| 摘要 |
PROBLEM TO BE SOLVED: To allocate a logical volume without fixing the role of a physical module by duplexing data within the logical volume. SOLUTION: An integrated administrative module 12 selects any one of modules 10-1 to 10-4 each having a storage device within a designated range as a slice data allocation target on the basis of requests from clients 18-1 to 18-5, allocates the primary logical volume to modules each having a non-allocated slice area one by one in round robin scheduling as required, and allocates a secondary logical volume to a module, as required, which is selected with a predetermined evaluation function on the restriction conditions that said module does not becomes the same as a volume having a primary logical volume in charge of the same data area. COPYRIGHT: (C)2005,JPO&NCIPI
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