Patent ID: 7383380
Filing Date: 2008-06-03
Classification: G06F

Abstract:
1. A storage system comprising: a plurality of disks including first disks configuring a RAID group and at least one second disk, wherein each of the first disks stores one of data received from a computer coupled to the storage system or parity data used for recovering the data received from the computer, and wherein the at least one second disk is to be used as a spare disk; and a control section configured to hold an error status of each of the first disks, and to start to mirror data between one of the first disks and the at least one second disk when the error status of the one of the first disks matches a predetermined first criterion, wherein, after starting to mirror data between the one of the first disks and the at least one second disk, the control section is configured to stop mirroring data between the one of the first disks and the at least one second disk, before completing mirroring data between the one of the first disks and the at least one second disk, and start to mirror data between another one of the first disks and the at least one second disk, according to the error status of the one of the first disks and the another one of the first disks.