NetApp
Configuration > Protocols > iSCSI : Configuring iSCSI : Deleting a target portal group

Deleting a target portal group
You can delete one or more user-defined target portal groups. Deleting a target portal group removes the group from the storage system. Interfaces that belonged to the group are returned to their individual default target portal groups. You cannot delete system-defined portal groups.
Steps 
1.
From the Home tab, double-click the appropriate storage system.
2.
In the navigation pane, click Configuration > Protocols > iSCSI.
3.
Select the target portal group that you want to delete and click Delete.
4.
Select the confirmation check box and click Delete.