[Lustre-discuss] MDT backup

[Andreas Dilger]

On Jan 20, 2009  09:43 -0500, Brian J. Murrell wrote:
> > Is there way to avoid corruption or it just fixed by fsck ?
> 
> Of course, if an MDS just up and dies, the MDT, whether it be on the
> local disk or a DRBD replicated copy should be fsck'd to follow best
> practises.  That's got nothing to do with DRBD though, but just simply
> cleaning up a filesystem left in an "open" state before using it again.

To clarify - you do not need to run e2fsck just on a crash.  The times
that e2fsck are required is when the backing storage is running with
write cache enabled and the write cache was not safely written to disk,
or in the case of a double failure (e.g. RAID disk failure + server
failure).

Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.