If you have encountered issues like
mount.nfs: requested NFS version or transport protocol is not supported
OR
mount.nfs4: Protocol not supported
Mount with NFS version 3 (with 4 verbose flags)
% mount -vvvv -t nfs -o vers=3 nfs-server:/share /mnt/nfs
1. Assuming this is your mount command
mount -t nfs -o vers=3 XXX.XXX.XXX.XXX:/myserver/nfs /myclient/nfs
2. And if you are using showmount command from an NFS client and the following are observed
clnt_create: RPC: Program not registered
3. You have to access the NetApp Storage to check the NFS Protocol is enabled. I’m using the Netapp OnCommand System Manager
4. Check that the NFS Client can mount.
showmount --no-headers -e nfs_server / (everyone)
References:
The Linux Cluster 