The procedure to delete the volume forcibly is as follows:
On the global navigation tab, click [Storage].
The registered ETERNUS Disk storage systems are displayed on the Main pane.
On the Main pane, click the target ETERNUS Disk storage system.
On the Category pane, click [Volume].
The volume list is displayed on the Main pane.
On the Main pane, check the target volume checkbox.
On the Action pane, click [Force Delete] under [Volume].
The information confirmation screen is displayed.
Confirm the information, and click the [Force Delete] button at the lower right.