# [OmniOS-discuss] Hung ZFS Pool

Brian Hechinger wonko at 4amlunch.net
Wed Dec 9 13:14:17 UTC 2015

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    So I decided to do some testing on the pool I have that is made up of a pair of Samsung 851 NVMe drives.

    I’ve got it partitioned as I’m using part of it to test as SLOG against the “spinning rust pool”. Yes I know these aren’t ideal for this, but they will do for now.

    I setup the other slices as a mirror and ran iozone against it.

    It wrote fast. Really fast.

    Then it stopped.

    Now the pool seems to be wedged. At first I thought it might be the drives themselves, but I see them still functioning as SLOG just fine, so it’s not that I don’t believe.

    root at basket1:/root# zpool status -v zoom
      pool: zoom
     state: ONLINE
    status: One or more devices are faulted in response to IO failures.
    action: Make sure the affected devices are connected, then run 'zpool clear'.
       see: http://illumos.org/msg/ZFS-8000-HC
      scan: none requested
    config:

            NAME          STATE     READ WRITE CKSUM
            zoom          ONLINE       0     0     1
              mirror-0    ONLINE       0     0     6
                c4t1d0s1  ONLINE       0     0     6
                c5t1d0s1  ONLINE       0     0     6

    errors: List of errors unavailable (insufficient privileges)
    root at basket1:/root# ls /zoom/
    iozone.DUMMY.0  iozone.DUMMY.10  iozone.DUMMY.12  iozone.DUMMY.14  iozone.DUMMY.2  iozone.DUMMY.4  iozone.DUMMY.6  iozone.DUMMY.8
    iozone.DUMMY.1  iozone.DUMMY.11  iozone.DUMMY.13  iozone.DUMMY.15  iozone.DUMMY.3  iozone.DUMMY.5  iozone.DUMMY.7  iozone.DUMMY.9
    root at basket1:/root# touch /zoom/hi

    So read access appears to be ok. Writes are totally boned, however.  That touch just hangs forever.

    So what do I need to do to provide you all with the information you need to diagnose this.

    Thanks!

    -brian

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