Storage system, data relocation method thereof, and recording medium that records data relocation program

摘要: There is a need to improve access speed for file in storage system that provided with multiple units having different speeds. The ( 10 ) includes an frequency acquiring part 14 divides past constant accessed data acquisition period into unit periods, and obtains stored any of the 30 31 ), similarity degree calculating 16 obtains, each file, between period, every other grouping process 17 groups one or more files equal higher than predetermined value, identical group, relocation 18 places belonging group high speed, when there exists within which belongs.