[OmniOS-discuss] ZFS data corruption

[Stephan Budach]

Hi,

Am 21.08.15 um 08:06 schrieb wuffers:
> Oh, the PSOD is not caused by the corruption in ZFS - I suspect it was 
> the other way around (VMware host PSOD -> ZFS corruption). I've 
> experienced the PSOD before, it may be related to IO issues which I 
> outlined in another post here:
> http://lists.omniti.com/pipermail/omnios-discuss/2015-June/005222.html
>
> Nobody chimed in, but it's an ongoing issue. I need to dedicate more 
> time to troubleshoot but other projects are taking my attention right 
> now (coupled with a personal house move time is at a premium!).
>
> Also, I've had many improper shutdowns of the hosts and VMs, and this 
> was the first time I've seen a ZFS corruption.
>
> I know I'm repeating myself, but my question is still:
> - Can I safely use this block device again now that it reports no 
> errors? Again, I've moved all data off of it.. and there are no other 
> signs of hardware issues. Recreate it?
I rember that post, but as I do not use Veem, I didn't had anything to 
contribute. From my understanding though, your issue could only be 
caused by a write-error, since why should you get a PSOD otherwise? The 
issues I had were caused by "read-erorrs", at least that was reported by 
the Linux kernel. In both cases the LUN-depth could be an issue and I 
will check with my initiator, if I should lower the queue depth.

As far as your question goes, I'd say: as long as a scrub doesn't reveal 
any issue and the zpool's state is clean, I'd use it.

>
> On Wed, Aug 19, 2015 at 12:49 PM, Stephan Budach 
> <stephan.budach at jvm.de <mailto:stephan.budach at jvm.de>> wrote:
>
>     Hi Joerg,
>
>     Am 19.08.15 um 14:59 schrieb Joerg Goltermann:
>
>         Hi,
>
>         the PSOD you got can cause the problems on your exchange database.
>
>         Can you check the ESXi logs for the root cause of the PSOD?
>
>         I never got a PSOD on such a "corruption". I still think this is
>         a "cosmetic" bug, but this should be verified by one of the ZFS
>         developers ...
>
>          - Joerg
>


Cheers,
Stephan
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