[Lustre-discuss] Delete file entries from Metadata server

[Daire Byrne]

Mag,

----- "Mag Gam" <magawake at gmail.com> wrote:

> To do the ll_recover_lost_found_objs, can we have everything mounted
> up? Or is it recommended we unmount everything?

You only need to unmount the "damaged" OST and remount it with "-t ldiskfs".
 
> Also what to do when we see ????? for the file attributes. Most
> likely
> these files are gone, how can we remove them from the system all
> together?

You should still be able to delete them. This will delete the entry on the
MDS but the deletion of the missing object on the OST will just fail. You
should try recovering the lost+found objects first though.

Daire


> On Wed, Mar 11, 2009 at 11:59 PM, Andreas Dilger <adilger at sun.com>
> wrote:
> > On Mar 11, 2009  19:33 +0100, Reto Gantenbein wrote:
> >> We recently had a hardware defect on one of our storage arrays
> which
> >> broke the file system on this device. After running e2fsck on the
> file
> >> system, I was able to mount the device again as lustre file
> system.
> >> However, a lot of data was written into the lost+found. Now we have
> a
> >> problem, that the MDS however didn't recognize that these files
> are
> >> not available anymore and so still lists them. But then they are
> not
> >> accessible which results in a I/O-Error.
> >
> > If the objects are in lost+found on the OST then I'd suggest first
> > to use the "ll_recover_lost_found_objs" on the filesystem
> (unmounted
> > from Lustre, mounted locally as "-t ldiskfs").  This will recover a
> > majority of your objects (=file data).
> >
> > Cheers, Andreas
> > --
> > Andreas Dilger
> > Sr. Staff Engineer, Lustre Group
> > Sun Microsystems of Canada, Inc.
> >
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> >
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