Patent ID: 8049365

Claim:
A power device configured to supply power to a plurality of storage devices comprising a first direct-current power input port and a second direct-current power input port, comprising: a plurality of first direct-current power units configured to supply direct-current power to the first direct-current power input ports of the respective storage devices; a plurality of second direct-current power units configured to supply, to the second direct-current power input ports of the respective storage devices, the same direct-current power as the direct-current power supplied from the first direct-current power units to the first direct-currently power input ports of the respective storage devices; and a power controller configured to control respectively the first direct-current power units and the second direct-current power units, wherein the storage devices are grouped into a plurality of subgroups each comprising a plurality of the storage devices, the first direct-current power units and the second direct-current power units are respectively provided in the same numbers as the numbers of the subgroups, the first direct-current power units are respectively configured correspondent to one subgroup of the subgroups, and to respectively supply the direct-current power to the first direct-current power input ports of the storage devices inside a corresponding one of the subgroups, and the second direct-current power units are respectively configured correspondent to all of the subgroups, and to respectively supply, with respect to each of the subgroups, the direct-current power to the second direct-current power input port of one storage device of the storage devices inside the subgroups, wherein the storage devices configured to supply direct-current power by the first direct-current power units and the second direct-current power units belong to different RAID groups from each other.