Remove the disk device that you are replacing as a quorum device.
If the device you intend to remove is the last quorum device, you might want to first add another disk as a new quorum device. This will ensure that there will be a valid quorum device in case there is a failure during the replacement procedure. See Adding a Quorum Device to add a new quorum device.
See How to Remove a Quorum Device to remove a disk device as a quorum device .
Replace the disk device.
To replace the disk device, see the hardware procedures for the disk enclosure in the Sun Cluster 3.0-3.1 Hardware Administration Manual for Solaris OS.
Add the replaced disk as a new quorum device.
See Adding a Quorum Device to add a disk as a new quorum device.