IBM Midrange System DS4000 Series Hardware Manual page 234

From the Subsystem Management window, select Mappings  Manage Host Port
Identifiers. This option opens a window similar to Figure 4-83.
Figure 4-83 Manage Host Port Identifiers
Select this option if you need to review your port configuration assignment, add, remove, and
change port settings, and whenever you need to replace a host interface card after a
hardware replacement to continue presenting the logical volumes to the new host port
identifier, WWPN, or iSCSI Initiator.
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IBM Midrange System Storage Hardware Guide