Patent ID: 8327184

Claim:
A storage control system being coupled to at least one host computer, the storage control system comprising: a plurality of disk drives include a first plurality of disk drives configuring a first RAID group, a second plurality of disk drives configuring a second RAID group and a plurality of spare disk drives; and a controller for sending and receiving data between said plurality of disk drives and said at least one host computer, wherein each of said plurality of disk drives stores unique information including a respective operational capacity and a respective operational performance which does not depends on the physical capacity and the physical performance thereof, so that said controller can manage a plurality of disk drives having different physical capacity and physical performance as same-type disk drives, wherein when a first disk drive included in said first plurality of disk drives is failed, said controller is configured to: compare the operational capacity and the operational performance of the failed first disk drive with those of each of said plurality of spare disk drives; select one of the spare disk drives whose operational capacity and the operational performance is the same as that of the failed first disk drive; and recover the data stored in the failed first disk drive to the selected spare disk drive using data stored in said first plurality of disk drives other than the failed first disk drive.