How to check NFS mount connectivity?

[yyghp]

I have NFS mount point connecting to the NFS server. I noticed that such NFS link is not stable enough for production usage, I would like to write a cron job to monitor the connectivity of such NFS mount point.
How to check it? What kind of command is good for this verification?
And if the NFS connection is broken, how to set the "Timeout", because it may hang the process. For example, if the NFS link is dead, and I use "bdf" or "ll" command, it will hang that session.
Thanks a lot!

[Ivan Ferreira]

If you link is unreliable, use udp instead of tcp for mounting nfs directories. You can use rpcinfo -p remotehost to check the status of the nfs services, you should see rpc.mountd and rpc.nfsd. If the link is dead, not sure if the command will ever timeout, I used to use df -t fstype to check the file systems that are not nfs. The ls command will hang, you should force the umount if possible.

[Sergejs Svitnevs]

I suggest you to use "soft" mount option in the fstab file. When a mount is a soft mount, an NFS request returns an error if it cannot be satisfied (for example, the server is down), then quits.

Regards

[Muthukumar_5]

You will get NFS related errors in system logs. You can write a script to monitor the system log with string nfs (care ignore) will help.

mount -p will show the statistics as well.

--
Muthu

[Vipulinux]

Hi

You can also increase the number of nfs sessions on the server to make it more reliable.

Cheers