About initiator groups

An initiator group (igroup) specifies which initiators can have access to a LUN. When you map a LUN on a filer to the igroup, you grant all the initiators in that group access to that LUN. If a host is not a member of an igroup that is mapped to a LUN, that host does not have access to the LUN.

In the case of iSCSI clients, hosts are identified in an initiator group by their node names. In the case of FCP clients, hosts are identified in an initiator group by their World Wide Port Names (WWPNs).