[Lustre-discuss] files in lost+found

[Andreas Dilger]

On Apr 04, 2009  18:58 -0400, Mag Gam wrote:
> I see, so there is no easy way to recover on the MGS. I have a good
> idea who the user is for these files but the file names are very hard
> to decypher. They have names like 543434. I am not sure what file that
> would be part of...

The problem at this point is that the directories were corrupted
(unfortunately due to bug 18695 I think) and the names of the files
are lost.  The best that e2fsck can do at this point is to put the
files into lost+found with the inode number as the filename.

> On Sat, Apr 4, 2009 at 5:57 PM, Andreas Dilger <adilger at sun.com> wrote:
> > On Apr 04, 2009  09:36 -0400, Mag Gam wrote:
> >> I have over 52k files in my lost+found of my MGS (not my OSTs). I am
> >> not sure what tool I need to use to recover these files. Should i use
> >> lfsck or ll_recover_lost_found_objs?
> >
> > That is only for the OSTs.  Unfortunately, there is no easy way to
> > recover them except by e.g. UID/GID and looking at the contents,
> > which is true of local filesystems as well.
> >
> > I'd recommend making a lost+found directory in each user's home dir
> > and then moving all of their files into their directory (with MDS
> > mounted with -t ldiskfs) and let them sort it out.
> >
> > In Lustre 2.0 and later the MDS inodes will contain an attribute that
> > holds the filename and parent directory ID that will allow recovery in
> > a manner similar to how ll_recover_lost_found_objs does for the OST.

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