| 摘要 |
PROBLEM TO BE SOLVED: To provide a storage system for coping with even a case where an access frequency increases suddenly. SOLUTION: A file server 200, holding tag information representative of file contents and an access frequency of each file, calculates a tag rating from the access frequency of each file and calculates a file rating from the tag rating affixed to the file. It controls to place a file having a high file rating on a higher transfer performance layer, and place a file having a low file rating on a lower transfer performance layer. Thereby, the file whose access is anticipated to be increased after interest is increased although an access frequency is still low is placed in advance, on a layer having short response time and high throughput, and the file whose access is anticipated to be increased because of increased interest although an access frequency is lowered is left as it is, on a layer having short response time and high throughput. COPYRIGHT: (C)2011,JPO&INPIT
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