| 摘要 |
A RAID control unit forms a redundant configuration of RAID with respect to a physical device including a plurality of disk devices. A cache control unit processes data in page units corresponding to a stripe of the disk devices. A cache area placement unit, when it receives a write request from an upper-level device, places, in a cache memory, a cache area which is provided with a plurality of page areas and has the same size as the stripe area. When new data in the cache memory which is newer than the data in the physical device is to be written back to the storage device, a write-back processing unit generates new parity data by use of an unused area in the cache stripe area, and then writes the new data and the new parity to the corresponding storage devices.
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