Importance

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Abstract

In a storage system, a plurality of logical disks are constituted by combining a plurality of physical disks. A logical disk management unit converts input/output (I/O) requests addressed to the logical disks into I/O requests addressed to corresponding physical disks, and outputs the converted I/O requests. A physical disk management unit accesses the corresponding physical disks in accordance with the I/O requests which are output from the logical disk management unit and addressed to the physical disks. A logical disk relocation control unit relocates the logical disks so as to set the busy rates of the physical disks within a range between the first state in which the ratio of the busy rates of the physical disks is equal to the ratio of the I/O processing performance values of the physical disks, and the second state in which the busy rates of the physical disks are leveled. A data relocation method is also disclosed.

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First Claim