[Lustre-discuss] Correct way to unmount a lustre client?

Andreas Dilger adilger at sun.com
Tue Jul 8 13:21:02 PDT 2008


On Jul 08, 2008  18:30 +0200, Hans-Juergen Schnitzer wrote:
> what is the correct way to unmount a lustre client
> when a simple "umount <filesystem>" responds with
> "device is busy"? A "umount -l <filesystem>" does
> unmount the filesystem however when I reboot the
> machine subsequently the shutdown process hangs.

The "umount -l" only removes the filesystem from the namespace, making
it unreachable.  It doesn't really "unmount" the filesystem at all.
It is likely that your "filesystem busy" is caused by processes using
Lustre for CWD or having files open there.  Use "lsof | grep /mount/point"
to see what processes are using the filesystem.


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




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