| 摘要 |
A storage controller of the present invention makes use of the differences in power rates by time zone and geographic region to control the data storage destination between storage devices of different power consumption. The storage controllers of respective sites each comprise a hard disk and flash memory device, which consume different amounts of power. A schedule manager manages a schedule for controlling the data storage destination utilized by the host. At night, when the power rate is low, data is copied from a hard disk to a flash memory device. In the daytime, when the power rate is high, an access from the host is processed using the data inside the flash memory device. Copying data between remote sites makes it possible to reduce the power costs of the storage system as a whole.
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