Hi all,

I mounted a directory with NFS bt executing the following command:

mount computer_host:/home/jon /home/tmp

It goes ok and I can use it as I wish on any of my machines it is mounted on (lan).
How do I unmount it? If I type:

umount computer_host:/home/jon /home

I get a message saying it isn't even mounted???
Any ideas?

Jon

Have you tried:

# umount /home

I find if I attempt to unmount the directory it's mounted to(or mount point if you'd rather be specific) that it works just as well. Another option is:

# more /etc/mtab

which shows ALL currently mounted filesystems, then you can umount whichever the NFS is attached too. One thing to note is that you cannot be in a directory on the NFS system(or you'll get an in use error).

J

You probably want to specify some options when you mount your NFS shares. If you are on a unswitched LAN (so Coax or a hub) try the following:

mount -t nfs -o async,rsize=4096,wsize=4096 server:/share /someDir

This forces all IO to be done asynchronosly (sp?) and your read size and write size to be a bit friendlier for Intel boxes (if you're on a SPARC or something then this is different - IIRC its something to do with the CPUs page size - but don't quote me on it).

If you on a switched LAN then you might want to leave our the 'async' option.

As for the umount I've just always used umount /someDir without any problems.

HTH

Jamie...

I still cannot seem to unmount the nfs directory. If I try:

umount server:/directroy

I get a DEVICE IS BUSY reply.
Any ideas?

Jon

jonfa,

did you get it to umount in the end?

I am having the same problem, and so do a lot of people . Noone seems to have an answer.

thanks
hamish

Ok, i just found the trick!!! (pity it SUCKS so bad)

remove the line in /etc/exports which contains the offnding drive, save and exit. Run exportfs -ra and then umount. perfect.

Pity it is so fidly. There MUST MUST MUST be a better way.

thanks
Hamish

If you mounted nfs directory to /mnt/<nfs_drive>

umount /mnt/<nfs_drive>

My cd drive in my Server is /mnt/export/cdrom.

Even if I 'umount /mnt/export/cdrom', I still get told that it is busy....strange...

why would unmounting the directory be any different from unmounting the device itself?

hamish

>>even if outdated, google finds this post<<

I had the same problem and an appropriate solution:
use the -l (Lazy ->man) option

umount -l /path/to/share

works like a charm, without editing /etc/exports ;-)

Here is a fix for unmount http://sysdigg.blogspot.com/2007/12/...-in-linux.html