Patent ID: 6785792
Filing Date: 2004-08-31
Classification: G06F

Abstract:
A storage system comprising:a plurality of logical disks constituted by combining a plurality of physical disks; logical disk management means for converting input/output (I/O) requests addressed to said logical disks into I/O requests addressed to corresponding physical disks, and outputting the converted I/O requests; physical disk management means for accessing said corresponding physical disks in accordance with the I/O requests which are output from said logical disk management means and addressed to said physical disks; and logical disk relocation control means for relocating said logical disks so as to set busy rates of said physical disks within a range between a first state in which a ratio of the busy rates of said physical disks is equal to a ratio of I/O processing performance values of said physical disks, and a second state in which the busy rates of said physical disks are leveled.