# [OmniOS-discuss] ZFS/COMSTAR - zpool reports errors

Stephan Budach stephan.budach at JVM.DE
Wed Aug 12 14:04:25 UTC 2015

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    Hi everyone,

    yesterday I was alerted about one of my zpools reporting an
    uncorrectable error. When I checked that, I was presented with some sort
    of generic error at one of my iSCSI zvols:

    root at nfsvmpool08:/root# zpool status -v sataTank
       pool: sataTank
      state: ONLINE
    status: One or more devices has experienced an error resulting in data
             corruption.  Applications may be affected.
    action: Restore the file in question if possible. Otherwise restore the
             entire pool from backup.
        see: http://illumos.org/msg/ZFS-8000-8A
       scan: scrub repaired 0 in 6h2m with 0 errors on Wed Aug 12 05:08:51 2015
    config:

             NAME                         STATE     READ WRITE CKSUM
             sataTank                     ONLINE       0 0     0
               mirror-0                   ONLINE       0 0     0
                 c1t5000CCA22BC4ACEDd0    ONLINE       0 0     0
                 c1t5000CCA22BC51C04d0    ONLINE       0 0     0
               mirror-1                   ONLINE       0 0     0
                 c1t5000CCA22BC4896Dd0    ONLINE       0 0     0
                 c1t5000CCA22BC4B18Ed0    ONLINE       0 0     0
               mirror-2                   ONLINE       0 0     0
                 c1t5000CCA22BC4AFFBd0    ONLINE       0 0     0
                 c1t5000CCA22BC5135Ed0    ONLINE       0 0     0
             logs
               mirror-3                   ONLINE       0 0     0
                 c1t50015179596C598Ed0p2  ONLINE       0 0     0
                 c1t50015179596B0A1Fd0p2  ONLINE       0 0     0
             cache
               c1t5001517959680E33d0      ONLINE       0 0     0
               c1t50015179596B0A1Fd0p3    ONLINE       0 0     0

    errors: Permanent errors have been detected in the following files:

             sataTank/nfsvmpool08-sata-03:<0x1>
    root at nfsvmpool08:/root#

    As you can see, I ran a scrub, but that one didn't find any issue with
    any of the data in the pool. Checking fmdump also revealed nothing, so I
    wonder what I am to do about that? I recall from somewhere in my head,
    that I had seen a topic like this had been discussed before, but I seem
    to cannot find it anywhere. This must have been either on this list or
    the OpenIndiana list.

    This zvol is actually part of a mirror RAC volume group, so I went to
    the RAC nodes, but neither of them notices anythinf strange as well…

    So, my main question is: how can I diagnose this further, if possible=

    Thanks,
    Stephan

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