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