Patent ID: 7565573

Claim:
A data-duplication control apparatus that controls a duplication process for duplicating data stored in a storage device that constitutes redundant-array-of-independent-disks, the data-duplication control apparatus comprising: an information storing unit that stores information on a level of the redundant-array-of-independent-disks of the storage device; a failure-sign detecting unit that detects a sign of a failure with respect to the storage device; a duplication-source-device selecting unit that selects a storage device of a duplication source based on the information stored; and a data reading unit that reads data stored in a storage device, wherein when the storage device belongs to a level of the redundant-array-of-independent-disks in which same data is stored in a plurality of storage devices, and when an access regarding to readout of data stored in the storage device has been issued, the duplication-source-device selecting unit selects the storage device from which the sign of a failure has been detected as the duplication source from among the storage devices that store the same data, and the data reading unit reads the data from a storage device from which no sign of a failure has been detected.