Patent ID: 8108702

Claim:
A disk array device, comprising: means for operating a plurality of controller modules and disks; means for determining a future operating state, based on operation history of the plurality of controller modules and the disks; setting means for setting an operating state of the plurality of controller modules and disks in such a way as to reduce its power consumption, based on the future operating state of the plurality of controller modules and disks, wherein each of the plurality of controller modules comprises a plurality of CPUs, the means for determining the a future operating state determines a future operating state, based on operation history of the plurality of CPUs, the setting means sets an operating state of a CPU in such a way as to reduce its power consumption, based on the future operating state of the plurality of CPUs, the setting means comprises means for distributing load of a specific controller module to another controller module while securing redundancy of the CPU; and means for lowering an operating frequency of the plurality of CPUs instead of distributing load when load of another of the plurality of CPUs becomes too high.