Patent ID: 6892268

Claim:
A storage system comprising: a first disk controller coupled to a host computer, a processor, and another storage system, said another storage system comprising a second disk controller and at least one second disk coupled to said second disk controller; and at least one first disk coupled to said first disk controller, wherein said first disk controller includes a memory in which correlation information among first disk identification information, identification information designating said another storage system, and second disk identification in stored, said correlation information being set in said first disk controller by said processor coupled to said first disk controller; and wherein said first disk controller is configured to receive a write reguest from said host computer, select a storage system including a target disk corresponding to first disk identification information included in the write request by using said correlation information, obtain, if a selected storage system is said another storage system, identification information designating said another storage system and second disk identification information designating one of said at least one second disk based on said first disk identification information and said correlation information, and send a write request to said another storage system according to said identification information designating said another storage system and said second disk identification information.