XFS corruption with failover

[Felix Blyakher]

On Aug 13, 2009, at 4:17 PM, Emmanuel Florac wrote:

> Le Thu, 13 Aug 2009 15:17:22 -0500 vous écriviez:
>
>> Any advice or insight into what we're doing wrong would be very much
>> appreciated.  My apologies in advance for the somewhat off-topic
>> question.
>
> By killing abruptly the primary server while doing IO, you're probably
> pushing the envelope...

I don't think it's pushing too much. XFS was designed to
survive such events.

> You may have a somewhat better luck with a
> cluster fs, OCFS2 works very well for me usually (GFS is a complete
> PITA to setup).
>
>
> The better option would be to disallow completely write
> caching on the client side (because this is probably where it's going
> wrong) however I don't know how.

Client's caching can't affect the metadata and the log in particular
operations on the server. Client may indeed loose some data, but
that's completely different issue.

Felix

> You can get it to flush extremely
> often by playing with  /proc/sys/vm/dirty_expire_centiseconds
> and /proc/sys/vm/dirty_writeback_centisecs, though. Safer settings
> generally imply terrible performance, though, you've been warned.
>
> Ah another thing may be some cache option in the iSCSI target. what
> target are you using?
>
> -- 
> --------------------------------------------------
> Emmanuel Florac               www.intellique.com
> --------------------------------------------------
>
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