Ibrahima Bah abe@netapp.com writes:

I will just suggest you make sure that all clients mounting the filer running 4.0.1c are unmounted before you proceed to upgrade. Otherwise after the upgrade you will have stale NFS file errors on all your clients and you will need to reboot all clients to fix it. The 4.0.1c had NFS over TCP on by default.

Stale NFS file errors are different from the NFS over TCP problem. I could be wrong, but I don't remember stale filehandles being an issue except for certain broken *down*grades. Check the upgrade notes.

In addition to switching all clients to UDP, you can put this line into your rc file right before you reboot.

options nfs.tcp.enable on

You can still switch clients to UDP, but you won't have to wait until every last one has switched this way.

- Dan