| 摘要 |
PROBLEM TO BE SOLVED: To maintain the hit rate of specified prior data highly regardless of the rate of a cache memory capacity to the data capacity of a whole storage device. SOLUTION: In a disk sub-system 102 interposed between a central processing unit 101 and a disk drive 103, a priority queue area 108 whose capacity is made variable and set to an upper limit value 111 and a general queue area 109 are set in a queue management table 107 of a cache control part 106 which manages the cache memory 105, and the management of the priority data whose priority is high in the cache memory 105 is operated in a priority queue area 108, and the management of the other general data is operated in the general queue area 109 so that the residence time of the priority data in the cache memory 105 can be made longer than that of the general data. Thus, it is possible to maintain the hit rate of the priority data highly regardless of the rate of the storage capacity of a disk drive 103.
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