[Lustre-discuss] Emptied OSTs not empty

Wojciech Turek wjt27 at cam.ac.uk
Mon Jun 27 07:39:24 PDT 2011

I would check if the file list generated by find contains those remaining
(after migration) files. If yes, then there is a chance that those files
were changed during migration and checksum didn't match thus they were not
migrated. Also there is a chance that the migration script has a problem
with parsing names of some files thus fails to transfer them. I guess you
could do some debugging of the migration process and narrow down the

Best regards


On 27 June 2011 14:37, Bob Ball <ball at umich.edu> wrote:

> I had the same issue with Lustre 1.8.4.  Wash, rinse, repeat....  In
> other words, do the lfs_find, do the lfs_migrate, then do the find a
> second time.   That seemed to catch most everything of importance.   I
> haven't a clue why this should be the case, but it was true on every OST
> that I migrated last fall.
> bob
> On 6/27/2011 6:50 AM, Thomas Roth wrote:
> > Hi all,
> >
> > I am currently moving off files of a number of OSTs - some in a machine
> with a predicted hardware
> > failure, some for decommissioning old hardware etc. I'm deactivating the
> OSTs on the MDS, then "lfs
> > find  --obd OSTXXXX_UUID /dir" to create a list of file to migrate.
> > When finished, the OST partitions are still up to 14% full! Mounting as
> ldiskfs, I can inspect the
> > data in O/0/d??, which all seem to be valid files, text files readable,
> ownership and atimes
> > meaningfull etc.
> > Since these OSTs have been deactivated on the clients also, nobody has
> complained about missing files
> > - although this could just mean that our users keep Terabytes of old junk
> they don't access any more.
> > So I wonder where these files belong to or why they are not missing.
> There were no severe crashes of
> > the system in the recent past which could have caused major memory loss
> of the MDT.
> > Something to worry about? Global lfs_check necessary?
> >
> > Perhaps I will do some "du" runs. Users want this info anyhow, and if I
> just missed the files in the
> > "lfs find" run, they should show up as errors here.
> >
> > Regards,
> > Thomas
> >
> >
> >
> >
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