| 摘要 |
PROBLEM TO BE SOLVED: To provide a storage system and release method capable of avoiding user's unnecessary cost and operation, and efficiently utilizing a capacity not to be required for use of a secondary virtual volume. SOLUTION: The storage system includes: page area association information for associating a page area that partitions a storage area in a real volume into predetermined storage areas with a page area that partitions a storage area in a virtual volume into predetermined storage areas; a pair setting unit for pairing a primary virtual volume storing data from a host computer and a secondary virtual volume to store a copy of the data stored in the primary virtual volume; and a page release unit for releasing association between a page area in the secondary virtual volume and a page area in the secondary real volume pre-associated with the page area in the secondary virtual volume. COPYRIGHT: (C)2009,JPO&INPIT
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