check if NFS mount is OK without hanging

thllgo · 02-24-2009, 10:54 AM

Hello,

Is there a way to check if an NFS mounted partition is OK and responding without hanging?

If you have an NFS mounted partition and the NFS server dies then everything I know how to check on an NFS mount is either old info or hangs. We have an application that copies files to an NFS mount and would like for it to be able to check to see if the mount is avail.

df hangs
stat -f hangs
grep /etc/mtab not accurate
grep /proc/mounts not accurate

The files mtab and mounts are not accurate because the NFS partition was mounted correctly but is no longer available because the NFS server died and those files will not have been updated.

Any help will be greatly appreciated
Thank you

rweaver · 02-24-2009, 01:54 PM

Quote:

Originally Posted by thllgo

Hello,

Is there a way to check if an NFS mounted partition is OK and responding without hanging?

If you have an NFS mounted partition and the NFS server dies then everything I know how to check on an NFS mount is either old info or hangs. We have an application that copies files to an NFS mount and would like for it to be able to check to see if the mount is avail.

df hangs
stat -f hangs
grep /etc/mtab not accurate
grep /proc/mounts not accurate

The files mtab and mounts are not accurate because the NFS partition was mounted correctly but is no longer available because the NFS server died and those files will not have been updated.

Any help will be greatly appreciated
Thank you

If /proc/mounts isn't accurate you have a more serious issue of some sort. That *should* be accurate. Have you tried typing just "mount"?

David1357 · 02-24-2009, 02:03 PM

Quote:

Originally Posted by thllgo

Is there a way to check if an NFS mounted partition is OK and responding without hanging?

You can run "df" or "stat" in the background and save the PID using "$!". Then you can use "sleep" and "wait" in a loop to wait until you are satisfied that the NFS mount is really not there.

thllgo · 02-24-2009, 03:37 PM

If /proc/mounts isn't accurate you have a more serious issue of some sort. That *should* be accurate. Have you tried typing just "mount"?

/proc/mounts isn't going to be updated because the client didn't umount the drive. The server died without informing anyone.
I have not tried just mount but I will.

You can run "df" or "stat" in the background and save the PID using "$!". Then you can use "sleep" and "wait" in a loop to wait until you are satisfied that the NFS mount is really not there.

I like this idea, I will try it.

Thank you

rweaver · 02-24-2009, 04:09 PM

Quote:

Originally Posted by thllgo

If /proc/mounts isn't accurate you have a more serious issue of some sort. That *should* be accurate. Have you tried typing just "mount"?

/proc/mounts isn't going to be updated because the client didn't umount the drive. The server died without informing anyone.
I have not tried just mount but I will.

You can run "df" or "stat" in the background and save the PID using "$!". Then you can use "sleep" and "wait" in a loop to wait until you are satisfied that the NFS mount is really not there.

I like this idea, I will try it.

Thank you

Might be just be able to test for the existence of a file on the nfs, it may hang for a short while but should time out at worst. I don't currently have an nfs mount in front of me to test this with.