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

Michael Rasmussen mir at miras.org
Wed Aug 12 15:19:38 UTC 2015

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    On Wed, 12 Aug 2015 16:50:49 +0200
    Stephan Budach <stephan.budach at JVM.DE> wrote:

    > Ahh… that was too soon… ;) Actually one of the RAC nodes noticed an
    > error at or rather a couple of mintues before this issue, when it
    > reported this:
    >
    > Aug 11 20:25:04 btierasm01 kernel: sd 75:0:0:1: [sdx] Unhandled sense code
    > Aug 11 20:25:04 btierasm01 kernel: sd 75:0:0:1: [sdx] Result:
    > hostbyte=invalid driverbyte=DRIVER_SENSE
    > Aug 11 20:25:04 btierasm01 kernel: sd 75:0:0:1: [sdx] Sense Key : Medium
    > Error [current]
    > Aug 11 20:25:04 btierasm01 kernel: sd 75:0:0:1: [sdx]  Add. Sense:
    > Unrecovered read error
    > Aug 11 20:25:04 btierasm01 kernel: sd 75:0:0:1: [sdx] CDB: Read(10): 28
    > 00 60 b2 54 28 00 00 80 00
    > Aug 11 20:25:04 btierasm01 kernel: end_request: critical target error,
    > dev sdx, sector 1622299688
    > Aug 11 20:25:04 btierasm01 kernel: end_request: critical target error,
    > dev dm-25, sector 1622299688
    > Aug 11 20:25:04 btierasm01 kernel: ADVMK-0020: A read error was reported
    > to the ASM instance for volume vg_nfs07fwd-16 in diskgroup DG_NFS07SA
    >
    > This vg_nfs07fwd-16 is a RAC volume, which is presented via NFS from the
    > RAC cluster nodes to some Oracle VM hosts, but neither of those hosts
    > had any issues with that volume at any time, so I assmume  the request
    > came from the RAC node itself and I will dig into the logs to see, what
    > it actually treid to do with the volume.
    >
    > I am still wondering if this issue is somewhat related to COMSTAR or the
    > zpool itself.
    >

    I wonder whether this is a hardware issue (eg driver firmware). What if
    the firmware has marked a sector bad and have moved it elsewhere. Could
    one imagine that this move have taking place unnoticed to ZFS?

    --
    Hilsen/Regards
    Michael Rasmussen

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