Sun Cluster does not require any specific disk layout or file system size. Consider the following points when you plan your global device and cluster file system layout.
Mirroring - You must mirror all global devices for the global device to be considered highly available.
Disks - When you mirror, lay out disks so that they are mirrored across disk arrays.
Availability - You must physically connect a global device to more than one node in the cluster for the global device to be considered highly available. A global device with multiple physical connections can tolerate a single-node failure. A global device with only one physical connection is supported, but the global device becomes inaccessible from other nodes if the node with the connection is down.