| 摘要 |
PROBLEM TO BE SOLVED: To prevent the free space in an upper storage device from becoming insufficient by shortening the time taken for migration processing. SOLUTION: A migration candidate retrieval processing part 1 is executed, at every given period, collects file information on every file in a disk device 4, sorts the collected file information according to the migration priority, produces a list of sorted file information, and outputs a migration candidate list 3. A migration processing part 2 is initiated asynchronously to the migration candidate retrieval processing part 1, inputs respective pieces of the file information from the migration candidate list 3 in the disposed order, and moves, regarding files that have not been referred to or updates after the collection of the file information, the corresponding file to a magnetic tape device 5 until a free space of a given capacity is secured in the disk device 4.
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