NFS mount points lost silently
 

Got a weird one here.

Did some Datacentre maintenance on saturday, where we moved some servers around and brought them back up. All my app servers mounted their filesystems over NFS fine.

This morning, however logged in and one 1 app server, the filesystems are gone, unmounted.

df -h only outputs the local partitions, nothing else. I re-mounted the filesystems manually, using mount.

So far, everything is functioning fine. So i start to go through /var/log/messages on both client and server and i cant find a thing past when the machine booted up on saturday and mounted the filesystems.

Normally i would expect to see something in the logs. Am i looking in the wrong place perhaps? Or any other light shed would be appreciated, so i can make sure it doesnt happen again.

If you've just been moving stuff around, maybe someone was still moving cables and the mount timed out?