Patent ID: 8145602

Claim:
A method of restoring data of a logical volume of a plurality of logical volumes to which at least a portion of storage area of a plurality of storage devices are assigned, the method comprising: storing first identification information, second identification information, and an association between the first and second identification information in a logical volume management table, the first identification information indicating a first logical volume of the plurality of logical volumes used for a set of original data utilized by a host device, the second identification information indicating a second logical volume of the plurality of logical volumes used for storing a copy of the set of the original data of the first logical volume; accepting data specification information that specifies data of a restoration target; specifying the second identification information as indicating a save source of the data of the restoration target specified by the data specification information; acquiring the first identification information associated with the specified second identification information from the logical volume management table; specifying a restore destination volume as being the first logical volume based on the acquired first identification information; accessing a magnetic tape cartridge to which data stored by the second logical volume has been saved via a magnetic tape drive to read the data of the restoration target specified by the data specification information from the magnetic tape cartridge; and storing the data of the restoration target read from the magnetic tape cartridge to the restore destination volume.