[Lustre-discuss] How to umount Lustre on a client?

[Andreas Dilger]

On Dec 23, 2008  23:19 +0800, Lu Wang wrote:
>    Our Lustre clients are frozen for some reasons sometimes. To avoid restart these client nodes, I tried to umount and remount lustre. At first, I used "umuont -f ", it said "device is busy", so I tried "umount -l " and then "mount  ....", the commands were successful and users could see Lustre again, however, there were two sets of Lustre clients 

"umount -l" does not really unmount a filesystem.  If you are getting
"device is busy" errors with "umount -f" that means your applications
are still using the filesystem, and need to be killed before umount.

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