The Sun Cluster sees Sun StorEdge A3x00 or Sun StorEdge A1000 disks as logical units (LUNs) and not as physical disks. Because of this:
As long as the LUN is available, no action is necessary when replacing a failed physical disk.
If the LUN is not available (or not in an optimal state) and was used as a quorum device, you need to use the scconf -q command to change the quorum device to a different LUN (disk) before proceeding with the disk replacement procedure.
For additional information regarding logical units and physical disks, refer to your expansion unit documentation.