Patent ID: 7669066
Filing Date: 2010-02-23
Classification: G06F,Y02D

Abstract:
1. A disk array system comprising: at least one disk controller including: a cache memory unit for storing data exchanged between an information processor and each of a plurality of disk drives, a plurality of Hard Disk Drive (HDD) boxes each including at least one disk drive controlled by said at least one disk controller, wherein said at least one disk controller performs a destaging process such that data stored in said cache memory that has not been written in the at least one disk drive of the plurality of disk drives is written in the at least one disk drive, wherein said disk array system controls to stop supplying power to a disk drive, said disk drive having finished the destaging process, on a disk drive by disk drive basis, and wherein said disk array system controls to compare voltage of power supplied to each of a plurality of power units having been provided within the disk controller to a predetermined value and if the voltage is less than the predetermined value outputs a notice to the at least one disk controller.