If you delete a volume that is mapped to a host or host group or that has snapshots associated with it, you also delete the mappings. If the selected volume is the only volume in the virtual disk, the virtual disk is also deleted. If there are other volumes in the virtual disk, the storage space used by the deleted volume is converted to a free extent for future volume creation.
To delete a volume:
The Array Summary page is displayed.
The Volume Summary page for that array is displayed.
This enables the Delete button.