1. John.popplewell@icl.comAXIS 2001 1 EMC Performance John Popplewell ICL Distinguished Engineer john.popplewell@icl.com

2. John.popplewell@icl.comAXIS 2001 2 Disclaimer EMC have two product ranges –Symmetrix –Clariion –This presentation is primarily about Symmetrix An EMC system is an intelligent piece of software controlling a cache, controlling industry standard discs. Two aspects to its performance –FC or Trimetra Controller Cabinet performance –EMC cache performance Outside the scope of this presentation

3. John.popplewell@icl.comAXIS 2001 3 EMC Overview EMC models –Symmetrix32 Gb cache –Clariion0.5 Gb cache ICL processor models –DL & Nova– direct FC connect –SY- connect via ICL peripheral controller (SDS3) Clariion => DL & Nova Symmetrix =>SY & Nova & DL

4. John.popplewell@icl.comAXIS 2001 4 EMC Storage What does it provide? Disc Storage –Guaranteed availability Symmetrix Raid 1 & Raid S* Clariion [Nova & DL] Raid 1/0 – mirrored and striped (64 kb) –Good performance Multi platform support within one box –Common storage –Flexibility - investment protection Fast data copying –Background volume copies (BCV’s) –Offline archiving Business Continuity –Remote mirrors (SRDF-Symmetrix Remote Data Facility) [* Raid S not supported on VME ]

5. John.popplewell@icl.comAXIS 2001 5 EMC Symmetrix Connection to VME SY

6. John.popplewell@icl.comAXIS 2001 6 EMC Symmetrix Connection to VME NOVA & DL Fibre channel VME Connection IOP Channel Directors (CDs) forVME connection (paired for resilience) Remote Link Channel Directors (RLDs), for SRDF (paired for resilience) SRDFlinks (dark fibre), external converters needed to use E3/ATM links etc VME System Groups of VME Logical Volumes (mirrored for resilience) & their (optional)BCVs Symmetrix CD (Escon) CD (Escon CD (RLD) CD (RLD) Log Vol BCV Copy Node Phone Home Switch IOP

7. John.popplewell@icl.comAXIS 2001 7 EMC Configurations –Capacity –Connectivity –Performance Any SDS3/EMC configuration must be addressed from the three points of:

8. John.popplewell@icl.comAXIS 2001 8 EMC Symmetrix Model range 84308730 Minimum number of physical discs 816 Maximum number of physical discs 96384 Type of disc18GB, 36GB, 73GB

9. John.popplewell@icl.comAXIS 2001 9 SDS3/EMC Capacity Work out the amount of filestore require to replace the existing discs EMC physical volume –18, 36 or 73 Gb –Nova Configured as 4 or 9Gb logical volumes –SY Configured as 9Gb logical volumes –DL Configured as 4Gb logical volumes –Each VME 9 Gb logical volume contains ~ 8 Gb VME is a variable block architecture, therefore 2048 bytes requires 5 * 512 byte fixed blocks Red tape, headers trailers etc. Capacity is block size dependant

10. John.popplewell@icl.comAXIS 2001 10 EMC Capacity 0 2048 ` 10k

11. John.popplewell@icl.comAXIS 2001 11 EMC Connectivity Cache Channel directors Disc directors x discs per bus (depends on Symmetrix type) 4 buses per disc director EMC view 4 SCSI per channel director BUS

12. John.popplewell@icl.comAXIS 2001 12 VME SY - EMC Connectivity EMC Symmetrix are connected to VME-SY via a Trimetra Controller cabinet Each TCC contains 4 controllers Controllers are organised in pairs A controller pair supports 32 9 Gb logical volumes The EMC systems are configured with varying numbers of channel directors. Each channel director supports 4 SCSI interfaces. Each controller pair requires two SCSI connections in different channel directors.

13. John.popplewell@icl.comAXIS 2001 13 VME SY - EMC Connectivity Use fully populated Trimetra Controller cabinets No resilience benefit in configuring two cabinets with 1 controller pair, rather than one cabinet with two controller pairs unless the cabinets are in different rooms Smartfibre recommendations –No more than 4 controllers per Smartfibre Same controller connectivity rules as existing VME controllers, i.e. a SDS controller can be attached to a single or multi-node system, or a partitioned system An EMC channel director can connect to more than 1 VME system.

14. John.popplewell@icl.comAXIS 2001 14 SDS/EMC Performance SDS Controller performance TypeIOP’sControllers / controllercabinet SDS Mk3~6004 Depends a lot on the blocksize (above for reasonable response times, i.e. less than 30 msec response times for 2 Kb xfer) Safe figure is 250 IO’s second per controller 4 Controllers per Cabinet 64 spindles per cabinet Therefore, a safe figure is ~15 IO’s per second per spindle

15. John.popplewell@icl.comAXIS 2001 15 Disc Performance

16. John.popplewell@icl.comAXIS 2001 16 SDS3/EMC Performance CAFS –4 CAFS controllers per Trimetra Controller Cabinet –Searching speed is a function of hit rate, record size etc. –Rates in Mb / sec hit rateSDS3SA300T & SA300 Min20%2.56 3.4 Ave6.1 6.9 Max0%6.6 7.5

17. John.popplewell@icl.comAXIS 2001 17 EMC Performance DiscGbDisc Index SA1001.432.06 SA2002.881.77 SA300 (4.3)4.31.99 SA300 (9)9.01.95 SA1502.152.25 SA300T(9)9.01.86 SA300T(4)4.02.08 LY Disc (9)9.01.63 LY Disc (4)4.01.80 EMC (SDS3)32 (36)4.68 assuming 80 % cache hits EMC (SDS3)8 (18)4.97 assuming 80 % cache hits GI202.881.54 GI30(4)4.01.88 GI30(9)9.01.70 ESS0.654.34 FDS20G2.31.14 FDS50001.271.00 FDS25000.621.05 FDS7600.761.01 FDS3000.310.91 Mixture of serial, random and different block sizes

18. John.popplewell@icl.comAXIS 2001 18 EMC Performance Benchmark results –Runtime Heavy IO ~30% of original time Typically~70% of original time OCP dominant ~100% of original time –BCV Establishment Depends on number of drives etc. Establish (measured)32 * 9Gb volumes ~ 75 mins Establishment done in parallel Therefore done 36 Gb in 75 mins rate is 8 Mb/sec (Ultrafast SCSI nominal 40 Mb/sec) Disc rate ~10 => 15 Mb/sec Split BCV from 1 st system and introduce into 2 nd system ~ 5 mins

19. John.popplewell@icl.comAXIS 2001 19 EMC Q&A’s Q1 Mainframe attach –“Can a SDS controller attach to two VME Systems” –While an EMC system can attach to more than one system, each SDS controller can attach to a single or multinode system - or a partitioned multinode system

20. John.popplewell@icl.comAXIS 2001 20 EMC Q&A’s Q2RAID –Is RAID1 (mirroring) standard? Yes –Is RAID S supported No

21. John.popplewell@icl.comAXIS 2001 21 EMC Q&A’s Q3VME / IDMS Duplexing or SRDF? –Discuss ! IDMS or VME 1 read and two writes through SDS3 controller With single EMC frame, twice as much data in EMC cache EMC Mirroring 1 read and 1 write through the SDS3 controller Propose VME Systems distributed < 2Km VME or IDMS plexing rather than EMC SRDF Each site will have processors, Smartlans, Internodes etc With EMC mirroring, 4 copies of data VME systems distributed > 2 Km Use EMC SRDF Need alternative system at remote end Min of 3 copies of data, probably 4

22. John.popplewell@icl.comAXIS 2001 22 EMC Q&A’s Q4CAFS –“Does CAFS work and what rate can we expect” –Yes, CAFS works, low hit rate comparisons ControllerEMCRate SA300  7.5 Mb/sec SDS2  4.7 Mb/sec SDS3  6.6 Mb/sec

23. John.popplewell@icl.comAXIS 2001 23 EMC Q&A’s Q5 Facilities –SRDF (non sys discs)  –BCV’s  –IPL  –SRDF & Sys discs 

24. John.popplewell@icl.comAXIS 2001 24 EMC Q&A’s Q6VME Release –“What release of VME is required?” –OVME2 onwards –EMC is SY only

25. John.popplewell@icl.comAXIS 2001 25 EMC Q&A’s Q7BCV issues –Outside the control of VME –BCV’s of a total system are OK –Catalogue and FLF contain information –BCV’s of part of a system (application) are possibly fraught with danger -think –Careful filestore design

26. John.popplewell@icl.comAXIS 2001 26 EMC Q&A’s Q8Hot spares –“are these included in the limit of 96 or 384 discs physical discs?” –Yes and No, they are invisible to VME however, the customer has to purchase the hot spares, so beware if fully populating boxes why buy them -- speedy availability

27. John.popplewell@icl.comAXIS 2001 27 EMC Summary Disc Storage –Guaranteed availability (Raid 1 & Raid S***) –Good performance Multi platform support within one box –Common storage –Flexibility - investment protection Fast data copying –Background volume copies (BCV’s) –Offline archiving Business Continuity –Remote mirrors (SRDF-Symmetrix Remote Data Facility) [**** Raid S not available on VME ]