[Lustre-discuss] MDT backup procedure

[Andreas Dilger]

On Jun 17, 2009  09:41 -0600, Daniel Kulinski wrote:
> As we move forward with our lustre testing I am wondering about MDT backup.
> 
> Is it feasible to unmount the MDT, create an image of it and remount it
> after the backup.  Of course this wouldn't happen but nightly.
> 
> >From what I can identify, in the case of an MDT failure we would have to do
> the following:
> 
> Restore from the last backup.
> 
> Run an lfsck across the filesystem.
> 
> Am I missing anything else at this point?  We will also be doing file level
> backups of the filesystem as a whole but we are looking for quick ways to
> recover from an MDT failure.

There is a documented process for doing MDT backup/restore that should be
used.  In particular there are some files which shold not be restored if
the MDT is being restored.

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