nfs timeouts

[Rick Orr]

We have @ 15 workstations (sun 3's, sun 4's, dec gpx's, dec 3200) that
use two sun 4/280's as nfs servers. Most of the workstions are used for
software developement so a lot of linking and compiling take place
over the nfs mounts. We keep receiving the following messages:

NFS server moon not responding, still trying
NFS server moon ok

I assume we are timing out, but I'am not sure.  Is there anyone that
can tell me how to go about fixing this problem. 

Thanks very much.
-- 
Rick Orr