# [OmniOS-discuss] ZFS data corruption

Joerg Goltermann jg at osn.de
Mon Aug 17 12:04:05 UTC 2015

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    Hi,

    we have the same problems. First time it occurs about 6 month
    ago, I wrote several mails on the zfs list but I was not able
    to solve the problem.

    The last mail was http://permalink.gmane.org/gmane.os.illumos.zfs/4883
    I tried to debug the issue, but my zfs knowledge is not deep enough.

    Hopefully we can solve this nasty thing now ....

    In my case I am quite sure this is not a real corruption, it's a retry
    with "strange" flags which caused my "errors". Maybe this IO is very
    slow, which can cause problems on the hosts, but i have never seen
    any real problems....

    Kind regards,

    Joerg Goltermann

    On 16.08.2015 19:11, Stephan Budach wrote:
    > Am 15.08.15 um 04:23 schrieb wuffers:
    >> My scrub actually cleared the error, so I don't think it's similar.
    >>
    >> So my question remains.. is this block storage compromised or now
    >> marked safe to use?
    >>
    >> On Fri, Aug 14, 2015 at 12:21 PM, Michael Rasmussen <mir at miras.org
    >> <mailto:mir at miras.org>> wrote:
    >>
    >>     On Fri, 14 Aug 2015 12:08:05 -0400
    >>     wuffers <moo at wuffers.net <mailto:moo at wuffers.net>> wrote:
    >>
    >>     >
    >>     > Should I trust this? I suppose that now that I've moved all the
    >>     data on it
    >>     > there can be no corruption at ZFS level (since I didn't find any
    >>     hardware
    >>     > issues in iostat or fmdump logs). Or would the consensus be to
    >>     delete this,
    >>     > recreate it and present it to VMware again?
    >>     Are there any resemblance to this thread with subject:
    >>     [OmniOS-discuss]
    >>     ZFS/COMSTAR - zpool reports errors
    >>
    >>     --
    >>     Hilsen/Regards
    >>     Michael Rasmussen
    >>
    > So, did your first scrub reveal any error at all? Mine didn't and I
    > suspect, that you issued a zpool clear prior to scrubbing, which made
    > the errors go away on both of my two zpools…
    >
    > I'd say, that you had excatly the same error as me.
    >
    > Cheers,
    > Stephan
    >
    >
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