on the lower right click Unblock 66 gt Advanced troubleshooting techniques 13 Support and other resources HP technical support Telephone numbers for worldwide technical support are listed on the HP support website www hp com support Collect the following information before calling Technical support registration number if applicable Product serial numbers Product model names and numbers Error messages Operating system type and revision level Detailed questions An Support Ticket which can be downloaded to a USB drive from the front panel downloaded to a file with the remote management interface For continuous quality improvement calls may be recorded or monitored HP websites For additional information see the following HP websites www hp com HP corporate website www hp com go storage HP storage products www hp com go ebs compatibility information www hp com support HP Support website www hp com support mslg3tstree
36. L library events related to path failover page 64 Table 6 ESL G3 events related to advanced path failover Event Library Control Path Failover Description A library control path failed and a failover operation to a redundant control path drive succeeded Library Control Path Failover Failure A library control path failed and a failover operation to a redundant control path did not succeed The library control path is not operational Drive Data Path Failover A drive data path connection failed and a failover operation to the redundant drive port succeeded Drive Data Path Failover Failure A drive data path connection failed and a failover operation to the redundant data port failed The drive data path is not operational Drive Control Communication Failure A drive communication failure occurred which prevents drive control and library control path operations Troubleshooting failover operation Table 7 MSL6480 events related to path failover Event code Message and description Details and solution 4037 Loss of redundant data path Verify that both FC ports are correctly cabled to the SAN 4038 The drive configuration failed because of Advanced path failover ADPF and ACPF are only unsupported ADPF features selected supported on 6 tape drives Disable advanced path failover for this drive or replace it with a drive 40
37. Mi iM deherepdd 61 0 MERERI TED 61 gio enced M Po P EE 61 Linux logs and troubleshooting Tools orco oon 61 4 Contents Repent cached reservation Informbitlortasuuisai eie nas tbt Pokal c iba ip E a e UM Ee Uni d pex MuR x as 61 Debug Output cantra mE obi tir omitti ce DU reu d en pere ah EUR Re bad adn VN 62 Reading Ihe trace Bg padre ded 62 Library path sna uspiM Dota Cete tutors dote 62 Additional taps drive sense n roe a 65 12 Advanced troubleshooting techniques esee 66 Windows driver debug dump setup eene rennen nnne 66 18 Suppon arid ESOULEBE aieo Ra sa Serata aa a ipM Em 67 HP technical SUpBpeltouesda mee oU et De DP ED ER RE APUD s abe td ue dt p pA E NU NE DM EAM dU 67 ul os Cc cp 67 Typographic ti da quia boast dA E e kan M Lb vU ME eats cU pK Lb 67 Subscription S Ru ER Med amete DUE 68 HP aulhorized Tesel lef p Redes sascha eps QAI OH d 68 A Known issues and Wo
38. Mode select either Basic or Advanced path failover 7 Click OK u Control Path LTOG APFO T Mats Select the Control Path drive from the Combo list shown below If the library is licensed for Basic Control Path Failover BCPF or Advanced Control Path Failover ACPF select a drive from the table below The drive will be configured for or ACPF depending on the selection that is made in the CPF Mode panel Control Path CP Selection CPF Mode CP Drive g 1 None J Basic 9 Advanced Control Path Failover CPF Selection Legend Selected Control Path Drive Unsupported CPF drive Select SerialNumber Status Location WWN Online__ 1 1 4 __ 50014380 023b302b 8002383028 8002383031 Online Acti 18002383037 Online 11 4 1 10 1 50014380 023b3037 8002383030 Online 50014380 023b303d 8002383043 Online 12 50014380 023b3043 24 Configuring failover for the HP StoreEver ESL G3 Tape libraries Configuration requirements after enabling control path failure Library configuration Secure Manager is enabled hosts that have been granted access to the control path device must be mapped to the first Fibre Channel port of the drive for basic control path failover and must be granted access to both ports for advanced path failover 7 Secure Manager Configuration Wizard xi Select the partitions for host access
39. N design mto breed Ie tu treu 16 Preparing nde B PEE E E E EN EER EREE 16 Preparing the od a E R EER E EA 17 4 Preparing the switches and hosts for 18 Hardware specific requirements for basic failover sssssssssssss es 18 inis E aria sipuantdnehave Pix mia FER Dar GRRH UE 18 Cisco or op Wr 19 Hardware specific requirements for advanced path 19 B Series SITES Dicebat tomar UU aM UNO dM um UN M EPIS 19 SWINE sas cesa iedki cux RR E UE ponte pe ed CUN c EE 19 H Series SIEGE castp spixti iie S PbcU RP ONDES MIStoU oup buptiU MM M mU uM fett 19 5 Configuring failover for the HP StoreEver ESL G3 Tape libraries 20 Configuring data path Gatti c uscite ma icdeseted esu su ulti duke 20 Enabling data path TAM OVERS xsarctecelce a eter EU Wr eS uU breite vitto M his uei tret btc deu 20 Verifying data path 21 Diagnosing basic data pathi Tallever nrbt ena rad Lotus 22 Disabling data path THll e Vos icta pei c beo R p PAD ID dM EpU UR PEDE uud
40. P HP HP HP 72 Data Protector device discovery with advanced path failover Index A advanced path failover 6 Data Protector device discovery 71 details 11 installing 16 preparing the host 17 preparing the library 16 prerequisites 18 B series switches 19 C Series switches 19 H Series switches 19 uninstalling Windows 37 advanced path failover drivers downloading Linux 43 Windows 36 installing HP UX 48 Linux 43 Windows 35 updating Linux 43 user interface HP UX 48 Linux 44 B basic control path failover details 9 technology 11 basic data path failover details 8 basic path failover 6 prerequisites 18 Brocade switches 18 Cisco switches 19 E configuring control path failover ESL C3 23 25 MSL2024 MSL4048 MSL8048 MSL8096 32 MSL6480 27 configuring data path failover ESL G3 20 MSL2024 MSL4048 MSL8048 MSL8096 31 MSL6480 29 confirming failover operation on Windows 54 control path failover configuring ESL G3 23 25 configuring MSL2024 MSL4048 MSL8048 and MSL8096 32 configuring MSL6480 27 disabling ESL 26 enabling ESL G3 24 enabling MSL2024 MSL4048 MSL8048 and MSL8096 32 enabling MSL6480 27 verifying ESL G3 26 verifying MSL2024 MSL4048 MSL8048 and MSL8096 34 verifying MSL6480 28 conventions document 67 text symbols 68 D data path failover configuring ESL G3 20 configuring MSL2024 MSL4048 MSL8048 and MSL8096 31
41. Ua Em HM ees 23 Configuring control path EH Hen EN ICI MOX IuNN ON pop ru n Pe Sen EN ER dere tn 23 Enabling control path Tallovers 24 Configuration requirements after enabling control path 25 library lave EEEE A EE EE 25 SMS Le OI RE RT 20 Verifying control TO OT 26 Disabling control path occisa ead vom Urt Eurer tad edt istae d Hes hori tompo t d ia rossi a 26 6 Configuring failover for HP StoreEver MSL6840 Tape libraries 47 Configuring control path i p n 27 Enabling control pal Tile ssacieto iade ute dusitn sunu eoe astantes te dataset seed 27 Configuration requirements after enabling basic control path 28 Verifying control path DV EE beau t pi ete pd m otis dE Uc EHE bUI ue dad dd duras 28 Configuring data path TdlloVeDisersssssna tita spe pU dE tUt ua deno ler tuii espe iied e ipee POt iun 29 Contents 3 Enabling issii iai 29 Verifying data path usa c cis Eben 30 7 Configuring failover for
42. active and secondary drive chosen for basic control path failover will need to be in the same zone For basic control path failover with World Wide Port Name zoning the host Fibre Channel World Wide Port Name and basic control path failover World Wide Port Name assigned to the library must be in the same zone The Library World Wide Port Name is not the same as the World Wide Port Name of the drive that is hosting the library Hosts connecting to the library may need to be rebooted if the operating system does not support dynamic device detection Applications on hosts may need to be reconfigured to recognize the new library world wide name Prerequisites for using advanced data and control path failover With LTO 5 and LTO 6 drives with an 8G connection set the fill word set to arb ff With 4G connections set the fill word to idle The switch is running a supported version of software For a list of supported software see the compatibility matrix on the HP website http www hp com go ebs For advanced data path failover the host must have a physical path to both the first port and secondary port on the Fibre Channel drive For full failover capabilities the two drive ports should be connected to different switches and the host Fibre Channel ports should also be connected to the same two switches All drive ports must be zoned in the respective switches Hardware specific requirements for basic failover Brocade switches 18
43. al descriptor is present for each initiator which has established a Prevent 00b Medium removal shall be allowed Medium removal shall not be allowed Protocol Identifier 0 Fibre Channel 6 Serial Attached SCSI SAS Relative Target Port Identifier Initiator Identifier Clear Nexus Settings Fiber Channel Port_Name or SAS port identifier The Clear Nexus Settings action is used to clear legacy and persistent reservations placed on a changer device This can be used to recover from the loss of a host that has placed a reservation on the changer If an application is reporting Reservation Conflict errors when it attempts to access the changer device or Medium Removal Prevented errors occur when attempted to remove tapes from the changer even after the application is no longer using the library this function can clear those settings Figure 23 Clear Nexus Settings menu item f Advanced Failover Diagnostics Actions Refresh Cached Driver Data 5 Report Device Report Local SMC Clear Nexus Settings Enable Logging Windows debugging logs and tools 59 60 Before the action is performed the alert shown below is displayed Figure 24 Clear Nexus Settings warning NE WARNING This action will clear all reservations and prevent 4 medium removal settings some of which may be valid Do you wish to proceed No Enable Logging The Enabl
44. al g LTO5 FC 50014382 6 95001 50014382c6c95002 50014382c6c95003 Down O Active 14 Waming Primary Disabled IBFW 1 1 1 1 1 1 HU1206LW LTOS FC 50014382 6 95007 50014382c6c95008 50014382c6c95009 Active Q Active Good Secondary Active Disabled I5FW 1 1 1 2 1 1 HU1206M1g LTO6 FC 50014382c6c9502b 50014382c6c9502c 50014382 6 95020 Down O Active Warming Primary Disabled J2AW 1 1 1 8 1 1 HU1232PMH LTO6 FC 50014382c6c95031 50014382c6c95032 50014382c6c95033 Active Q Active Good Secondary Active Disabled J2AW 1 1 1 9 1 4 HU1232PMJ l4 Jl From the host computers confirm that the library is still accessible After confirming that library is still accessible the host logs should show a failover event Disabling control path failover 26 To disable control path failover Log into the Management Console as a user with Administrator privileges Select the Physical managed view Select Setup Partitions Control Path The Secure Manager Partitions dialog appears and displays all available partitions Select the partition and click OK The Control Path dialog appears with the command path drive highlighted in yellow and the failover drive selected Un select the failover drive and click OK Click Yes in the Warning dialog to take the partition offline Wait for the configuration change to complete Once completed the partition is automatically
45. alf is a virtual bus VB driver This VB driver provides a virtual device which manages the paths to all of the devices that support failover The lower half is a multi path function driver for the devices using the hardware ID created by the lower level filter driver Windows calls these hardware paths physical device objects PDOs The intermediate class driver creates two different type of devices in the Windows device manager The devices associated with the physical paths is shown as a SCSI bus and the device associated with the virtual device that manages the paths is shown as a device The lower half of this driver acts like a class driver and it attaches to the devices presented by the lower driver The upper half acts like a virtual bus driver presenting abstractions of devices to the layers above For example a single tape device may have many paths to it but only a single virtual tape device is presented to the layers above and the driver transparently manages the multiple paths to the physical tape device Figure 16 page 40 shows the various device objects presented by the drivers The abbreviations are e Physical device object e Functional device object e FPDO PDO created by bus filter driver e FFDO FDO created by bus filter driver e Control device object used by diagnostic interface Windows driver theory of operation 39 Figure 16 Drivers and device objects hplto Tape minic
46. ation about reservations and prevent media removal as shown in Figure 19 page 56 For tape drives the reservation and prevent media removal information is not tracked by the driver so the Cached Driver Data pane will not include that information for tape drives The Device Information pane contains data requested from the tape and changer devices when various actions are performed The bottom pane shows failover session information that has been requested for the selected device There are several actions that can be performed by the diagnostic application e Refresh failover drivers state information held by the diagnostic application e Request current failover information from tape and changer devices e Report and clear reservations on changer devices which had been set by hosts that are now offline e Enable extra tracing Refresh The information in the Cached Driver Data pane can be refreshed by selecting Actions Refresh Cached Driver Data F5 Figure 20 Refresh Cached Driver Data menu item f Advanced Failover Diagnostics Actions Refresh Cached Driver Data F5 Report Device Report Local SMG 4 Glear Nexus Settings Enable Logging Device information The Actions Report Device menu has three sub menu items see Figure 21 page 57 which report information on the drive or media changer selected in the Devices Information pane The data is displayed in the Devices Information pane Figure
47. basic control path failover is enabled the library is no longer presented as a logical unit behind the tape drive and is assigned a new Fibre Channel node name You can find the new world wide node name on the Status Library Status screen Verifying control path failover 28 Basic control path failover After enabling control path failover modify switch zoning if necessary to enable host access to the library To verity basic control path failover you can force a failover from the Drives gt Manual Control Path Failover screen and verify that the control path has moved to the passive drive NOTE There is always a library logical unit number hosted by a drive so the LUN indicator does not change when basic control path failover is enabled The library is presented as logical unit number zero on its own world wide node name when basic control path failover is enabled and is presented as logical unit number one on the drive world wide node name when basic control path failover is not enabled Advanced control path failover To verity advanced control path failover you will need to power off the control path drive to create a failover event You can find the active control path drive for a partition from the Status gt Partition Map gt Configuration Status screen shown in Status of the Partitions Configuration to verify basic control path failover page 29 To cause a failover event power off the active control pat
48. cessed using its device special file Finding the lockdown path 51 1l On HP UX host run xms H on the hardware paths that are in NO HW state For example rmsf H 0 4 0 0 0 1 0x50014380023560d4 0x1000000000000 2 Runioscan kfNH HBA path For example ioscan kfNH 0 4 0 0 0 HP recommends only enabling or disabling advanced path failover when the library is not opened by any applications If the advanced path failover is disabled while an application is accessing the library all of the library s lunpaths will go offline and I O requests to the library will fail 52 Installing and using HP UX advanced path failover drivers Troubleshooting failover operation To find diagnostic information about the operation of basic and advanced path failover e Examine the library event log or RAS tickets See Library path failover events page 62 and Additional tape drive sense codes page 65 e Examine the Windows Device Manager view of tape drives and media changers See Confirming path failover on Windows page 54 e drive support tickets contain more detailed information that may be required by HP support To find additional diagnostic information for advanced path failover e Examine the host log files for entries from the advanced path failover drivers o Windows system log page 55 or HP UX var adm syslog syslog log e Use host specific utilities to view the status of the
49. configuring MSL6480 29 diagnosing ESL C3 22 disabling ESL G3 23 enabling ESL G3 20 enabling MSL2024 MSL4048 MSL8048 and MSL8096 31 enabling MSL6480 29 verifying ESL G3 21 verifying MSL2024 MSL4048 MSL8048 and MSL8096 31 verifying MSL6480 30 Data Protector device discovery 1 diagnosing data path failover ESL G3 22 diagnostic applications Windows 56 disabling control path failover ESL G3 26 disabling data path failover ESL G3 23 document conventions 6 drivers HP UX 48 Linux 43 Windows 35 36 E Tape Library 6 enabling control path failover ESL 24 MSL2024 MSL4048 MSL8048 MSL8096 32 MSL6480 27 enabling data path failover ESL G3 20 MSL2024 MSL4048 MSL8048 MSL8096 31 MSL6480 29 ESL E Series Tape Libraries 6 ESL G3 configuring control path failover 23 25 73 configuring data path failover 20 diagnosing data path failover 22 disabling control path failover 26 disabling data path failover 23 enabling control path failover 24 enabling data path failover 20 failover events 62 verifying control path failover 26 verifying data path failover 21 F failover events ESL G3 62 MSL2024 MSL4048 MSL8048 MSL8096 64 MSL6480 63 tape drive sense codes 65 H help obtaining 67 HP technical support 67 HP UX command line user interface 48 drivers supporting advanced path failover 48 enabling or disabling advanced path failover 51 finding HP UX paths for dri
50. d Device serial number for failing Driver unable to load Error Path failover driver unable to load Path failure detected Error Path failure detected on SCSI Port 965 Bus 963 Target Id 4 Logical Unit 965 Path removal reported by Windows Error Path removal reported on SCSI Port 1 SCSI Bus 962 Informational Target ID 963 Logical Unit 964 Device ID 1 Device Names for failing path Error reported for failing path Informational Informational Device WWNN 961 2602 Device WWPN 963 264 Host WWPN 965 266 Device error NT status 961 SCSI Status 962 Sense Key 3 ASC ASCQ 964 965 Drive Error Code 266 967 Failover session established Informational Failover session established on SCSI Port 962 SCSI Bus 3 Target Id 964 Logical Unit 965 Failover session establishment error No alternate paths available Error Error Failover session establishment error on SCSI Port 962 SCSI Bus 3 Target Id 4 Logical Unit 5 Reason code 6 No alternate paths for device ID 1 Alternate path selected after a path failure Informational Alternate Path selected SCSI Port 1 SCSI Bus 2 Target Id 3 Logical Unit 4 operation NCN failure Failure to transition a passive control Error License key error NT status 1 SCSI Status 2 path drive to active Sense Key 3 ASC ASCQ 4 5 Drive Error Code 6 7 Failure to notify device of a failover Error Nexus change
51. drivers o Windows Advanced Failover Diagnostic Application page 56 command line user interface page 44 HP UX commands for viewing tape and library devices page 48 e Optionally install Windows debug checked build drivers which will save a crash dump in the event of a system crash See Windows driver debug dump setup page 66 e Use the Windows Advanced Failover Diagnostic application to clear library reservations and prevent media removal settings if Reservation Conflict or Medium Removal Prevented errors occur NOTE For known issues and workarounds see Known issues and workarounds page 69 Locating a failed path The system administrator should have a map of the storage area network which will indicate how ports on the various devices hosts switches and libraries are connected to one another Common causes of failed paths are e loose or unplugged cables e loose or unplugged Fibre Channel transceivers e Failed switch ports Powered off switches e Failed host bus adapter ports The first sign of a path failure such as a disconnected Fibre Channel cable or a failed switch is often an alert or warning reported by the library in the web interface and event log Failure of a single path to a drive should not interfere with operation of most backup applications and might go unnoticed To ensure that path failover functionality is restored for the next path failure correct
52. e 2 Port B 50 01 10 a0 00 00 00 02 Standby 1 Port A 50 01 10 a0 00 00 00 02 Passive 2 Port B 50 01 10 a0 00 00 00 02 Passive 1 Port A 50 01 10 a0 00 00 00 02 Downloading and installing the drivers l Locate the drivers on the HP website Navigate to http www hp com support storage Click Tape Storage Click Enterprise Class Tape Libraries for ESL G3 or Tape libraries for MSL6480 Click HP StoreEver ESL G3 Tape Libraries or HP StoreEver MSL6480 Tape Library In the Download options tab click Drivers software amp firmware For the ESL C3 select your product In the Operating System drop down select OS Independent Click Driver Storage Tape Click Obtain software for the High Availability Failover Driver for your operating system i Click Receive for Free k Follow the prompts to download the driver package 2 installer file as Administrator to install the Tape Upper Bus Storage Filter driver and restart when requested After the system restarts the installer will continue installing the Tape Multi Path Intermediate Class driver 36 Installing and using Windows advanced path failover drivers NOTE The installation requires Windows Installer version 4 5 or later If it is not present the installer reports the following errors e Error 0x80070643 Failed to install MSI package e Error 0x80070643 Failed to execute MSI package e Error 0x80070643 Failed to
53. e Logging action provides a mechanism for capturing run time diagnostic information from the drivers Figure 25 Enable Logging menu item f Advanced Failover Diagnostics Actions Refresh Cached Driver Data F5 Report Device L Report Local SMC Clear Nexus Settings Enable Logging Figure 26 Enable Logging dialog V probe anaemia File Size Limit Each restart or reboot will create two additional files 1024 0 no limit Restart ox c9 The Enable selection immediately begins capturing driver diagnostic information after OK 15 clicked The Enable setting is not persistent across a system reboot If the diagnostic information during a reboot is desired select the Continue after reboot option In the Log Files Location field enter or use the button to designate a local directory for log files There will be two files created when immediately capturing the diagnostic information e tapeapfousbf YYYYMMDDhhmmss bin e YYYYMMDDhhmmss bin Troubleshooting failover operation In these names YYYYMMDDhhmmss is the date and time OK was clicked After a reboot there also will be two files in the specified location e tapeapfousbf YYYYMMDDhhmmss bin NNN e tapeapfompic YYYYMMDDhhmmss bin NNN In addition to the date and time in these file names NNNN will be a number from 1 16 The File Size Limit value constrains the size of the log files and if the size limit is reached
54. ed In this example the tape drive presents both SSC tape and SMC media changer device servers Not all drives in the library will present an SMC device server Figure 15 Driver and system organization Mode Level Name User Mode Application Backup Application Class MiniClass Intermediate Class HPtapeFailover mpio Kernel Mode Bus Filter HPtapeFailover filt MiniPort Host Bus Adapter LPe12002 FC Tape Drive Storage Device SSCDevice Server SMC Device Server Library Controller Storage bus filter driver The storage bus filter driver is named HPtapeFailover filt and manages the OS notifications indicating that devices have been added or removed The storage bus filter driver bus enumerator is usually PCI It attaches as an upper filter to all HBA drivers It then monitors the creation of raw devices looking for supported failover capable devices Requests to all other devices are passed through unchanged When a supported device is recognized the hardware ID of the device is changed to a value that the upper device driver will recognize but that the rest of the system will not The special hardware ID prevents the standard tape class driver from attaching to the raw paths 38 Installing and using Windows advanced path failover drivers Multi path intermediate class driver The intermediate class IC driver HPtapeFailover has two halves The upper h
55. enabled for a drive e Link Status for both ports is listed as Active e Data Path Failover column displays Enabled Configuring data path failover 21 oons Ss WWNN WWPN Port 1 WWPNPort2 Link Status P1 Link Status P2 Mode Health Firmwarelevel Barcode Location PhysicalSN LogicalSN Vendor EEB Control Path Data Path Failover LTOS FC 50014380 02303001 5001438002303002 5001438002303003 Active G Active Online Good 6aw 8001914 1 1 1 1 1 1 HU19487U2Y 8002383001 HP Connected Primary Active Disabled LTOS FC 50014380 02303007 5001438002303008 15001438002303009 Active G Active Online Good I68W KR5209L5 1 1 1 2 1 1 HU19477P2H 8002383007 Conneded Secondary Disabled LTOS FC 50014380 023b300d 500143800230300 5001438002303001 Active G Active Online Good 168 11 13 11 HU19487U4P 18002383000 HP Disabled LTOS FC 50014380 023b3013 5001438002303014 5001438002303015 Active G Active Online Good I68W KRS820L5 1 1 1 41 1 HU19487U2F 8002383013 Conneded None Disabled 50014380 02363019 500143800236301 50014380023b301b Q Active Passie O Online O Good J3KW 1 1 1 5 1 1 HU1232PMLL 8002383019
56. ense has been added to the library Enabling control path failover Control path failover is enabled with the Expert Partition Wizard From the Configuration area click Expert Wizard in the Partitions menu to start the wizard Select the type of failover for the partition from the Select Control Path Failover Settings screen as shown in Figure 6 page 27 Figure 6 Selecting the control path failover type Select Control Path Failover Type None Control Path Failover Disabled Enable Basic Control Path Failover CPF NOTE Enabling Basic CPF will configure all applicable drive ports to Fabric mode Ex Enable Advanced Control Path Failover NOTE The ACPF feature requires a driver to be installed on the backup application server See Help for more details Figure 7 page 28 shows the Select Control Path screen of the wizard Select the active and passive control path drives In the example shown drive 1 is set as the primary path and drive 2 is set as the secondary path Configuring control path failover 27 Figure 7 Selecting the basic control path failover settings Select Control Path Settings Select Active Control Path Drive Drive 1 LTO6 Fibre Previously selected control path drive Select Passive Control Path Drive Drive 2 LTO6 Fibre Previously selected passive control path drive Configuration requirements after enabling basic control path failure When
57. eopen the device 82h 94h FAILOVER COMMAND SEQUENCE The advanced path failover system is unable to ensure that ERROR the command will be executed in the proper sequence Close all connections to the device and then restart application services 82h 95h DUPLICATE FAILOVER SESSION KEY The failover driver attempted to use a failover session key that is currently in use by another host The driver should automatically try a different key Restart application service if any errors occur 82h 96h INVALID FAILOVER KEY The failover driver attempted to use a failover session key that is not valid Retry opening the device or restart application services 82h 97h FAILOVER SESSION RELEASED An event caused the device to close the failover session that was in use The driver should automatically open a new session if not restart application services 82h 98h SMC STATE CHANGED A normal event informing the device driver that a event has caused a change in the media changer state information The device driver should automatically update media changer state information and continue 82h 99h FAILOVER SMC DEVICE SERVER A normal event informing the device driver that this path is MOVED not an active control path The device driver will automatically use a different path If advanced path failover is enabled on a tape drive or a library and the advanced path failover driver is not installed on the host this error will be reported to applications
58. ernel dump is preferred to the much larger complete memory dump Install the appropriate checked drivers for your operating system using the procedure in Downloading and installing the drivers page 36 When prompted whether to allow installation of an unsigned driver allow installation In Windows 2008 or 2012 enable the debug print filter by editing the registry a Runa registry editing application e g Regedit exe with administrative privileges b Navigate to LOCAL MACHINE SYSTEM CurrentControlSet Control Session Manager Debug Print Filter You may need to create the key Debug Print Filter c Add a new sub key DEFAULT this is different from the automatically created sub key Default with type DWORD and set itto 15 The registry value can be created by sending this command from a command window that has been opened with administrative privileges d As an alternative to steps Step 5 a through Step 5 c open a command window and issue the command reg add HKEY LOCAL MACHINE SYSTEM CurrentControlSet Control Session Manager Debug Print Filter v DEFAULT t REG DWORD D 15 e Restart the machine after updating the registry for the changes to take effect Download DebugView from http technet microsoft com en us sysinternals bb896647 and unzip the files to a local folder There is no installer Run DebugView and configure it to capture Kernel Mode debug output by checking Capture Capture Kernel Ctrl
59. ernel memory dump although the larger complete memory dump is acceptable Do not select the small memory dump If a bug check occurs then after a reboot the file can be retrieved and sent for diagnosis Driver debug dump setup Generating a driver debug dump log file requires installing checked drivers and the DebugView application This is an advanced technique For instructions see Windows driver debug dump setup page 66 Bug checks Hangs Following a bug check restart the system and retrieve the kernel dump for transmission to HP If driver debug dumps were enabled then retrieve the driver debug log file for transmission to HP If the system hangs the system can be configured to allow forcing a system crash from the keyboard This is explained in http msdn microsott com en us library f545499 v VS 85 aspx If the system hangs after configuring force the crash and reboot Then retrieve the kernel dump for transmission to HP Linux logs and troubleshooting tools Report cached reservation information The Linux advanced path failover driver tracks reservation information for tape libraries to enable rebuilding the reservations if a failure requires changing the drive that is hosting the library control path These commands dump the reservation information cache buffers to the var log messages file and the console Linux logs and troubleshooting tools 6 Legacy reservations echo legacy sys class pfo pfo4 ctrl P
60. ersistent reservations echo persistent sys class pfo pfo4 ctrl Prevent allow medium removal conditions echo prevent sys class pfo pfo4 ctrl Debug output control You can control the level of debug messages being sent to the console The default output level is minimum To minimize the level of debug messages echo 0x0000 sys bus scsi drivers pfo debug flag To maximize the level of debug messages echo Oxffff sys bus scsi drivers pfo debug flag NOTE Increased debug logging will affect performance The definition of all of the bits in the value is beyond the scope of this document Reading the trace log The failover driver maintains an internal buffer of the most recent significant events To read the trace log cat the trace file For example cat sys bus scsi drivers pfo trace Library path failover events When the library detects a path failover it generates an appropriate event Path failover events do not always occur immediately following a path break The device driver will wait until a command is sent and if the path is still failed the device driver will perform the failover actions and the library will report the event immediately after the failover See the library user guide for accessing and interpreting support tickets and log files 62 e ESL events related to advanced path failover page 62 e 516480 events related to path failover page 63 e MS
61. es physical link on drive 6 Active logical link to switch shares physical link on drive 10 Overview Technology for basic control path failover HP 5 and LTO 6 Fibre Channel tape drives use a technology called N Port Identifier Virtualization NPIV which is defined as part of the Fibre Channel standards maintained by the INCITS T11 working group see clause 6 in the FC LS 2 specification NPIV allows a single physical port to connect to a Fibre Channel switch multiple times using multiple node and port names Advanced path failover Advanced path failover uses capabilities in the LTO 6 tape drives and the libraries in which they are installed combined with software drivers running on a host system to provide path failover when multiple paths are available to a tape drive or to a library controller Advanced path failover is a licensed feature An example multi path configuration is shown in Figure 5 page 11 Figure 5 Example multi path configuration Server A i In this example configuration two different servers designated as Server A and Server B each have two different host interface ports that are connected to two different SANs Each SAN is connected to the tape library The connection between the library and the SAN in this example is a bundle of connections that contains a connection to one port on each drive in the library All of the drives in the library have two ports with one port connected into SAN 1 and
62. evice is next opened With the advanced path failover feature the best path will be chosen as the lockdown path If this path fails the driver will automatically fail over to the next available best path which becomes the new lockdown path for all further I O requests For additional information see the following man pages scsimgr 1 M ioscan 1 M mknod 2 mksf 1M rmsf 1M Installing advanced path failover drivers HP UX patches are available at https h20566 www2 hp com portal site hpsc patch home To locate the patches search estape eschgr and esct1 or the patch number and then look at the Prepby field to see if there is a superseding patch To install the advanced path failover drivers use the standard HP UX kernel patch installation process to install the following patches on the HP UX host servers running HP UX 11i v3 e HP UX Tape driver patch estape PHKL 43680 or superseding patch e HP UX Media changer driver patch eschgr PHKL 43681 or superseding patch e SCSI stack Mass storage stack driver patch esctl PHKL 43819 or superseding patch The server will automatically reboot as part of the installation process Commands for viewing tape and library devices connected to a system You can use ioscan to view the tape and library media changer devices connected to the HP UX host The device special file DSF is listed as the last item in the description as shown in bold type 48 Installing
63. formation or specific instructions NOTE Provides additional information X Provides helpful hints and shortcuts Subscription service HP recommends that you register your product at the Subscriber s Choice for Business website www hp com go e updates After registering you will receive e mail notification of product enhancements new driver versions firmware updates and other product resources HP authorized reseller For the name of your nearest HP authorized reseller e n the United States call 1 800 282 6672 e Elsewhere visit the HP website www hp com then click Contact HP to find locations and telephone numbers learn more at www hp com go tape 68 Support and other resources Known issues and workarounds Path failover issues are observed on Windows Server 2012 Symptom On Windows Server 2012 path failover issues are observed even after installing the advanced path failover driver and rebooting the server twice The installation file used was HP StoreEver High Availability Path Failover Driver Windows 2012 2012 R2 27550 01470 Workaround The installer for the initial release of the advanced path failover driver has a defect that results in an incorrect installation on Windows Server 2012 The defect in the installer has been fixed Download and install the updated driver package 1l Uninstall the advanced failover drivers a Select Start2Programs Control Panel
64. h drive from the Configuration gt Drives gt Settings screen and then verify that the partition still has access to the host Configuring failover for HP StoreEver MSL6840 Tape Libraries Figure 8 Status of the Partitions Configuration to verify basic control path failover 10 47 24 AM 10 24 2013 User administrator Logout Serials DEC321077W Status gt Partition gt Configuration Status Hostname steer 4 16 78 16 228 Firmware C 13 Partition Number 1 Partition Name CPF DPF Module 2 Base 0 Partition Number 1 2 Drives E mu 15 80 E Partition Name CPF_DPF Partition S N DEC321077W 1101 Number of Drives TA Empty Empty Number of Slots 140 Number of Mailslots 20 Y mme B de Label Length Rep to Host 8 arcode Label Len ep to Host 2 Drives an x 2 46 80 Barcode Label Alignment Rep to Host Left Key Manager Type KMIP Control Path Failover Advanced Active Control Path Drive Drive 1 LTO6 Fibre Passive Control Path Drive Drive 2 LTO6 Fibre Refresh Collapse All Library Status Cartridge Inventory Partition Map List View Graphical View Configuration Status Drive Status Network Status Command View TL Security After verifying library connectivity using each of the library control paths the library control path can be moved back to the original drive if needed by power cycling the alternate control path drive Configuring data path failover
65. h has been identified the advanced path failover device driver will send a command to the device using the new path to notify the device that a path has failed indicate which connection has failed and to provide state information Upon receipt of a notification that the path has changed the target device will automatically transfer all available settings and information from the failed connection to the new connection and use the state information provided in that change notification to synchronize the target state with the device driver state then will notify that device driver that it has successfully synchronized state Synchronization of the state includes any physical position changes necessary to position the tape in the correct logical position for that state After receiving notification that the state is synchronized between the advanced path failover device driver and the target device the advanced path failover device driver can take the steps necessary to recover any commands that were outstanding at the time of the failure For most commands recovery is accomplished by resending the original command Notifying the target device of the path change and performing the state synchronization in the target device removes complex state recovery algorithms from the driver and removes the risk of incorrect tape positioning during state recovery resulting in a higher performance lower complexity and less risky path failover method than a traditio
66. he original path is lost Most applications recognize the new path and some applications will automatically retry commands after the original path is lost Some applications might require user intervention to begin using the new path s available for the MSL2024 MSL4048 MSL6480 MSL8048 MSL8096 and ESL G3 Tape Libraries e Advanced failover Supported on LTO 6 FC tape drives Requires host driver support in addition to tape drive and library firmware features to manage multiple paths across multiple SANs present a single drive or library path to applications and automatically transfer commands to the new path if the original path is lost The transfer to the failover path is invisible to most applications avoiding the need for user intervention Overview s available for the ESL G3 and MSL6480 Tape Libraries 15 not available for the 1 8 G2 Tape Autoloader nor the MSL2024 MSL4048 MSL8048 or MSL8096 Tape libraries Traditional library control and drive connections without failover A typical connection for a Fibre Channel tape library using the drive to bridge commands to the library controller in a two drive tape library is shown in Typical bridged library controller connection page 7 Figure 1 Typical bridged library controller connection TOIT 5 1 1 HP Ultrium Dual Port Fibre Channel Tape Drives 2 Host c
67. hout rebooting the system by first removing the existing drivers and then loading the new version Verify that no applications have devices open that are using the advanced path failover drivers and then use rpm U filename to update the drivers See the release notes for specific file names Device files The advanced path failover driver will resolve all paths to a device into a single sg and st entry in the dev directory for each device Requests to open or send commands to that device path will use the path selected by the advanced path failover driver Alternate paths that address devices that are already known are entered into an internal alternate path list and device files are not created for those paths Installing advanced path failover drivers 43 Command line user interface The advanced path failover drivers support several configuration and diagnostic functions through a command line interface Most of the functions are accessed by directing commands to a specific path The following example shows the command for a specific path and the commands may be directed at any path by replacing the device identifier with the identifier from the sg or st device For example a command executed on p o3 will report information for the device at 3 and st3 Viewing the current driver revision Viewing device status 44 The driver revision number indicates the build date of the driver and can be viewed by runni
68. iew 3 Select Setup gt Partitions gt Data Path Failover 4 The Data Path Failover DPF dialog appears and displays 5 and LTO 6 drives You can filter the list by partition Select the drives for which you want to enable advanced data path failover ADPF or basic data path failover BDPF and then dick OK 20 Configuring failover for the HP StoreEver ESL G3 Tape libraries NOTE Any drives that belong to an access group and have hosts mapped to second port are considered to be custom mapped BDPF cannot be enabled on these drives until the custom mapping is removed Advanced Data Path Failover can only be enabled on LTO 6 drives Basic Data Path Failover can be enabled on both 5 and LTO 6 drives See the HP StoreEver Enterprise Systems Library ESL G3 Tape Library User Guide for more information on modifying partitions Path Failover OPR Filter Select Partition All v Data Path Failover Configuration Legend 7 Added Removed 88 Changed Unchanged E Custom Mapped Select the drive s you want to enable disable for Basic Data Path Failover BDPF or Advanced Data Path Failover ADPF from the table shown below Eligible drives must be configured in Fabric mode Only generation or greater drives can be used as DPF drives
69. ing the stale settings In the Windows diagnostic application it is found under Actions Clear Nexus Settings If the Windows diagnostic application or ESL G3 GUI is not available most settings can be cleared by using the library GUI to power cycle the tape drive hosting the library controller Persistent reservation settings must be cleared using the application that established the settings Known issues and workarounds B Data Protector device discovery with advanced path failover When using the Data Protector Autoconfigure functionality Data Protector will discover both active and passive control and data paths to the library robot control and drive paths respectively Data Protector will associate all active data paths with the active control path and can be identified by the library in the list that includes the selection box All other listed fibres will correspond to passive control paths All active data paths will be listed in the collapsed tree under the active control path The following example Data Protector Autoconfigure discovery result shows an ESL G3 library with 6 LTO 6 drives and the active control and data paths associated under the library Q Aetocenfigure Devices Data Protector Manager Eat View atins Hee Dewees t Mosa a a at 2 owronment Ba Automated Operations Devece Autoconfsgurabon Wizard Dences Device Please select Reames date device that
70. ink is able to receive a Fibre Channel signal and completes speed negotiation but the drive does not fully establish a connection using the standby link The library user interface might report the standby link as a passive connection The drive monitors the links for errors and following detection of a fault transfers the fabric identity world wide names and all settings mode parameters encryption settings etc over to the standby link and then activates that link When properly configured the change is minimally disruptive to the host and does not require any configuration changes on the host or in the backup application IF no drive commands are outstanding when a failure is detected the port change happens with virtually no disruption to the SAN If a command is outstanding on the link when a failure is detected the drive is not able to recover the command so that command fails but the application is able to continue to use the drive on the new path Many applications are able to recover from a single command failure as long as the communication path to the drive is not lost Overview Figure 3 Data path port failover example configuration 1 Primary data path 2 Secondary data path 3 Host connection 4 HP Ultrium dual port Fibre Channel tape drive Basic control path failover details Library basic control path port failover see Figure 4 page 10 may be configured with one drive hosting the active logical link to the
71. ist and then select the event and click Details to see more information about the failover event The Repair tab provides detailed instructions on how to troubleshoot and fix the problem Disabling data path failover To disable data path failover Log into the Management Console as a user with Administrator privileges Select the Physical managed view Select Setup Partitions Data Path Failover Uncheck the drive for which you want to disable ADPF or BDPF and then click OK Wait for the configuration change to complete Verify the configuration change by selecting Monitor Drives Data Path Failover is shown as Disabled After advanced path failover is disabled multiple paths to each device will be presented to the host The advanced path failover driver supports devices with or without advanced path failover enabled so uninstalling the advanced path failover driver is not required when advanced path failover is disabled OnAKRWN gt Configuring control path failover When basic control path failover BCPF is enabled the library is presented on the first drive Fibre Channel port If basic data path failover is configured on the drive the second Fibre Channel port will be one of the control path failover ports When advanced control path failover ACPF is enabled the library is presented on all the Fibre Channel ports of all the drives configured to handle the library control path Configuring control path failover 23 F
72. k on the drive hosting the control path in the event of a single path failure and in the event of a complete control path drive connection loss the standby library control path drive can be activated and connection to the library control path can be moved to that drive With LTO 5 and 6 tape drives driverless path failover feature uses library and drive firmware to create a new Fibre Channel path to a drive or library if the original path is lost Most applications recognize the new path and some will automatically retry commands after the original path is lost Other applications may require user intervention to begin using the new path With LTO 6 tape drives in addition to the driverless path failover feature HP offers a driver based path failover feature that uses drivers in conjunction with library and drive firmware to manage multiple paths across multiple SANs present a single drive or library path to applications and automatically transfer commands to the new path if the original path is lost This transfer is invisible to most applications avoiding the need for user intervention These failover features are presented in the library user interface as basic and advanced failover Basic failover 9 Supported on LTO 5 and 6 FC tape drives Data path failover requires a dual ported drive Supported by a combination of tape drive and library firmware features to create a new Fibre Channel path to a drive or library if t
73. lass driver HPtapeFailover_mpio Intermediate class driver gt gt HPtapeFa eu lt gt Emulex LPel1002M4 Miniport Driver C PDO c HP Ultrium 6Tape drive Dual Port Fibre Channel Device manager view The Windows Device Manager shows the instances of the failover paths which are configured Figure 18 page 42 In the system shown in Figure 17 the library has two tape drives and each tape drive has two primary ports attached to a different switch Each drive port presents both tape drive SSC and tape library SMC devices One of the drives will be configured to present the active tape library device paths and the second drive will be configured to present passive tape library device paths All tape drive paths are active 40 Installing and using Windows advanced path failover drivers Figure 17 Library configuration example e Switch Switch B 2 Library In this example there are two physical tape drives in the library each of these is shown under Tape drives as Hewlett Packard Ultrium 6 drive At boot time the drivers discovered eight paths to supported SCSI devices in the system although not all paths were in active use Each drive has an SSC device i e tape drive and an SMC device i e media changer Each of those can potentially be accessed through either of the drive s two primary ports for a total of two paths per drive and eight paths total
74. lling and using HP UX advanced failover drivers Advanced path failover for HP UX is implemented by updating HP UX drivers to support advanced path failover with the LTO 6 tape drives The drivers function as both failover and non failover drivers The updated drivers are e HP UX tape driver estape used for data path failover e HP UX media changer driver eschgr used for control path failover e HP UX SCSI stack driver esctl used for data path and control path failover During the device open the device driver checks to see whether the device is capable and enabled for advanced path failover If so the device driver opens a failover session and continues with further device operations Otherwise the driver uses the non failover driver code Note that until the device is opened for the first time the drivers do not know whether the device is capable of advanced path failover or not HP UX 11i v3 performs automatic load balancing and will open new tape drive connections using the best available path to spread the load across all available paths In HP UX 11i v3 the default load balance policy for tape drives and libraries is the Path lockdown policy With this policy the host determines a path for sending I O requests to the device when the device is opened for the first time and this path remains fixed Without the advanced path failover feature installed if this path fails a new path is only chosen when the d
75. lt port configuration for HP StoreEver MSL Tape Libraries is Automatic and must be changed Figure 12 page 33 shows the HP StoreEver MSL Tape library network administration drive configuration pane for a dual port drive The configuration for port A is set correctly for use with basic control path failover The configuration for port B is still set to the default setting of Automatic A single port drive will not have port B Configuring failover for other HP StoreEver MSL Tape Libraries Figure 12 Configure library basic control path failover configuration disabled CODENA LS oo Drive Configuration Note Read the Help page for more information before checking this option Drive 4 LUN V Power On Data Path Failover Enabled Port A Configuration Speed Automatic v Port Type Fabric NF v Addressing Mode Soft ALPA 0 0x01 Y Port B Configuration Speed Automatic v Port Type Automatic v Addressing Mode Soe ALPA 0 01 Drive 2 V Power On Figure 13 page 33 and Figure 14 page 34 show the System configuration pane In Figure 13 page 33 the option for Enable Library Control Path Failover is not selectable and the option for Alternate Drive for Library Control Path Failover is set to N A When the options for enabling basic control path failover are not available the configuration requirements have not been met The configuration shown in Figure 12 page 33 where
76. n 50014382c6c2f002 1 0 0 0 up wwpn 50014382c6c2f002 1 0 2 0 up wwpn 50014382c6c2f003 sg dev sgl st none wwnn 50014382c6c2f800 type changer session key cae82d14 0 0 3 1 up active drive 0 0 0 1 up last prefer active drive 0 0 1 1 up 0 0 2 1 up 152005 active drive 1 0 1 1 up 1 0 2 1 up active drive 1 0 3 1 up sg dev sg2 st dev st1 wwnn 50014382c6c2f007 type tape 0 0 1 0 up wwpn 50014382c6c2f008 0 0 2 0 up wwpn 50014382c6c2f009 1 0 1 0 up wwpn 50014382c6c2f008 1 0 3 0 up wwpn 50014382c6c2f009 In this example the tape drive at the top of the list can be accessed via either dev sgO or dev stO The other tape drive is available via either dev sg2 or dev stl An application has a device file open to the drive at the bottom of the list and the most recent command was sent to the drive via the path 0 0 2 0 The library is accessed via dev sg1 The path most recently used to access the library was 0 0 0 1 At some time in the past an administrator specified path 0 0 0 1 to be the preferred path to the library There are four paths to each drive Since both drives are connected to the library there appear to be eight paths available to the library The drive at dev stoO is the active drive which means that the driver will use that drive to access the library The active drive can be inferred by looking at the path numbers The last digit e g the
77. nal driver where all recovery is performed by the driver Active and passive control path drives The SCSI connection to libraries using advanced path failover is through the physical link in a tape drive Libraries that support advanced path failover will configure two different tape drives so that they present a library control path Medium Changer device and forward commands addressed to the library control path device on to the changer controller in the tape library One of the tape drives will be configured as an active control path drive which means that the library control device presented by this tape drive will accept commands such as MOVE MEDIUM for the changer device One of the tape drives will be configured as a passive control path drive which means that the library control device presented by this tape drive will accept device discovery commands such as INQUIRY but will reject commands such as MOVE MEDIUM The advanced path failover drivers will automatically select an active path to the library and will automatically reconfigure which drive is the active control path drive when reconfiguration is necessary during failover The Advanced path failover 13 tape library user interface will show which control path drive is the current active control path drive Library controller path failure recovery 14 In most cases the library controller path failure recovery is the same as the tape drive path failure recovery If all pa
78. necting more than 32 hosts may cause performance degradation if extra hosts are attempting to access the drives or library while another host is using the device Use switch zoning or Secure Manager to configure the SAN or library so that only hosts that need to access the devices are able to connect Configure redundant connections Each tape drive in the library has two ports For best results the drives should be connected to two different SANs with all of the first ports connected to one SAN and all of the second ports connected to another SAN The total number of SAN switch ports required for connecting the library is twice the number of tape drives installed in the library IF both ports for a tape drive are connected to the same switch fault tolerance is reduced as a single switch failure will cause loss of connectivity If only one switch is available that switch must be zoned to create two logical SANs Review the SAN design guidelines The general SAN design guidelines for tape are documented at http www hp com go ebs Preparing the library Advanced path failover is a licensed feature with Control Path Failover and Data Path Failover licensed separately Licenses for all failover solutions are also available as a high availability bundle Control Path Failover provides path fault tolerance for the robot controller and Data Path Failover provides fault tolerance for the tape drive data path Each feature is licensed once for each
79. ng cat proc scsi sg version You can view the status of a device that is controlled by the failover driver by reading a file in the sys file system For example to see the path status for dev sg3 cat sys class pfo pfo3 paths Terms active_drive down last open prefer session_key wwnn wwpn A path to a tape library via an advanced path failover active drive The driver is aware of this path but if the driver attempted to use this path at this time it would fail and another path would need to be chosen The path that the driver was most recently able to successfully perform a SCSI command on This is probably the path that will be used next There are no dev files open to this device The path that the driver was most recently able to successfully perform a SCSI command on This is probably the path that will be used next There is at least one dev file open to this device The driver will attempt to send the commands on this path after the next device file open call This path will override the last known good path The identifier number of the open session in hexadecimal World wide node name of the device World wide port name of the Fibre Channel port on the device Installing and using Linux advanced path failover drivers Example 1 Example paths cat sys class pfo paths sg dev sg0 st dev stO wwnn 50014382c6c2f001 type tape 0 0 3 0 up wwpn 50014382c6c2f003 0 0 0 0 up 2 wwp
80. nitiator is using the library Some applications create an exclusive connection to the tape library and prevent drivers from performing proper discovery and binding Note that this is not unique to the HP APF drivers and can occur in environments not using the APF drivers as well Workaround For Windows reboot or rescan devices while the library is not being used For Linux reboot or remove and re insert the advanced failover drivers using modprobe while the library is not being used A failure of the active control path drive and activation of the passive control path drive near the same time that a reservation is being released may result in the reservation not being released correctly Symptom Tape library access commands fail with Reservation Conflict errors or Medium Removal Prevented errors In rare cases where access to all paths on the active control path drive is lost at the same time that a reservation or prevent media removal setting is in the process of being changed or if all paths are lost to an active control path drive in a multi initiator environment and one host does not recover from the path failure it is possible to have a reservation or prevention setting that is no longer associated with a host Note that this is not unique to the APF driver and is most likely to occur in traditional multi path configurations Workaround Both the ESL G3 library font panel and the Windows diagnostic application provide a method for clear
81. on Overview Driver operation during normal communications The advanced path failover driver passes commands through without any command translation and with minimal additional processing in normal operation to retain the maximum possible performance During normal communication the advanced path failover driver does not introduce additional commands that would cause delays for example commands to determine position during reading and writing Path failure detection The advanced path failover driver uses notifications from the SCSI subsystem that report link failures immediately following a path failure which allows recovery to happen as quickly as possible so most recoveries complete before the standard command timeout In some operating systems the path failure notification is received immediately after the failure and the failover drivers are able to perform path failure recovery even if there are no outstanding commands In other operating systems the advanced path failover drivers are only notified of a path failure when a command is transmitted over that path Path failure recovery Following detection of a path failure the advanced failover driver queries a path verification feature in the tape drive to test paths until a valid path to the device is detected The path verification feature allows rapid detection of failed and valid paths without waiting for long timeouts or hardware specific notifications After a new pat
82. only one drive port is configured for Fabric is an example configuration where these options would not be available Selecting the Help link in the note following the option brings up a help page listing the configuration requirements Figure 13 Configure library basic control path failover configuration disabled sats coa KCIIINETTR ssm Logical Libraries Select Mode System Configuration Library LUN Hosted By Drive Library Mode Reserved Slots Mailslot Configuration Enabled Auto Clean Enabled Barcode Label Length Reported To Host Barcode Label Alignment Reported To Host Ignore Barcode Media ID Not Recommended Magazine access using front panel Admin password required Select Language Extended Mode Enabled Enable Library Control Path Failover Alternate Drive for Library Control Path In Figure 14 page 34 the configuration requirements for enabling basic control path failover have One Logical Library Currently configured 1 77727 1 Random Sequential Automatic Autoload Loop 0 v y 8 Left Warning Read the Help page for more information about Ignore Barcode Media ID before checking this option English Warning Read the Help page for more information about Extended Mode Enabled before checking this option nene the Help page for more information abo
83. onnection 3 Internal connection In the typical bridged library controller connection each tape drive has one physical link to the SAN switch and connects to the SAN switch as one Fibre Channel device The tape drive hosting the library controller path connects as one Fibre Channel device containing two logical units The tape drive is logical unit number zero and the tape library is logical unit number one The tape library Fibre Channel device contains a tape drive logical unit and a media changer logical unit The logical view of the tape library is shown in Logical view of traditional configuration page 8 7 Traditional library control path and drive connections without failover Figure 2 Logical view of traditional configuration 1 HP Ultrium Dual Port Fibre Channel Tape Drives 2 lun O at the WWPN of this drive 3 lun 1 at the WWPN of this drive 4 lun O at the WWPN of this drive 5 Host connection Basic path failover Basic path failover uses features in the tape drive and library firmware to recover paths following a link failure Basic data path port failover details 8 Basic data path port failover see Figure 3 page 9 can be configured on each LTO 5 or LTO 6 dual port Fibre Channel tape drive in the library When basic data path port failover is configured one link is active and is the primary data path The second link is a standby data path The drive verifies that the second l
84. ons and prevent allow settings over to the alternate control path drive and activates the control path on the alternate drive When properly configured the change is minimally disruptive to the host and does not require any configuration changes on the host or in the backup application Basic path failover 9 NOTE The MSL libraries monitor drive removal events and if the active control path drive is removed the library will automatically move the control path to the standby drive However if the control path drive is not removed but SAN connectively is lost the administrator might need to use the library remote management interface to move the control path to the standby drive If no library commands are sent while the port is being reconfigured the port change happens with virtually no disruption to the SAN Commands sent while the port is being reconfigured might be completed but cannot report the command status to the application so the application will receive an error Applications that retry commands are able to use the library following reconfiguration of the port Applications that do not retry can be restarted remotely without making any hardware configuration changes Figure 4 Control path port failover example configuration 1 Primary data path 2 Standby data path 3 Host connection 4 HP Ultrium Dual Port Fibre Channel Tape Drives 5 Passive logical link to switch shar
85. or both and BCPF you must configure a secondary control path drive and the ports that drive will be standby control path failover ports that can be activated in the event of complete loss of connection to the primary control path drive Standby control path drive ports are still active data path ports and can be used for tape drive access even when the drive is configured as a passive control path drive IF the active control path port goes down the library transfers various settings to one of the passive ports and then either the library enables the control path failover port for basic path failover or the driver switches the active path for advanced path failover For prerequisites see Configuring data path failover page 20 Enabling control path failover To select a partition and configure control path failover 1 Logon as administrator 2 From the main console select Setup Partitions Control Path 3 When prompted select the partition you would like to configure Click OK The Control Path dialog box appears In the Control Path CP Selection pane select the primary control path drive 5 Select the drive you wish to configure as the standby control path failover drive from the Control Path Failover CPF Selection list NOTE 4 drives do not support failover 5 and LTO 6 drives support Basic Path Failover but only LTO 6 drives are supported for advanced path failover P Under CPF
86. ost operating system e Installing and using Windows advanced path failover drivers page 35 e Installing and using Linux advanced path failover drivers page 43 e Installing and using HP UX advanced path failover drivers page 48 Preparing the host 17 4 Preparing the switches and hosts for failover Prerequisites for using basic data and control path failover The library drive FC ports must be attached to a Fibre Channel SAN that supports NPIV and NPIV must be enabled LTO 5 and 6 drives need an 8G connection with the fill word set to arb ff With 4G connections set the fill word to idle The switch is running a supported version of software For a list of supported software see the compatibility matrix on the HP website http www hp com go ebs The drive port FC topology must be in Fabric mode and the switch side must be set to F port or Auto Sense The host Fibre Channel port must have a physical path to both the first port and secondary passive port on the Fibre Channel drive For basic data path failover with port zoning the host Fibre Channel port and both ports on the drive need to be within the same zone for failover to work For basic data path failover with World Wide Port Name zoning the host Fibre Channel World Wide Port Name and a single first port on the drive need to be in the zone For basic control path failover with port zoning the host Fibre Channel ports and the ports on both the
87. other HP StoreEver MSL Tape libraries a1 Configuring data path port failover ave tiic Umi dbi pe iba dE E DD E 31 Enabling data path port follevel sss vnc tos Eu E uS Ld diu oia us 31 Verifying data path port 31 Configuring basic control path Tolllover iuu oce ertt se tt E SENE ENS HEY dE Fat ES REPRE NE E Leu eH 32 Enabling control path port failover on the library perio b rita terere Er rete 32 Configuration requirements after enabling control path 34 Verifying basic control path OWETS sait e optet o ttu matr pretii eorura tuli eiie elena ti esce 34 8 Installing and using Windows advanced path failover drivers 35 Installing the Windows advanced path failover drivers 36 Downloading and installing dnieerenevcnmeiiverenedenweereieaeansebion 36 Uninstalling I II bemnesie ne tdece a iunivausemcaeuedesousepeasetdsken auennesceecaneouied 37 Windows driver theory of 37 US psi ira Qe T wot RN FE Rap A 37 Storage THESE si catus Fn base mri E abere bae ti cmn bad Qa e asta di Lo On tinpnE 38 Multi path intermediate class CINE nscccrswescnswevesdaieqravsenussud ed EP atat i duced eus eres 3
88. over In the example above Changer0 and Changer2 are paths to an ESL G3 library partition that is not using advanced path failover so two entries are shown for the same changer Changer advanced path failover enabled and is only listed once Since 5 and older drives do not support advanced path failover only LTO 6 and newer drives will be listed The Paths pane shows information about the device which is selected in the Drives pane In Figure 19 page 56 the information is for the media changer named Changer1 The capital A in the Port column of the Paths pane indicates the active control path to the SMC device server that is currently being used and the lower case a indicates alternate active control paths to the SMC device server Troubleshooting failover operation Actions All other paths are passive i e they pass through a passive control path drive see Active and passive control path drives page 13 If the selected device is a tape drive the capital A indicates the active data path and there will be no lower case a The Cached Driver Data pane shows the last state of the selected device that was reported by the failover drivers to the diagnostic application Because changes in the drivers information about a device are not automatically sent to the diagnostic application it is necessary to perform a refresh to get the latest state of the drivers For tape libraries the cached driver data will contain inform
89. over could be enabled and the advanced path failover driver installed on the library control host but the drives may be configured without path failover IF a single ESL G3 library needs to serve both hosts that have advanced path failover drivers installed and hosts without advanced path failover drivers the ESL G3 library can be configured with pools of drives where all of the hosts with advanced path failover drivers use one pool of drives and advanced data path failover is enabled on those drives At the same time a second pool of drives in the same partition either has basic data path failover enabled or no data path failover enabled The second pool of drives is accessed by the hosts that do not have advanced path failover drivers The MSL6480 does not support mixing basic and advanced path failover so the drives connected to hosts without advanced path failover drivers must be configured without path failover enabled For instructions on installing advanced path failover for your library see e ESL G3 Configuring failover for the HP StoreEver ESL G3 Tape Libraries page 20 e 516480 Configuring failover for StoreEver MSL6840 Tape Libraries page 27 Preparing the host Hosts used with advanced path failover must be configured with two different data paths and should be configured with two different HBAs For supported HBAs see the compatibility matrix on the HP Archive Backup and Recovery Solutions website http ww
90. put online Configuring failover for the HP StoreEver ESL Tape libraries 6 Configuring failover StoreEver MSL6840 Tape Libraries The MSL6480 Tape Library supports both basic and advanced path failover though basic and advanced path failover cannot both be used in a partition at the same time For example advanced data path failover can be used with advanced control path failover or without control path failover but not with basic control path failover Configuring control path failover Control path failover is configured for each partition with the Expert Partition Wizard The requirements for using basic control path failover in a partition are e LTO 5 or two LTO 6 Fibre Channel drives of the same type Ultrium 6250 half height 3000 half height or Ultrium 3280 full height are in the partition Additional tape drives may be included in the partition but cannot be configured for failover e Advanced and basic failover may not be mixed within a partition e Data Path Failover license has been added to the library The requirements for using advanced control path failover are e Two 6 Fibre Channel drives are in the partition SAS and earlier generation tape drives can be in the same partition but cannot be configured for Advanced CPF e Basic data path failover is not enabled for the partition Advanced and basic failover may not be mixed within a partition e Control Path Failover lic
91. r The data is displayed in the Devices Information pane Figure 22 Report Local SMC menu items f Advanced Failover Diagnostics Actions Refresh Cached Driver Data F5 Report Device Report Local SMC Clear Nexus Settings Enable Logging Troubleshooting failover operation as Legacy Reservations Persistent Reservations Prevent Medium Removal Table 5 Local SMC device server information Menu item Legacy Reservations Data SET 1 An initiator has a legacy reservation established 0 No initiator has a legacy reservation established NOIV 1 The following fields are valid 0 The following are not valid and should be ignored Protocol Identifier 0 Fibre Channel 6 Serial Attached SCSI SAS Relative Target Port Identifier Initiator Identifier Fiber Channel Port Name SAS port identifier Persistent Reservation PRgeneration A counter of persistent reservation settings changes that have occurred SET 1 A persistent reservation is established 0 No persistent reservation is established PTPL A 1 Persist through power loss capability is activated 0 Persist through power loss capability Full status descriptors see SPC 4 Prevent Medium Removal SET 1 An initiator has a prevent medium removal established 0 No initiator has a prevent medium removal established prevent medium removal A prevent medium remov
92. r field will show the type of data path failover configured Verify that the interface status for both ports is Login complete 3 the host verify connectivity to the drive 30 Configuring failover for HP StoreEver MSL6840 Tape Libraries 7 Configuring failover for other HP StoreEver MSL Tape Libraries The HP StoreEver MSL2024 MSL4048 MSL8048 and MSL8096 Tape Libraries with dual port LTO 5 or LTO 6 FC tape drives support basic data path failover The HP StoreEver MSL2024 MSL4048 MSL8048 and MSL8096 Tape Libraries with multiple LTO 5 or LTO 6 FC tape drives support basic control path failover Configuring data path port failover Enabling data path port failover For best results and compatibility with basic control path failover HP recommends that the drive ports be configured in fabric mode and connected to a switch Basic data path failover is configured for each drive using the drive configuration options in the library network management interface Enabling data path port failover page 31 shows the drive configuration options in the library network management interface In this example data path port failover is enabled for drive 1 but is not enabled for drive 2 Note that in this example control path port failover is also enabled When control path port failover is enabled the port type is required to be fabric so the port type selections are disabled Figure 10 Enabling data path port failover CREE ce Ce
93. r the partition Control Path CP Selection CPF Mode CP Drive 82 6 4 0 E co wade J None I Basic Advanced Control Path Failover CPF Selection Legend Selected Control Path Drive Unsupported CPF drive Select SerialNumber Status Location WANN n v 82C6E4F001 Online 1 1 1 1 1 4 50014382 cbe4f001 LTOB Using the control path drive s WW NI in the Drive Status screen you can find the corresponding target ports which in this example are 50014382c6e4f008 and 50014382c6e4t009 D Drive Status x Type VAN Port 1 WWWPN Port 2 Link Status P1 Link Statu OF 0014382 86 4 0 014382 6 4 0 1114382 86 400 Active Q Active LTOB FC 50014382 06641007 50014382 6 4 008 5001438266 4009 JO Active Active LTO6 0014382 cBe4f 0d 50014382 6 4100 150014382 4 007 Active Active LTOB FC 50014382 cbe4f013 50014382cBe4f014 50014382cBe4f015 Down Active LTOB FC 50014382 cBe4f019 50014382cBe4f 1a 50014382cBe4f 1b O Active Active LTOB FC 50014382 cBe4f 1f 50014382cBe4f020 50014382 6 4021 O Active Active To find this information with HP UX commands use ioscan knNfC autoch to see the list of tape libraries and then use ioscan m lun H H W path for the partition For example if the LUN hardware path for the library is 64000 0x a00 0x12 d ioscan m lun H 64000 0xfa00 0x12
94. referred path if it is indicating a library control path using a passive drive In this case the driver will select a control path hosted by an active drive instead You can configure the preferred path by writing to a sys file For example to configure a preferred path on dev sg5 Command line user interface 45 echo prefer 8 0 1 0 gt sys class pfo pfo5 ctrl You can disable the configuration of a preferred path by creating an empty prefer entry in the crt1 file For example echo prefer gt sys class pfo pfo5 ctrl Path rotation exercise function Path rotation is a test function that will cause the driver to change the path it uses each time the device file is closed and reopened To cause the path to change with every open of the dev file set rotate 1 For example echo rotate 1 gt sys bus scsi drivers pfo ctrl To stop path rotation set rotate 0 For example echo rotate 0 gt sys bus scsi drivers pfo ctrl Enabling advanced path failover on a device while the driver is running If a device has any advanced path failover feature disabled when advanced path failover is enabled the device will reset itself removing the old dev file When the device comes back up it will be recognized as an advanced failover device It will then operate normally as an advanced path failover device It may not have the same dev file name as before the switch Disabling advanced path failover on a device while the driver i
95. ries switches For best reliability use minimum revision v7 4 0 21 0 Hardware specific requirements for advanced path failover 19 5 Configuring failover for the HP StoreEver ESL G3 Tape Libraries Configuring data path failover When basic data path failover is enabled the drive is presented on the first drive Fibre Channel port by default and the second Fibre Channel port is a passive port If the primary port goes down the library transfers various settings over to the passive port and then enables the failover port When advanced path failover is enabled the drive is presented to the host over both SANs and the host driver determines the active path Prerequisites for basic and advanced data path failover e HP StoreEver ESL G3 Data Path Failover license must be installed on the library host must have a physical path to both the first port and secondary port on the FC drive Additional prerequisites for basic data path failover e Only 5 and LTO 6 Fibre Channel tape drives support basic data path failover e library must be attached to a Fibre Channel SAN that supports NPIV e The drive port Fibre Channel topology must be in Fabric mode e paths to the Fibre Channel drive must be accessible from the same HBA and all of the devices need to be within the same zone e f Secure Manager is enabled hosts that need access to the control path must be given robotics device access to the first Fibre
96. rivers hide the details of this from the rest of the system The objective is for the rest of the system including all applications running on the system and all other device drivers to see a single changer or tape device but not the redundant paths to the failover enabled devices If a path failure occurs it should be transparent to the rest of the system including applications If a path fails the drivers work with the device to transfer communication to a new path and recover the command that was in process when the path failed Installing and using Windows advanced path failover drivers 9 Installing and using Linux advanced path failover drivers The advanced path failover drivers for Linux replace the normal SCSI Tape and SCSI Generic drivers The advanced path failover drivers for Linux pass all SCSI commands for devices that do not support advanced path failover through the same code path that is followed when the standard drivers are loaded and route commands for devices that do support failover through the new p o driver The advanced path failover drivers for Linux perform automatic load balancing and will automatically select a path with the fewest open tape devices Installing advanced path failover drivers l For systems using Symantec NetBackup Using the advanced path failover drivers with NetBackup requires the creation of specific paths in the sys filesystem To allow the advanced path failover drivers to create the neces
97. rmines whether failover is enabled for the device If the device supports advanced failover and failover is enabled the driver masks all duplicate paths and presents a single path to application clients If the device does not support advanced failover or if failover is not enabled the driver will not modify the presentation of device paths to applications To improve throughput for multiple tape drives the driver attempts to balance the number of tape drives on each HBA path When opening a tape drive device file the driver selects the path with the fewest number of open tape drive device files The load balancing algorithm does not take path speed into account when selecting a path If the load balancing algorithm cannot select an appropriate path it will select the last known good path or another available path If a preferred path is configured this path will take precedence over the load balancing method See Setting the preferred path page 45 Installing and using Linux advanced path failover drivers Load balancing is only applied when a tape drive device file is opened by the first thread the paths are not reevaluated at other times For example e failover algorithms do not consider other tape drive paths when selecting a path e The path is not changed if another thread already has the tape drive device file open e The path is not changed during data transfers Linux driver theory of operation 47 10 Insta
98. rol path drive Overview 2 Enabling basic path failover To successfully enable basic path failover complete the following Verify that the switch and host prerequisites are met See Preparing the switches and hosts for failover page 18 Verify that the tape drive and library prerequisites are met and then configure failover for your library Configuring failover for the HP StoreEver ESL G3 Tape Libraries page 20 Configuring failover for HP StoreEver MSL6840 Tape Libraries page 27 Configuring failover for other HP StoreEver MSL Tape Libraries page 31 3 Installing advanced path failover To successfully install advanced path failover complete the following e Prepare the SAN See Preparing the SAN page 16 e Prepare the library See Preparing the library page 16 e Prepare the host See Preparing the host page 17 Preparing the SAN To prepare the SAN review the following e Minimize host access page 16 e Configure redundant connections page 16 e Review the SAN design guidelines page 16 e Verify that the switch prerequisites are met See Preparing the switches and hosts for failover page 18 Minimize host access Advanced path failover is supported for a maximum of 32 hosts connected to each tape drive or tape library Each host should have two to four ports for a total of 64 to 128 connections to each tape drive or tape library Con
99. ry Controller Port B ID 4 LUN 1 50 01 10 a0 00 00 00 02 In this example the server is able to evaluate the worldwide identifiers to determine that there are two paths to each of two different tape drives and four paths to a library controller In a typical multi path configuration all of the paths for each device are available to the application which must resolve redundant paths and choose a preferred path When advanced path failover drivers are installed on the server the drivers will query each device for support of advanced path failover and if the device supports advanced path failover the drivers will select a preferred path for each device and establish a connection using the preferred path Only one path will be visible to the application Driver operation during device open When an application requests that a connection to a device be opened the failover driver will connect to the selected device and if that device supports advanced path failover will negotiate for a connection a nexus using INCITS T10 standards terminology to that device Computers running Windows will open a connection to each device when the server is booted Computers running HP UX and Linux don t open a connection to the device until an application opens the device for reading and or writing Each device supports up to 32 simultaneous failover connections If a failover connection is available a connection between the host driver and the device is created
100. s running Disabling advanced path failover while a device is running is not recommended because the paths will not be cleanly removed and reassociated If advanced path failover is disabled on any device the Linux server will need to be rebooted When possible power down the linux server cleanly and then disable advanced path failover on the device and then boot the Linux server Linux driver theory of operation 46 The Linux advanced path failover drivers support data path failover and control path failover on HP LTO 6 FC drives integrated into HP libraries The failover functionality is provided by the p o driver and modifications are made to the standard st and sg drivers to call into the p o driver if a device supports advanced path failover The modified st and sg drivers are called stmp and sgmp The failover device driver must identify devices accessible over the different paths available and associate paths with devices so that the driver can mask duplicate paths and present a single path to an application As devices are discovered by the operating system and the device information is passed into the driver for initialization the driver determines if the device is a tape or library device and if so whether it is a candidate for failover If the device is a candidate for failover the driver determines the serial number SN or worldwide name WWN of the device If the device is capable of advanced path failover the driver dete
101. s still accessible the host logs should show a failover event 3 To verify that failover occurred navigate to Monitor Drives to launch the Drive Status dialog The link status for the first port is Down and the link status for the second port is Active as shown below 7 Drive Status Tye WANN WWPNPott WWPNPot2 LinkStatus P1 Link Status P2 LTOS FC 15001438002364001 15001438002364002 5001438002384003 Active LTO5 FC 1500 143800236007 5001438002369008 00143 Diagnosing basic data path failover 22 When a drive failover occurs the Drives subsystem has a warning state which is displayed in the Overall System Status section of the Management Console Configuring failover for the HP StoreEver ESL G3 Tape Libraries 1g ESL G3 Library Management Console user security Operations Monitor Setup Tools View Connection Help BEE System Information Name Partition 1 Status Online IP Address 16 78 6 146 Partition Serial 2U31000103 Contact Date Thu 17 Jan 2013 10 33 25 GMT Activity Idle HW Revision 2 Managed Views rSlots Utilized abslib24 Physical Part 1 Partition Occupied Slots 9 18 Data Transfer r Configuration L READ 90 11 89 Tape Drives 3 Drive Types LTO MIXED Storage Slots 18 Library Type 11 14 17 20 23 2 3 8 ESL G3 Series LAST 24 HOURS Overall System Status Click Drives to display the Event L
102. sary directories when the drivers are installed echo options pfo netbackup 1 etc modprobe d pfo netbackup conf 2 Download the drivers for the revision of Linux running on the server Drivers for a specific revision of Linux will not operate properly in other revisions See the most recent release notes to find out which RPM file to use for the Linux operating system that is running on the server Navigate to http www hp com support storage Click Tape Storage Click Enterprise Class Tape Libraries for ESL G3 or Tape libraries for MSL6480 Click HP StoreEver ESL G3 Tape Libraries or HP StoreEver MSL6480 Tape Library In the Download options tab click Drivers software amp firmware For the ESL C3 select your product In the Operating System drop down select OS Independent Click Driver Storage Tape Click Obtain software for the High Availability Failover Driver for your operating system Click Receive for Free Follow the prompts to download the driver package pov ao 3 To install the drivers rpm ivh lt filename gt rpm The filename is version dependent See the release notes for filenames for the version you are installing 4 n some cases the server will need to be rebooted to complete the installation Check the instructions provided by the RPM file output and reboot the server if requested Updating the driver without rebooting The advanced path failover driver may be updated wit
103. ssue Failover has been disabled EF data path failover related error has occurred FF The master drive was removed without being The master drive must be powered off from the powered off Library path failover cannot be library web interface or front panel to activate performed control path failover 0x33 Control path failover reported A control path failover event occurred The master drive was successfully switched to the alternate master drive This is an informational event 0x34 Data path failover reported A data path failover event occurred The active port was successfully changed to the previous standby port This is an informational event Troubleshooting failover operation Additional tape drive sense codes Tape drives supporting advanced path failover use SCSI additional sense codes ASCs to report certain conditions to the failover drivers These additional sense codes are handled by the device driver in normal operation and should not be visible to the applications Because these ASCs may be visible in device logs and diagnostic tools they are listed in Table 9 page 65 Table 9 Advanced failover vendor specific additional sense codes ASC ASCQ Description Meaning 82h 93h FAILOVER SESSION SEQUENCE Failover is enabled but the device driver has not opened a ERROR failover capable connection to the device Check that the failover driver is installed and attempt to r
104. t might be the problematic link After correcting the connection problem refresh the diagnostic application to confirm that all of the expected failover paths are available on all devices Windows debugging logs and tools Confirming failover operation 54 To confirm that the advanced path failover drivers have installed and are operating correctly open the system event viewer See Driver components page 37 for instructions on how to filter out irrelevant events The following events should be present the first event in this list will be the first to occur after system restart HPtapeFailover filt Path failover driver loaded HPtapeFailover_mpio Path failover driver loaded Followed by one instance of the following message for each active path HPtapeFailover_mpio Path failover session established For more details on which paths are active and passive use the diagnostic application see Windows Advanced Failover Diagnostic Application page 56 Troubleshooting failover operation Windows system log The drivers create entries in the Windows system log when they are first started and whenever any exceptional conditions occur These log entries are summarized in Table 3 page 55 The symbols beginning with are strings filled in by the operating system when the log entry is generated Table 3 Event Log Entries Event Driver loaded Severity Informational Message Path failover driver loade
105. tape library and then enabled separately for every partition and tape drive The settings may be different for different partitions and drives depending on the user requirements When advanced path failover is enabled for either the control path or the data path the library partition and or tape drives with advanced path failover enabled can only be used by hosts with the advanced path failover driver installed If the tape drive or tape library detects that advanced path failover is enabled and a request to access the media or move media is received from a host 16 Installing advanced path failover that is not using an advanced path failover driver the drive or library will reject the command with an additional sense code of 82h 93h FAILOVER SESSION SEQUENCE ERROR That error code should only be reported to an application if the advanced path failover drivers are not installed on that host In a mixed environment where some hosts have advanced path failover drivers installed and some hosts do not the library should be partitioned so that one partition is accessed by hosts that are using advanced path failover and the second partition is accessed by hosts that are not using advanced path failover In some cases a mix of host operating systems might be used with a single partition For example a Windows host might be running the library control agent and another operating system is performing backups In that configuration advanced control path fail
106. that all of the configured paths are accessible to the OS If the example system shown below is used there should be two paths to each tape drive and four paths to the tape library If the expected number of paths is not available check the host and SAN configuration After all of the expected paths are available to the host the advanced path failover drivers can be installed Library ues 35 Installing the Windows advanced path failover drivers Application path list page 36 shows the device handles as presented to a Windows application when using the advanced path failover driver for the same hardware configuration shown in Advanced path failover page 11 For the drives both ports are mapped to the same device handle and one port is active while the other is the standby port For the library the two ports on the first drive are the active and standby ports and two additional ports on a second drive are passive ports that can be activated in the event of complete connection loss to the drive hosting the control path Table 2 Application path list Addressed Example Logical Unit Logical Unit Device Handle Path SAN Port Worldwide Identifier Tape drive 1 TAPEO Active 1 Port A 50 01 10 a0 00 00 00 01 Standby 2 Port B 50 01 10 a0 00 00 00 01 Tape drive 2 TAPE 1 Active 1 Port A 50 01 10 a0 00 00 00 03 Standby 2 Port B 50 01 10 a0 00 00 00 03 Library controller CHANGERO Activ
107. the second port connected into SAN 2 The library in this example has two different drives which are both configured to provide a library control path Each drive that is configured to provide a library control path will connect to the SAN as two devices a tape drive and a library controller at two different SCSI logical units The list of paths available at one of the servers is shown in Example path list page 12 In this table the SAN that contains the path is listed in the first column and the following columns show what device is being addressed for example the SCSI logical unit the port on the drive that is being accessed an example SCSI address and the worldwide identifier such as a Fibre Channel worldwide node name of the addressed logical unit The unique portion of the worldwide identifier is highlighted Advanced path failover Table 1 Example path list Example Logical Unit Worldwide SAN _ Addressed Logical Unit Port Example SCSI address Identifier 1 Tape drive 1 Port A ID 1 LUN O 50 01 10 a0 00 00 00 01 1 Library Controller Port A ID 1 LUN 1 50 01 10 a0 00 00 00 02 2 Tape drive 1 Port B ID 2 LUN O 50 01 10 a0 00 00 00 01 2 Library Controller Port B ID 2 LUN 1 50 01 10 a0 00 00 00 02 1 2 Port A ID 3 LUN O 50 01 10 a0 00 00 00 03 1 Library Controller Port A ID 3 LUN 1 50 01 10 a0 00 00 00 02 2 Tape drive 2 Port B ID 4 LUN O 50 01 10 a0 00 00 00 03 2 Libra
108. ths to the drive hosting the library controller have failed the advanced path failover driver is capable of opening a connection to the library controller through another tape drive The library control path is hosted by a tape drive which maintains some state information on behalf of the library controller The state information maintained by the tape drive includes reservations media removal restrictions and may contain special mode settings Any time that the library state changes the library notifies the advanced path failover driver that a state change has occurred and then the advanced path failover driver retrieves a cache of the state information When all paths to the drive that was hosting the library control path fail the advanced path failover driver will connect to a different drive and configure the new drive as the preferred control path drive After activating a passive control path drive the path failover driver will download the state information from the previous control path drive The newly activated control path drive will notify the library controller that the preferred control path drive has changed and the library will disable the previous control path drive Any servers still connected to the original control path drive are notified that the preferred control path drive has changed and the advanced path failover driver on those servers will automatically change the preferred path for future commands to the new preferred cont
109. ut Library Control Path Failover before checking this option read the Help pages for configuration settings that are required before Library ontrol Path Failover can be enabled been met and the library has made the option for Enable Library Control Path Failover selectable as well as providing a selection for the Alternate Drive for Library Control Path Configuring basic control path failover 33 Figure 14 Configure library basic control path failover configuration available Select Language English Y Enable Extended Mode Warning Read the Help page for more information about Enable Extended Mode before checking this option Enable Library Control Path Failover Read the Help page for more information about Library Control Path Failover before checking this option Alternate Drive for Library Control Path p 2 A gt Configuration requirements after enabling control path failure When basic control path failover is enabled the library is no longer presented as a logical unit behind the tape drive and is assigned a new Fibre Channel node name Verifying basic control path failover After enabling basic control path failover verify the configuration of both paths To verify both paths first verify that the hosts configured for access to the library are able to communicate with the library The library Worldwide Node Name might need to be added to switch zones before the library is accessible After the host access has
110. uter Disk drives Medium Changer devices HP ESL G3 Series Tape Library n Mice and other pointing devices E Monitors Network adapters YI Ports COM amp LPT Processors lt gt Storage controllers System devices ME mW Ds Tape drives 8 Hewlett Packard LTO Ulltrium 6 drive Hewlett Packard LTO Ultrium 6 drive Universal Serial Bus controllers ACPI Fixed Feature Button ACPI Thermal Zone AdvFO Tape Multi Path Intermediate Class Driver ROOT FDO AdvFO Tape Multi Path Intermediate Class Driver SCSI FDO AdvFO Tape Multi Path Intermediate Class Driver SCSI FDO AdvFO Tape Multi Path Intermediate Class Driver SCSI FDO AdvFO Tape Multi Path Intermediate Class Driver SCSI FDO AdvFO Tape Multi Path Intermediate Class Driver SCSI FDO AdvFO Tape Multi Path Intermediate Class Driver SCSI FDO AdvFO Tape Multi Path Intermediate Class Driver SCSI FDO AdvFO Tape Multi Path Intermediate Class Driver SCSI FDO AdvFO Tape Multi Path Intermediate Class Driver SCSI FDO AdvFO Tape Multi Path Intermediate Class Driver SCSI FDO Composite Bus Enumerator Direct memory access controller Extended IO Bus Device firmware 42 These two Windows drivers work in conjunction with firmware in the library and tape devices The special firmware ensures that the host computer and devices stay synchronized on state and position information The advanced path failover device d
111. ve that is in basic control path failover available for control path failover Reconfigure the partition so that at least one drive in the partition is available for control path failover 4057 Passive control path drive not available for control Verify that the configured control path failover drive path failover is present powered on and ready to accept the control path 4058 Disabling active control path drive caused failover If the failover is unplanned or unexpected verify to passive one This event applies to Basic CPF that the host still sees both the active and passive drives If necessary reconfigure a different passive drive for the partition 4066 Automatic control path failover by disabling LUN Check cabling and all network components between drive failed partition may be disconnected from affected drive and host computer host 9040 Control path switched over from active to passive This event code is used when the user initiates the drive failover from the library web interface This is an informational event Library path failover events 63 04 Table 8 MSL library events related to path failover Event code Description Details and Solution EC Unable to negotiate for NPIV Library control path The port of the FC switch connected to the library failover has been disabled master drive must be in NPIV mode Verify the FC switch configuration ED Common control or data path failover i
112. ves 50 finding the lockdown path 51 installing advanced path failover drivers 48 troubleshooting 51 viewing device status 48 HP UX patches 48 installing advanced path failover 16 preparing the SAN 16 L linux command line user interface 44 downloading advanced path failover drivers 43 installing advanced path failover drivers 43 setting the preferred path 45 theory of operation 46 updating advanced path failover drivers 43 viewing current driver revision 44 viewing device status 44 Linux logs 61 Linux path rotation exercise function 46 log files Linux 61 Linux trace log 62 Windows system log 55 M MSL2024 MSL4048 MSL8048 MSL8096 configuring control path failover 32 configuring data path failover 31 enabling control path failover 32 74 Index enabling data path failover 31 failover events 64 verifying control path failover 34 verifying data path failover 31 MSL6480 configuring control path failover 27 configuring data path failover 29 enabling control path failover 27 enabling data path failover 29 failover events 63 verifying control path failover 28 verifying data path failover 30 N NPIV 11 P prerequisites advanced path failover 18 B series switches 19 C Series switches 19 H Series switches 19 basic path failover 18 Brocade switches 18 Cisco switches 19 R reseller HP 68 5 SAN configuring redundant connections 16 minimizing host access
113. vice detection e Applications on hosts may need to be reconfigured to recognize the new library world wide name Configuring control path failover 25 Verifying control path failover Before testing control path failover verify that the configuration is correct in the Drive Status dialog which is accessed from the Monitor Drives menu The Control Path column identifies the primary and secondary control path drives The drive currently hosting control path access is marked Active y Drive Statu Link Status Link Status P2 Ade ame Ade test basic control path failover 1 2 3 4 From the Physical managed view select Monitor Partitions Control Path Select the partition with basic control path failover configured The Control Path dialog for the partition appears Click Failover In the Warning dialog click Yes NOTE Since the control path is switching from the primary drive to the secondary drive there could be a disruption in host traffic A progress dialog appears while the failover operation is in progress Select Monitor Drives to launch the Drive Status dialog The Secondary drive should now be the Active drive 8 x Type WWNN WWPN Por 1 WWPN 2 Link Status P1 Link Status P2 Health Control Path Data Path Failover Firmware level Barcode Location Physic
114. w hp com go ebs For the highest level of fault protection connect two different HBAs in the host to two different SANs This configuration provides full fault tolerance from both an HBA failure and a SAN switch failure If a single HBA is used an HBA failure might result in loss of connection The advanced path failover driver for Windows selects the first path it discovers If you want the driver to select a particular SAN path configure the host so that the HBA for your preferred path is installed in the position with the lowest numbered bus location Refer to your server documentation for bus location information The Linux path failover driver and the HP UX operating system have built in load balancing and when a tape drive is opened the operating system selects the best path based on the current path loading The Linux advanced path failover driver has a command for requesting a partition path to be preferred That setting will only persist until the next reboot because the hardware configuration can change when the server reboots The driver is unable to detect whether the hardware is the same as the previous boot so the preferred setting is not retained across reboots You can use a boot time script to set the preferred path at each boot when the hardware configuration is stable For persistent path binding use Linux udev rules to create persistent paths After the host has been configured and booted install the drivers necessary for the h
115. ying that the configuration change was successful verify that the hosts with access to the tape drive are still able to communicate with the drive After verifying host access via the initial path force a data path port failover by disconnecting the cable from the active port on the drive or using an FC switch management interface to down the port connected to the tape drive The drive status display shows which drive port is active and which port is in standby After disconnecting the cable from the active port verify that the library network management page port status shows that the active port has changed Reconnect the disconnected port and verify that it shows as Standby Verify that each host still has access to the tape drive IF a particular port is the preferred active port and it is configured as Standby you can force selection of a particular port as the active port by disconnecting the cable from the other port Configuring basic control path failover Enabling control path port failover on the library 32 The HP StoreEver MSL Tape libraries only support basic control path failover when used in a Fibre Channel SAN and connected as fabric devices The minimum configuration is e library or partition within a library with two LTO 5 or two LTO 6 Fibre Channel drives of the same type Ultrium 6250 half height 3000 half height or Ultrium 3280 full height All drive ports configured to use a Fabric N F connection The defau
116. you wart to be configured Click Group by Devices or Group by Hosts to switch between views Devices f ES G3 Senes 5948165 a Devices by host fee Extended Copy Group by Devices Group by Hosts o Med 2 dj HPESL G3 Soses T Redotes Pate usa ho com W 32071 d No found a HP ESL 63 Senes Mj HPESL 03 Sones U as Robotics Paths CLAIMED HP StorageWorks ES 63 Senes 4165 usa o com V 000 wv 6SCSI 1 v 126 65 usa hp com wq Tatti 5 amp HP Ute 65091 2 Tod OS 2 wm PUN 6591 3 129165 usa Fo com WOW Taee204 0C 2 HPUN 5SCSI 4 59165 usa ho com Taper 140 2 HP Ute amp SCSI 5 1961685 com v Tapet 0 0C 2 wg 65916 cow BB 1290165 usa ho com ww Tape50 8 0C When configuring devices manually Data Protector will also find all active and passive device paths for robot and drive Data Protector recognizes the paths correctly and marks all passive paths with a red x and the active path with a green check To verify Data Protector has discovered the active paths correctly the Advance Failover Diagnostic tool can be used to cross reference all paths and symbolic driver names The following example shows the Diagnostic tool display of the above library and 6 LTO drives and their associated paths 71 f Advanced Failover Diagnostics Actions Devices HP HP HP H

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