[Raion]

IRIX NFS has a bug where if it is interrupted or if there's network congestion it can hang indefinitely until the connection resumes OR require both the host and client to reboot. This was never patched.

Others will disagree, but I've never had any luck using GNU/Linux as an NFS host, there are bugs in the Linux RPCBIND implementation and other problems that I observed. I usually recommend a BSD or illumos or Solaris. It also doesn't like mixed NFSv4 and v3 IME. Basically, you have to run pure v3 across your network, make sure you're using a good OS that doesn't get saturated. And your connection has to be reliable