Deleting initiator groups
You can use the Initiator Groups tab in System Manager to delete initiator groups.
All the LUNs mapped to the initiator group must be manually unmapped.
Click Storage > LUNs.
In the Initiator Groups tab, select one or more initiator groups that you want to delete, and then click Delete.
Verify that the initiator groups you deleted are no longer displayed in the Initiator Groups tab.