HP 3PAR Operating System Software - Manual (Page 141)

4. (Optional) Select 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, clicking the checkbox will display
the Unexport Virtual Volume confirmation dialog.
If you cancel the Unexport Virtual Volume dialog, the checkbox on the Remove Virtual Volume
dialog will be unchecked. If you click OK on the Unexport Virtual Volume dialog, there will
be a second warning message.
Removing Virtual Volumes 141