NFSV3 Restrictions

If you are mounting file systems on the cluster nodes from external NFS servers, such as NAS filers, and you are using the NFSv3 protocol, you cannot run NFS client mounts and the Sun Cluster HA for NFS data service on the same cluster node. If you do, certain Sun Cluster HA for NFS data-service activities might cause the NFS daemons to stop and restart, interrupting NFS services. However, you can safely run the Sun Cluster HA for NFS data service if you use the NFSv4 protocol to mount external NFS file systems on the cluster nodes.