Patent ID: 8806657

Claim:
A storage system comprising: a host computer; a management computer coupled to the host computer; a first storage device coupled to the host computer and the management computer, and including first port management information; and a second storage device coupled to the host computer, the management computer and the first storage device, and including second port management information; wherein the first port management information and the second port management information include an identifier of a port on each storage device, an identifier of a volume in each storage device, an access restriction and an identifier of a port permitted access from the host computer to each storage device, and wherein the management computer is configured to: transfer a volume from the first storage device to the second storage device; set the second port management information so that the access restriction and the identifier of the port corresponding to the identifier of the transferred volume are changed to permit the second storage device to be accessed by the port which is permitted access from the host computer to the first storage device; and set the first port management information so that the access restriction and the identifier of the port corresponding to the identifier of the transferred volume are changed to be canceled.