On the NFS client, mount the file system by using the –ro option.
You can mount from the command line, through the automounter, or by adding an entry to the /etc/vfstab file that resembles the following:
bee,wasp:/export/share/local - /usr/local nfs - no ro
Note - Servers that are running different versions of the NFS protocol cannot be mixed in a command issued at the command line or in a vfstab entry. Mixing servers that support NFS Version 2, NFS Version 3, or NFS Version 4 protocols can be performed only with autofs. In autofs, the best subset of NFS Version 2, NFS Version 3, or NFS Version 4 servers is used.