STORAGE SYSTEM AND DATA RELOCATION CONTROL DEVICE

PROBLEM TO BE SOLVED: To achieve data relocation in accordance with a user's policies in an environment where a plurality of storage devices are combined. SOLUTION: 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 the volumes 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 to be moved V1 and V2 in group units, and indicates a storage layer forming a movement destination, thereby the data is relocated. COPYRIGHT: (C)2011,JPO&INPIT