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How to unmount NFS share mounted with hard option

Started by Scoundrel · 9 months ago

Few days ago I worked on some customer’s server and there was a problem - their nfs server went down and we were forced to change some settings on their FC4 clients to prevent shares from dieing because of kernel bug. But when we’ve changed settings in /etc/fstab there wa ... Continue reading »

5 comments

Mikael
1 year ago

cool doc

reply

Andre-Sebastian
1 year ago

I recommend using 'lsof' to check which processes is using the nfs share before killing one.

i.e. if one has a nfs share mounted on /netfs the syntax would be:
lsof +f -- /netfs
(for more examples consult the lsof man pages)

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LAMEtHIng
1 year ago

Finally the answer! Thanks a lot man I was looking everywhere for this! The key for me was the 'D' state. I had an vsftpd process AND lsof process holding up the NFS umount. What happened was that I lost connection to my NFS server and then my IP changed. I couldn't even run fuser OR lsof as it would just freeze and never timeout. I tried restarting all the rpc.nfs stuff and the ftp server to no avail. Finally this works, thanks a ton man!

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Yordan
1 year ago

man: umount
---------------
-f Force unmount (in case of an unreachable NFS system). (Requires kernel 2.1.116 or later.)

-l Lazy unmount. Detach the filesystem from the filesystem hierarchy now, and cleanup all references to the filesystem as
soon as it is not busy anymore. (Requires kernel 2.4.11 or later.)
------------------

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ray
10 months ago

umount -f does not work when NFS mount is stuffed due to the NFS server rebooting or something like that. The only thing which worked for me was what was posted here by Scoundrel. Thanks a million it helped me finally sorting this out without rebooting all involved servers. Triple kudos.

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