| 摘要 |
A storage controller of the present invention makes use of changes in power rates according to time periods, and controls the data storage destination between storage devices having different power consumption, such as a hard disk drive and a flash memory device. The storage controller comprises a hard disk drive and a flash memory device for which power consumption differs. A schedule manager manages a schedule for controlling the storage destination of data used by a host. Data is copied from the hard disk drive to the flash memory device at night, when the power rate is low. An access from a host is processed using data inside the flash memory device during the daytime when the power rate is high. The next night, the difference is copied so that the data of the flash memory device coincides with the data of the hard disk drive.
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