mount_nfs -3 -T -R 3 cluster02:/001 /m/001

(from df)
cluster02:/001  20481580 5979468 14502112    29%    /m/001
[root@backup02]:/m-->
# ls -l 
total 0
drwxrwxrwx  2 root  wheel  64 Nov 17 23:32 001
[root@backup02]:/m-->
# cd 001
-su: cd: 001: Permission denied

# umount 001/
umount: cluster02: RPCPROG_MNT: RPC: Program not registered