| 摘要 |
PROBLEM TO BE SOLVED: To implement snapshot backup with no dependency with a positive volume in terms of performance and failure, and with high capacity efficiency. SOLUTION: A storage system is provided for storing data written from a computer. When a data write request to a first logical volume is received, the data on request is stored into the first logical volume. When a first-generation snapshot creation request is received, the data stored in the first logical volume at the time of receiving the first-generation snapshot creation request is written into a pool region as data corresponding to a first-generation snapshot. When a second-generation snapshot creation request is received, any portion of the data updated after the first-generation snapshot creation request is received but before the second-generation snapshot creation request is issued is read from the first logical volume for writing into the pool region. COPYRIGHT: (C)2010,JPO&INPIT
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