A disk array provided with a RAID group in a Redundant Array of Inexpensive Disks (RAID) configuration with redundancy of two, the disk array includes, 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 an aggregating unit to aggregate the recovered data onto one of the two recovery storage apparatus.