Patent ID: 6721841
Filing Date: 2004-04-13
Classification: G06F

Abstract:
A system for storing data comprising:a first storage system coupled to a host computer, said first storage system comprising a first disk controller, and at least one first disk coupled to said first disk controller; and a second storage system coupled to said first storage system, said second storage system comprising a second disk controller, and at least one second disk coupled to said second disk controller; wherein said first disk controller receives a write request issued from said host computer, determines if a disk designated by first disk identification information included in said write request is in said first storage system and, if the disk designated by said first disk identification information is not in said first storage system, obtains controller identification information designating said second disk controller and second disk identification information designating one of said at least one second disk based on said first disk identification information, and sends a write request to said second disk controller according to said controller identification information and said second disk identification information.