Patent ID: 7420802
Filing Date: 2008-09-02
Classification: G06F,G11B

Abstract:
1. A disk array device connected to a higher-level device, comprising: a memory device mounting unit which mounts a plurality of memory devices; a logic mounting unit which is connected to said memory device mounting unit and receives a read request and/or write request from said high-level device to control data read and/or write from/to any one of said plurality of memory devices; and a battery mounting unit which mounts a battery, stores a part of electric power supplied to said logic mounting unit and said memory device mounting unit, and supplies said stored electric power to said logic mounting unit and said memory device mounting unit at the time of a power failure, wherein: said logic mounting unit mounts a cache memory which temporarily stores data transferred from said high-level device and performs control to write the data stored in said cache memory to said plurality of memory devices at the time of power failure, the power supply from said battery mounting unit to said plurality of memory devices is sequentially stopped in an order of memory device to which data writing from said cache memory has been completed, and even after the power supply to the hard disks in which the destage has been completed is stopped, the power supply into the cache memory from the battery is continued.