[OmniOS-discuss] ISCSI SSD Performance

[Michael Palmer]

What ssd are you using?

Sent from my iPhone

On Feb 16, 2013, at 8:18 AM, Grant Albitz <GAlbitz at albitz.biz> wrote:

  Hi I am trying to track down a performance issue with my setup.



I have 24 ssds in 6 vdevs (4 drives per) that are then striped. Essentially
a raid50. Originally I had a perc h310 and saw similar numbers. I have
since switched to a perch h710 and have each drive in raid 0 and presented
to the os. In both cases the numbers are the same. I also tried 8 devices
per vdev with only 3 vdevs and the numbers were also the same.I am thinking
I am tracking down a zfs tunable but I am not sure what to try. My reads
are ½ of my writes. Given a raid 50 I was expecting the opposite. The
volume is being presented as an iscsi lun. The benchmarks below were run
from a vmware guest. The esxi host is connected to the iscsi target via a
10g interface (direct connection).



There is no l2arche, but the entire pool is ssd..





-----------------------------------------------------------------------

CrystalDiskMark 3.0.2 x64 (C) 2007-2013 hiyohiyo

                           Crystal Dew World : http://crystalmark.info/

-----------------------------------------------------------------------

* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]



           Sequential Read :   361.519 MB/s

          Sequential Write :   690.307 MB/s

         Random Read 512KB :   298.297 MB/s

        Random Write 512KB :   517.125 MB/s

    Random Read 4KB (QD=1) :    19.731 MB/s [  4817.0 IOPS]

   Random Write 4KB (QD=1) :    18.025 MB/s [  4400.7 IOPS]

   Random Read 4KB (QD=32) :   174.766 MB/s [ 42667.5 IOPS]

  Random Write 4KB (QD=32) :   209.150 MB/s [ 51061.9 IOPS]



  Test : 50 MB [C: 10.8% (32.3/299.7 GB)] (x1) <0Fill>

  Date : 2013/02/16 11:07:10

    OS : Windows 8 Professional [6.2 Build 9200] (x64)







-----------------------------------------------------------------------

CrystalDiskMark 3.0.2 x64 (C) 2007-2013 hiyohiyo

                           Crystal Dew World : http://crystalmark.info/

-----------------------------------------------------------------------

* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]



           Sequential Read :   351.646 MB/s

          Sequential Write :   652.356 MB/s

         Random Read 512KB :   287.946 MB/s

        Random Write 512KB :   468.861 MB/s

    Random Read 4KB (QD=1) :    19.915 MB/s [  4862.2 IOPS]

   Random Write 4KB (QD=1) :    17.263 MB/s [  4214.7 IOPS]

   Random Read 4KB (QD=32) :   169.849 MB/s [ 41466.9 IOPS]

  Random Write 4KB (QD=32) :   189.730 MB/s [ 46320.8 IOPS]



  Test : 100 MB [C: 10.8% (32.2/299.7 GB)] (x1) <0Fill>

  Date : 2013/02/16 11:05:07

    OS : Windows 8 Professional [6.2 Build 9200] (x64)



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