5 Replies Latest reply on Jul 29, 2009 2:21 AM by VirtualKenneth

    PVSCSI  adapter performance.

    Gintonic Enthusiast

      Hello!

      I have held testing and find out that PVSCSI  adapter performance is not fine like I want.

      Platform: ESX 4.0 evaluate on Intel SR2500 with Xeon 5420, 32GB RAM and SRCSASRB RAID controller with 3 SATA (Seagate 500GB) drives in 5RAID.

      There is single VM on this host: Win 2003 x64 Std with 8Gb RAM and 2 CPU.

      I used SQLIO tool for my tests:

      sqlio -kR -s120 -frandom -o8 -b8 -LS -Fparam.txt

      param.txt is one string - e:\testfile.dat 2 0x0 512

      First test:

      One boot hard disk on LSI Parallel SCSI controller (SCSI 0:0) and one tested drive(NO independent) on PVSCSI  adapter (SCSI 1:0).

      Results:

      IOs/sec:   503.25

      MBs/sec:     3.93

      latency metrics:

      Min_Latency(ms): 0

      Avg_Latency(ms): 31

      Max_Latency(ms): 924

      Second test:

      One boot hard disk on LSI Parallel SCSI controller(SCSI 0:0) and one tested drive(independent and persistent as here http://kb.vmware.com/selfservice/viewContent.do?externalId=1010398&sliceId=1) on PVSCSI  adapter(SCSI 1:0)

      Results:

      IOs/sec:   499.71

      MBs/sec:     3.90

      latency metrics:

      Min_Latency(ms): 0

      Avg_Latency(ms): 31

      Max_Latency(ms): 763

      Third test:

      One boot hard disk on LSI Parallel SCSI controller(SCSI 0:0) and one tested drive on another LSI Parallel SCSI controller (SCSI 1:0).

      IOs/sec:   614.19

      MBs/sec:     4.79

      latency metrics:

      Min_Latency(ms): 0

      Avg_Latency(ms): 25

      Max_Latency(ms): 704

       

      Performance of LSI Parallel SCSI controller is greater then  PVSCSI! Somebody knows why so?