# [OmniOS-discuss] Slow scrub on SSD-only pool

Stephan Budach stephan.budach at JVM.DE
Sun Apr 17 12:07:06 UTC 2016

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    Hi all,

    I am running a scrub on a SSD-only zpool on r018. This zpool consists of
    16 iSCSI targets, which are served from two other OmniOS boxes -
    currently still running r016 over 10GbE connections.

    This zpool serves as a NFS share for my Oracle VM cluster and it
    delivers reasonable performance. Even while the scrub is running, I can
    get approx 1200MB/s throughput when dd'ing a vdisk from the ZFS to
    /dev/null.

    However, the running scrub is only progressing like this:

    root at zfsha02gh79:/root# zpool status ssdTank
       pool: ssdTank
      state: ONLINE
       scan: scrub in progress since Sat Apr 16 23:37:52 2016
         68,5G scanned out of 1,36T at 1,36M/s, 276h17m to go
         0 repaired, 4,92% done
    config:

             NAME STATE     READ WRITE CKSUM
             ssdTank ONLINE       0     0     0
               mirror-0 ONLINE       0     0     0
                 c3t600144F090D09613000056B8A76C0001d0 ONLINE       0
    0     0
                 c3t600144F090D09613000056B8A93C0009d0 ONLINE       0
    0     0
               mirror-1 ONLINE       0     0     0
                 c3t600144F090D09613000056B8A7BE0002d0 ONLINE       0
    0     0
                 c3t600144F090D09613000056B8A948000Ad0 ONLINE       0
    0     0
               mirror-2 ONLINE       0     0     0
                 c3t600144F090D09613000056B8A7F10003d0 ONLINE       0
    0     0
                 c3t600144F090D09613000056B8A958000Bd0 ONLINE       0
    0     0
               mirror-3 ONLINE       0     0     0
                 c3t600144F090D09613000056B8A7FC0004d0 ONLINE       0
    0     0
                 c3t600144F090D09613000056B8A964000Cd0 ONLINE       0
    0     0
               mirror-4 ONLINE       0     0     0
                 c3t600144F090D09613000056B8A8210005d0 ONLINE       0
    0     0
                 c3t600144F090D09613000056B8A96E000Dd0 ONLINE       0
    0     0
               mirror-5 ONLINE       0     0     0
                 c3t600144F090D09613000056B8A82E0006d0 ONLINE       0
    0     0
                 c3t600144F090D09613000056B8A978000Ed0 ONLINE       0
    0     0
               mirror-6 ONLINE       0     0     0
                 c3t600144F090D09613000056B8A83B0007d0 ONLINE       0
    0     0
                 c3t600144F090D09613000056B8A983000Fd0 ONLINE       0
    0     0
               mirror-7 ONLINE       0     0     0
                 c3t600144F090D09613000056B8A84A0008d0 ONLINE       0
    0     0
                 c3t600144F090D09613000056B8A98E0010d0 ONLINE       0
    0     0

    errors: No known data errors

    These are all Intel S3710s with 800GB and I can't seem to find out why
    it's moving so slowly.
    Anything I can look at specifically?

    Thanks,
    Stephan

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