HP LUN Configuration Manager XP Software - Manual (Page 123)

VSC operations 123
The Customized Volume Size Define window now opens.
6. Select the volumes to be converted to space, and select Delete.
The Delete button is not available when either all of the LDEVs or the
last remaining LDEV in the parity group are selected or the LDEV
selected has a plus sign (+) next to it. If the selected volume has one or
more assigned SCSI paths, or the volume is either an LDEV security
volume or a LUSE volume, it is not available for VSC operations.