Sun Cluster does not require any specific disk layout or file system size. Consider the following points when planning your global device and cluster file system layout.
Mirroring - All global devices must be mirrored to be considered highly available.
Disks - When mirroring, lay out disks so that they are mirrored across disk expansion units.
Availability - A global device must have a physical connection to more than one node in the cluster to be considered highly available. This configuration can tolerate a single-node failure. A global device with only one physical connection is supported, but it is inaccessible from other nodes if the node with the connection is down.