NFS stale error

[prajul.keeriyat]

Hi,
When i unmount the nfs file system,it gives divice busy error,after that it is in nfs stale states.please help

[Elmar P. Kolkman]

Apperently some process is still using the mounted filesystem. You might be lucky and have lsof available... That might be able to tell you which process is the culprit. But only if it is killable then.

Best bet is to have the NFS server back, unmount and then bring down the NFS server/export again.

If that is not a possibility, the only option left is to do it the MS way: reboot...

[Dave Olker]

What OS is the NFS client running? As of 11.23 (and 11.31) we support the forced umount command: "umount -f " where the client can unmount a filesystem even if the server is down or the server has un-shared the filesystem.

If you're running 11.23 or higher on the client give that a try before rebooting.

Dave

[Pramod M]

Hi,
Try
fuser -cuk /filesystemname
umount /filesystemname

[Vijaykumar_1]

This issue would also exist if the filesystem is full, i would suggest that you login to the NFS server and have a check on the FS.

[singh sanjeev]

refer this doc :

google :

forcibly umounting nfs filesystem

http://g4u0420c.houston.hp.com/en/3929/ForciblyUnmountingNFSFilesystems.pdf

[Kapil Jha]

nfs stale....
check if any process is running, try to kill it
lsof and fuser may be good option.

if its still stale you can try to clear nfs locks
clear_locks server_name

make sure you do not have any other nfs from same server.
clear_locks should be used with care, else could result in curruption.

BR,
Kapil+

[Kapil Jha]

read man page for more information
man clear_locks.

BR,
Kapil+

[prajul.keeriyat]

thanks