# [OmniOS-discuss] [developer] NVMe Performance

Josh Coombs jcoombs at staff.gwi.net
Fri Apr 8 20:35:38 UTC 2016

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    Did some digging myself trying to find out the block size of the DC P3600
    line and found that intel only specs the 400GB unit at 500MB/s for
    sequential writes, every other model in the DC line does 1000MB/s minimum.
    So the numbers I'm seeing are in line with what they should be capable of.

    So, I have to re-eval using them as log/cache devices as they potentially
    are going to be a bottle neck.  At least now I know it's not the OS it's
    the Hardware that's causing the numbers I saw.  Sorry for the false alarm.

    Josh C

    On Fri, Apr 8, 2016 at 4:16 PM, Steven Hartland <killing at multiplay.co.uk>
    wrote:

    > As a data point for you I just tried this on our NVMe box here and got:
    > dd if=/dev/zero of=bigfile1 bs=1M count=10240
    > 10240+0 records in
    > 10240+0 records out
    > 10737418240 bytes transferred in 4.088757 secs (2626083707 bytes/sec)
    >
    > So ~2.6GB/s setup is a RAID2Z on 6 x Intel SSDPE2MD400G4 running FreeBSD
    > 10.2.
    >
    > During the test each disk does about 600-800MB/s
    >
    >     Regards
    >     Steve
    >
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