| 摘要 |
The present invention achieves data relocation in accordance with a user's policies, in an environment where a plurality of storage devices coexist. The volumes belonging to storage devices A-D are managed virtually integrally. A host recognizes a plurality of storage devices A-D as a single virtual storage device. The user is able to group arbitrarily each volume belonging to the storage system, as a plurality of storage layers 1 - 3 . For example, storage layer 1 can be defined as a high-reliability layer, storage layer 2 , as a low-cost layer, and storage layer 3 , as an archive layer. Each storage layer is constituted by a group of volumes corresponding to respective policies (high reliability, low cost, archiving). The user designates volumes V 1 and V 2 to be moved, in group units, and indicates a storage layer forming a movement destination, whereby the data is relocated.
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