Patent ID: 8392752

Claim:
A disk array provided with a Redundant Array of Inexpensive Disks (RAID) group in a RAID configuration with redundancy of two or more, the disk array comprising: a data recovery technique selecting unit to select a technique for recovering data from a first failed disk to be recovered first, the technique being selected from among a plurality of techniques based on the type of storage apparatus included in the RAID group, and I/O conditions with respect to the RAID group, when failures occur in two storage apparatus in the RAID group; a data recovering unit to split recovered data from the first failed storage apparatus and writing the recovered data to two recovery storage apparatus in accordance with the data recovery technique selected by the data recovery technique selecting unit; and a recovered data aggregating unit to take the recovered data from the first failed storage apparatus that has been split and written to the two recovery storage apparatus, and to aggregate the recovered data onto one of the two recovery storage apparatus.