| 摘要 |
Provided is storage subsystem including: a storage unit containing multiple disk groups; and a control device for controlling the storage unit. The storage unit includes at least one redundant disk group composed of at least a first disk group and a second disk group for redundancy. The control device is configured to: put the first disk group into a power-on state; put the second disk group into a power-off state; read/write data stored in the first disk group; turns on power of the second disk group at a predetermined timing; write, in the second disk group, data that has been written in the first disk group while the second disk group has been in the power-off state; and put one of the first and second disk group into the power-on state and the other one of the first and second disk group into the power-off state after the writing.
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