HP StorageWorks XP Direct Backup Engine Software - Manual (Page 38)

38 HP Surestore Direct Backup Engine XP: User’s Guide
If you want the subsystem to check I/Os for the selected port(s), clear
the Not execute I/O check checkbox, and then select the Yes button.
If you want to delete the selected port(s) forcibly without I/O check,
select the Not execute I/O check checkbox, and then select the Yes
button.
The selected ports are deleted from the selected port group.