[root@activate /]# mount -t nfs -o nfsvers=2 mailbox:/Data/Music /mnt/server/music
mount: mailbox:/Data/Music failed, reason given by server: Permission denied
[root@activate /]# mount -t nfs -o nfsvers=4 mailbox:/Data/Music /mnt/server/music
'vers=4' is not supported.  Use '-t nfs4' instead.
[root@activate /]# mount -t nfs4 mailbox:/Data/Music /mnt/server/music
mount: block device mailbox:/Data/Music is write-protected, mounting read-only
mount: cannot mount block device mailbox:/Data/Music read-only