Sun Cluster Data Service for NFS Guide for Solaris OS

Sun Cluster Data Service for NFS Guide for Solaris OS omits some restrictions that apply to the use of Sun Cluster HA for NFS with NFS v3.

If you are using Sun Cluster HA for NFS, do not use the cluster nodes as NFS v3 clients of external NFS servers. This restriction applies even when the external NFS server is a network-attached storage (NAS) device. If you configure your cluster nodes this way, locks that the cluster nodes might have set on the external NFS servers are lost.

This restriction does not apply to NFS v4 clients. You can use NFS v4 to mount external NFS servers.