Patent ID: 7996560

Claim:
An information processing system including: a first switch; a first storage system connected to the first switch and having a first logical unit; a second switch connected to the first switch and providing a second virtualized storage volume to a server; and a second storage system connected to the second switch and having a second logical unit which is associated to the second virtualized storage volume, the first switch and the second switch, each comprising: a plurality of physical ports for connection to a storage system and communication with a switch; a control processor; and a memory to store name management information including a port ID, a WWPN, a LUN, a LUN WWPN, mapping information, and a borrower lender field, wherein the mapping information relates the WWPN, the LUN, the LUN WWPN, and the borrower lender field, wherein the memory of the first switch further stores a first program including instructions that, when executed by the processor of the first switch, cause the processor to: set a first virtual port of a first virtualized storage volume when data stored in the second logical unit is migrated to the first logical unit by changing the name management table of the first switch; set a provisional port name to the first virtual port of the first virtualized storage volume by changing the name management table; associate the first virtualized storage volume with the first logical unit included in the first storage system; send a request to the second switch, which requests to borrow a port name of a second virtual port for the second virtualized storage volume in the second switch; receive from the second switch, in response to the request, a port ID of the second virtual port for the second virtualized storage volume; and set the borrower lender field to the port ID received from the second switch.