HP 3PAR Operating System Software - Manual (Page 149)

4. (Optional) Select the Select to also delete checkbox to remove volumes and descendents without
active VLUNs, volumes associated with active VLUNs, and volumes that are part of a volume
set.
When the volumes to be removed involve active VLUNs, selecting the checkbox displays the
Unexport Virtual Volume confirmation dialog.
If you cancel the Unexport Virtual Volume dialog, the checkbox on the Remove Virtual Volume
dialog is cleared. If you click OK on the Unexport Virtual Volume dialog, there is a second
warning message.
Removing Virtual Volumes 149