The following change was introduced in the Sun Cluster 3.0 5/02 update release and applies to this update and all subsequent updates to Sun Cluster 3.0 software.
VxFS mount requirement - Globally mount and unmount a VxFS file system from the primary node (the node that masters the disk on which the VxFS file system resides) to ensure that the operation succeeds. A VxFS file system mount or unmount operation that is performed from a secondary node might fail.