Patent ID: 8166264

Claim:
A system, comprising: a storage subsystem comprising a storage controller and a plurality of logical units; a storage area network; a host computer connected to the storage area network; a management server connected to the storage subsystem, the storage area network and the host computer; wherein the storage subsystem creates a virtual World Wide Port Name (WWPN) for each of the plurality of logical units, and wherein a Logical Unit Number Identifier (LUN ID) is generated for each of the plurality of logical units based on the virtual WWPN, wherein the storage controller further comprises instructions for migrating a source logical unit with a virtual WWPN, the instructions executing a process comprising: migrating the virtual WWPN of the source logical unit to a new storage controller; creating a target logical unit; creating a LUN ID for the target logical unit based on the migrated virtual WWPN; copying the source logical unit to the target logical unit; and deleting the source logical unit, wherein the LUN ID is generated by the storage controller through the use of a world wide name (WWN) of the source logical unit and additional information generated along with creation of the source logical unit wherein the additional information generated along with creation of the source logical unit is a timestamp.