unmounting disconnected network filesystems [solved]

barrymac · Tux's lil' helper Joined: 15 Jul 2004 Posts: 87

Hi all,

Apologies if this has been answered before but this is something I've always been irritated by with linux. If I have an NFS mount or a samba mount and something happens like a network cable gets disconnected or a system gets rebooted then I can't remount the filesystem. The lock even persists so that the system concerned won't reboot, and unless the sysrq key is enabled I have to hit the power button.

Given what reports I've read about ext4 this is actually a major hurdle to overcome before I would consider ext4, having been badly burned by XFS many years ago due to something similar.

Does anyone know a way to force the broken network filesystem to dismount ? I get permission denied messages when I use lsof or fuser to try and see what process I could kill to release them.

Thanks in advance,
Barry.

alex.blackbit · Advocate Joined: 26 Jul 2005 Posts: 2397

you already tried "umount -l" and "umount -f", right?

barrymac · Tux's lil' helper Joined: 15 Jul 2004 Posts: 87

em, that would be a no!!

Just the lazy unmount did it!

I guess this was my day to humiliate myself by not even reading the umount man page :oops:

thank you Alex for the pointer and you're patience with this failing bundle of neurons!

Now to get the init scripts to try that when the system powers down .. I think this should be an option after a certain timeout value.

Barry.