[Lustre-discuss] files in lost+found

[Andreas Dilger]

On Apr 04, 2009  22:47 -0400, Mag Gam wrote:
> I already did a e2fsck. The problem is on my clients I see couple of
> files with "????" in its attributes. I can't even remove these files
> to regenerate them.
> 
> Any idea on how to forcefully remove these files?

Probably "chattr -i" to remove the immutable attribute, and use the
"unlink" command to delete the files instead of "rm".

> On Sat, Apr 4, 2009 at 10:30 PM, Andreas Dilger <adilger at sun.com> wrote:
> > 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.
> >
> >

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