No Sun Cluster node can be an NFS client of a Sun Cluster HA for NFS-exported file system being mastered on a node in the same cluster. Such cross-mounting of Sun Cluster HA for NFS is prohibited. Use the cluster file system to share files among cluster nodes.
Applications that run locally on the cluster must not lock files on a file system exported through NFS. Otherwise, local blocking (for example, flock(3UCB) or fcntl(2)) might interfere with the ability to restart the lock manager (lockd). During restart, a blocked local process might be granted a lock which might be intended to be reclaimed by a remote client. This would cause unpredictable behavior.