You can use the Edit Initiator Group dialog box to add initiators to an initiator group. An initiator gets access to a LUN when the initiator group, that it belongs to, is mapped to the LUN.
Steps
1.
From the Home tab, double-click the appropriate storage system.
2.
In the navigation pane, click Storage > LUNs.
3.
In the Initiator Groups tab, select the initiator group and click Edit.