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# Understanding port groups

Port groups contain director and port identification and belong to a masking view. Ports can be added to and removed from the port group. Port groups that are no longer associated with a masking view can be deleted.

Note the following recommendations:

Port groups should contain four or more ports.

Each port in a port group should be on a different director.

A port can belong to more than one port group. However, you cannot mix different types of ports (physical FC ports, virtual ports, and iSCSI virtual ports) within a single port group.