[Lustre-discuss] problems after MDT migration

[Andreas Dilger]

On Oct 16, 2008  14:03 -0400, Christopher Walker wrote:
> We're migrating our MDT/MGS and have hit a snag.  I've tarred all files 
> on the MDT and moved them to the new MDT, untarred them, and set their 
> extended attributes.  When I try to mount the MDT, however, I get the 
> following:
> 
> [root at circemds1 ~]# mount -t lustre /dev/sdb1 /mnt/lustre/mdt/
> mount.lustre: mount /dev/sdb1 at /mnt/lustre/mdt failed: No such file or 
> directory
> Is the MGS specification correct?
> Is the filesystem name correct?
> If upgrading, is the copied client log valid? (see upgrade docs)
> 
> while /var/log/messages shows:
> Oct 16 13:48:41 circemds1 kernel: LustreError: 
> 20338:0:(mgs_fs.c:201:mgs_fs_setup()) __iopen__ directory has no inode? 
> rc = -2

It looks like you didn't unmount the local filesystem mount used for
restoring the backup before trying to restart Lustre.  If you rebooted
in the meantime (I assume yes, given the date) it should have started
working again.

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