Patent ID: 7418622

Claim:
A storage control system comprising a storage device and a controller for controlling data transmission between the storage device and a host system, the storage device comprising a plurality of storage media together constituting a RAID group, and a spare medium to which storage information in a faulty storage medium is saved; wherein, the controller executes, based on a control program, the steps of: (a) detecting a failure in the storage media; (b) recovering storage information in the faulty storage medium based on storage information in the remaining storage media in the RAID group, and copying the storage information to the spare medium; (c) reporting the failure in the storage medium to a management terminal; (d) before all storage information in the faulty storage medium is copied to the spare medium, detecting the faulty storage medium's having been replaced with another storage medium; and (e) conditional on the detection in step (d), copying back the storage information in the spare medium to the replacement storage medium; wherein, upon detecting the replacement with the other storage medium in step (d), the controller immediately copies back the storage information in the spare medium to the other replacement storage medium even before the completion of the copying of all storage information in the faulty medium to the spare medium.