Solaris 10 and above and Red Hat Enterprise Linux (RHEL) 5 and above have support for NFSv4. Unfortunately, how each OS handles the newest version is different, and the way it is mounted is drastically different.
How each OS handles NFSv3 and NFSv4
All Linux distros treat NFSv4 as a different filesystem. Solaris treats NFSv4 as a newer version, which is the sane, and sensible way of handling it IMO; thanks Linux…. To mount an NFSv4 filesystem in RHEL 5, you mount it the following way:
mount -t nfs4 <server>:<share> <mountpoint>
For NFSv3, you mount it the following way: