Supermicro CBL-SAST-0531 Serial Attached SCSI (SAS) cable
Contents
1. SUPERMICR Supermicro s Storage AOC Introduction Seere has been and continues to employ and deliver storage products with the latest storage technologies Supermicro s Add On Card AOC product is one example of this The product line offerings are in three categories e HBA Host Bus Adapter where each physical device i e PD is presented to OS separately If two PDs are connected to an HBA then OS will see two distinct devices e SW RAID These AOCs are very similar to the architecture which is used in the HBA except they support minimal amount of RAID features i e 0 1 and 10 Both AOC as well as mother board s i e MB resources are used to process data More than one PD can be configured into a virtual device i e VD The operating system i e OS will see VDs as distinct devices e RAID On Chip i e ROC based RAID These cards are rich in RAID features They support RAID level 0 1 10 5 6 50 and 60 This AOC contains cache memory and cache memory protection i e Battery Back Unite i e BBU or Cachevault Supecap TFM Features e HBA IT mode This AOC provides one to one mapping of PDs i e Physical Devices and exports them back to the OS It does not provide any RAID feature It supports 8 devices if it is directly connected to a DA i e Direct attached backplane that would also support 8 devices It however can support 122 or more PDs if it is connected to a backplane that uses an2. the logic in both the backplane expander FW i e Firmware software residing on the hardware and AOC s Higher number of VDs could be configured by using drive groups i e DG and expander based JBOD chassis SMCI defines JBOD as a expander based chassis that is externally available for storage scalability This card does not need cache therefore no cache protection i e BBU is required A user s guide is also available at SMCI s ftp site ftp ftp supermicro com driver SAS LSI LSI_SAS_EmbMRAID_ SWUG pdf e ROC based RAID This AOC uses RAID On Chip i e ROC chip to provide full RAID features i e RAID 0 1 10 6 5 50 60 in the form of VDs i e Virtual Devices and exports them back to the OS It supports 8 devices if it is directly connected to a DA backplane that would also support 8 devices You are allowed to have upto 8 PDs in each VD and upto 8 VDs 2014 Super Micro Computer Inc August 2014 Ss It however can support 240 or more PDs if it is connected to a backplane that uses an expander In this case you are allowed to have 240 PDs in each VD and upto 64 VDs Higher number of VDs could be configured by using an expander based JBOD chassis and drive group i e DG This card also supports cache memory for higher performance The cache memory is protected in the event of a power outage Technologies that are used to do so are the old fashion BBU or the newer Cachevault Supecap TFM The card also
3. e Cables See Cable Types below Please see Supermiro lab s result for the above configurations using iometer in windows 5128 6 63 66 72 66 62_ 66 80 66 331 65 43 66 57 __ 66 63 ake 133 68 133 23 133 30 133 59 133 66__ 133 57__ 133 29 133 33 KB 267 59 267 21 267 32 266 80 267 96 _ 267 84 267 48 267 50 ake 532 39 531 87 532 23 531 88 532 40 531 52 533 83 533 01 8KB 806 74 800 67 804 81 _ 807 22 806 31 806 23 804 67 803 91 16KB 880 90 882 52 881 16 881 69 880 21 881 77 881 17 880 91 32KB 907 55 64KB 955 49 989 26 512KB 999 67 IMB 987 97 988 57 985 66 984 63 986 01 983 14 39 2MB 97147 97344 97147 O79 19 966 36 968 49 969 37 970 50 1A1A1AL wor os ums wos aos mos mos s OO asss 2583 2580 25 77 2588 2579 2583 2581 me e 52 78 s20 52 71 52 77 52 69 52 79 s268 PKB foss 103 17 102 84 103 17 108 03 102 65 102 93 102 90 axs ero 432 02 asis 427 36 asa a132 anro 428 77 saks 7s 431 38 428 51 427 22 42632 42940 a2852 427 58 am ss a039 428 31 42634 42475 499 00 436 72 426 69 Example 2 High end configuration Let s say you need full RAID features 1 PB of storage and maximum sequential read performance of 15GB s August 2014 2014 Super Micro Computer Inc By Genes Supermicro Storage A
4. expander The higher device support is possible by using the logic in the backplane expander This AOC provides to the OS all distinct devices that it can find The OS can either use them as individual devices or use SW RAID to create OS level VDs that utilizes a desired RAID levels Higher number of devices can be configured by using just a bunch of devices i e JBOD SMCI defines this as a chassis that is externally available for storage scalability These JOBDs can be chained for scalability and grow a capacity ina enterprise software that can handle on the fly scalability such as hadoop http en wikipedia org wiki Hadoop Swift http en wikipedia org wiki OpenStack and many other OpenSource Scalable storage products This card does not need cache therefore no cache protection i e BBU is required e SW RAID IR mode This AOC provides minimal RAID features i e RAID 0 1 and 10 and exports them in the form of VDs i e Virtual Devices back to the OS Each VD is made of several PDs For example a VD could be 3 PDs that are configured as RAID O It supports 8 devices if it is directly connected to a DA backplane that would also support 8 devices You are allowed to have upto 8 PDs in each VD and upto 2 VDs It however can support 63 or more PDs if it is connected to a backplane that uses an expander In this case you are allowed to have 14 PDs in each VD and upto 2 VDs Higher number of devices are possible by using
5. supports many other features that are normally associated w a RAID card see the user s guide at http central db cds sites default files download user_guide aoc 54385 00_RevD_12Gbs_MegaRAID_SAS_SW_UserGd_v1 0 pdf All features can be set or unset at BIOS and OS command line or GUI app SMCI provides latest version of these tools at its ftp site ftp ftp supermicro com driver SAS LSI Performance amp Capacity Let s pick an earlier AOC which uses SAS 2 on PCle Gen2 w either LSI s 2008 or 2108 ASICs Let s use it as an example to calculate its maximum theoretical performance It s PCle Gen 2 side has 8 lanes at 500MB s that adds up to 4GB s i e 8X500MB s The SAS 2 side uses 8 lanes at 6Gb s which adds up to 4 8 GB s In this case maximum IO performance is dictated by the slower interface that is the card s performance bottleneck which in this case would be 4GB s Let s review the bandwidth speed for different interfaces Eight lanes of SAS 2 is 4 8GB s PCl e Gen 2 is 4GB s SAS 3 is 9 6GB s and PCl e Gen 3 is 6 4GB s Using the above calculation the following waves of AOCs represent maximum theoretical performance e First wave SAS 2 Gen 2 LSI 2008 LSI 2108 4GB s bottleneck PCle Gen 2 e Second wave SAS 2 Gen 3 LSI 2308 LS 2208 4 8GB s bottleneck SAS 2 e Third wave SAS 3 Gen 3 LSI 3008 LSI 3108 6 4GB s bottleneck PCl e Gen 3 e Fourth wave Will use PCl e Gen 4 in 2016 Please note th
6. 11 AOC USAS2 L8X Conclusion Traditionally Supermicro prides itself in high quality early development and TTM for its products Supermicro follows a series of strict ISO approved processes where product development cycles must follow before they are manufactured A strict approval method is required prior to product release The processes begin from pre concept and end at post mortem Peer review strong test procedures and early product inventory are few steps that are taken before a detail spec is presented on SMCI s website to all potential customers To assure even higher quality a final pilot run process is also put in place in Supermicro s production prior to product shipment We pride ourselves in highest level of product quality and timely delivery by employing the latest technology and complying to strict quality guidelines in all of products 2014 Super Micro Computer Inc August 2014
7. OC Dividing 1PB i e 1000TB by 6TB results in total number of HDDs which is 167 HDDs Now to achieve 15GB s Read write performance of Hitachi for SAS 2 6Gb HUS726060ALS640 is defined at http www serversupply com HARD 20DRIVES SAS 6GBITS 6TB 7200RPM HITACHI 20 HUS726060ALS640 htm to be 180 MB s for read and 180 MB s for write PERFORMANCE fives mos mos own wwe mos mu 6 80 se 61 65 05 9 23 4 66 asof asaf ras este taser ses saz Site isan aes soea raar j TT aam ara aont Toras Tear 738325 43 21753 ae a Se ee is ee aL aaeaa ARERR slala eed eel ic alaala a el st E To find out total number of drives needed to achieve 15GB s we must divide 15GB s i e 1SOOOMB s by 180 MB s This Cable types results to 84 HDDs So we need 167 HDDs to achieve 1PB of capacity and 84 of these drives will provide the required AOCs and backplanes connect to each other in a variety of configurations performance of 15GB s Since we need more than 8 devices To understand how to select the correct cable types you must know what to achieve our desired requirements we must use an connector type is required on each side i e AOC being on one side and expander based backplane SMCI s ROC based AOC supports at least 240 devices when used with an expander Again backplane being on the other side First let s cover the backplane side There are three types of backplane nomenclatures that
8. a SAS 3 AOC to a SAS 2 A type DA backplane That means you need a cable that has SFF 8643 on the AOC side and SFF 8087 on the backplane side SMCI offers variety of cable length for this Below are a few 1 AOC S3008L L8e 2 AOC S3008L L8i 3 AOC S3108L H8iR 4 AOC S2308L L8e 5 AOC S2308L L8i 6 AOC S2208L H8iR 7 AOC SAS2LP MV8 8 AOC SAS2LP H4iR 8 internal ports low profile 12Gb s per port Gen 3 1024HDD 8 internal ports low profile 12Gb s per port Gen 3 512HDD 8 internal ports low profile 12Gb s per port Gen 3 240HDD ROC 8 internal ports low profile 6Gb s per port Gen 3 122HDD 8 internal ports low profile 6Gb s per port Gen 3 63HDD 8 internal ports low profile 6Gb s per port Gen 3 240HDD ROC 8 internal ports low profile 6Gb s per port Gen 2 4 internal amp 4 external ports IT mode RAID 0 1 1E IR mode RAID 0 1 5 6 10 50 60 HBA IT mode RAID 0 1 1E IR mode RAID 0 1 5 6 10 50 60 HBA IT mode RAID 0 1 5 6 10 50 60 low profile 6Gb s per port Gen 2 240HDD ROC 8 internal ports low profile 6Gb s per port Gen 2 240HDD ROC 8 internal ports low profile 6Gb s per port Gen 2 240HDD ROC 8 internal ports low profile 6Gb s per port Gen 2 9 AOC SAS2LP H8iR RAID 0 1 5 6 10 50 60 10 AOC USAS2LP HBiR RAID 0 1 5 6 10 50 60 X i RAID 0 1 1E IR X e HBA IT X iR RAID 0 1 10 5 SR
9. e actual performance is always approximately around 30 less than the theoretical performance This is due to deficiencies in logic used in FW driver and OS Let s use the following two realistic examples to achieve a desired capacity and performance Example 1 Low end configuration Let s say you do not care about capacity and do not need any RAID features but need to achieve total read Supermicro Storage AOC performance of 5GB s You need to first calculate total number of HDDs SSDs that can yield 5GB s Read write spec on performance of Toshiba s SAS 3 12gb PXO2SMF020 s is defined at http www cdw com shop products Toshiba PXO2SMF020 solid state drive 200 GB SAS 3 3203414 aspx TS to be 900MB s for sequential read and 400MB s for sequential write Now to find out total number of SSDs you must divide 5GB s or 5000MB s desired by 900 read which is 5 5 SSDs This means you will need 6 SSDs SMCI s HBA AOC IT mode supports up to 8 direct attached devices You will not need an expander base chassis Remember expanders are used when you need more than 8 devices You need a DA based chassis The HBA can realistically perform around 5GB s So now your HW configuration to achieve 5GB s read will be as below e One SAS 3 Gen 3 HBA AOC SKU is AOC S3008L L8e e 6X Toshiba SAS 3 12Gb PXO2SMF020 SSDs e Any SAS 3 Supermico DA backplane that supports at least 6 devices i e SKU is BPN SAS3 216A or BPN SAS3 116A
10. ro Storage AOC 3 SAS 3 A backplanes DA uses mini HD connectors i e SFF 8643 CBL SAST 0531 Internal Mini SAS HD to Mini SAS HD 80cm 30AWG 12Gb s CBL SAST 0532 Internal Mini SAS HD to Mini SAS HD 50cm 30AWG 12Gb s CBL SAST 0550 Internal Mini SAS HD to Mini SAS HD 25cm 30AWG HF ROHS REACH SKUs and model names 4 SAS 2 Expander backplanes uses mini SAS ipass connectors i e SFF 8087 5 SAS 3 Expander backplanes uses mini SAS HD connectors i e SFF SFF 8643 Below I will describe AOC s cable types 1 SAS 2 storage AOCs uses mini SAS ipass connectors i e SFF 8087 2 SAS 3 storage AOCs uses mini SAS HD connectors i e SFF 8643 Please note that there are external versions of the above cable connectors not mentioned in this white paper To determine cable types we need to know which AOC is connected to which backplane You can then use the above to determine the correct cable type Two examples are described below to explain how to do this Example 1 Desired configuration is to connect a SAS 3 AOC to a SAS 2 A type DA backplane That means you need a cable that has SFF 8643 on the AOC side and SFF 8087 on the backplane side SMCI offers variety of cable length for this Below are a few CBL SAST 0507 01 Internal Mini SAS to Mini SAS HD 80cm w SB 28AWG Internal Mini SAS to Mini SAS HD 50cm w SB 30AWG CBL SAST 0508 01 Example 2 Desired configuration is to connect
11. use the letters TQ and A for DA backplane and E for expander backplane Below will remember expanders are used when you need more than 8 devices This AOC can realistically perform at least around PERCO Wack plaMes CADETE 5GB s So now your HW configuration to achieve 15GB s read 1 TO backplanes DA uses discrete SATA connectors performance and 1PB capacity will be as below Discrete SATA e 4XSAS 3 Gen 3 ROC AOC Total number of AOCs are derived from total number of chassis needed see below SKU is AOC S3108L H8iR e 167 Hitachi HUS726060ALS640 SAS 2 6Gb PXO2SMFO20 SSDs e 4X847 supermico JBOD chassis that use expander backplanes each supports 45 devices To get total of JBODs needed for 167 HDDs divide 167 HDDs by 45 HDDs which is 4 JBODs SKU is 847E1C R1K28JBOD 2 SAS 2 A backplanes DA e Cables See Cable Types below uses mini SAS ipass connectors i e SFF 8087 Supermicro lab s report shows that using a RAID level 0 you can get a realistic performance of slightly above 4GB s for both sequential read and write per chassis See below ae sej mwn rai woe ees mes oo erar eee tease terse aie rt 2104s aimee rzer aoa ra isser aaae 29028 aessa asti sores ae 76 BEE serso avaze ezene ese 2a ease e035 aaa PS PN 2014 Super Micro Computer Inc August 2014 Ss Supermic
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