You can use the Initiator Groups tab to delete an initiator group. If you attempt to delete an initiator group that is mapped to a LUN, an error message informs you that all the mapped LUNs must be unmapped before you can delete the selected initiator group.
Steps
1.
From the Home tab, double-click the appropriate storage system to display a subtree of management features.
2.
Click Storage > LUNs.
3.
If the appropriate tab is not displayed, click the Initiator Groups tab.
4.
Select one or more initiator groups and click Delete.