| 摘要 |
Proposed are: a disk array apparatus that can effectively and efficiently utilize its storage resources, and a method for controlling such a disk array apparatus. A disk array apparatus and a method for controlling the disk array apparatus with a function of: retaining difference data that represent a difference between the content of a first logical volume at a designated time and the content of the current first logical volume, as well as difference management information that is management information for the difference data; and restoring the first logical volume to the state it was in at the designated time based on the retained difference data and difference management information. In the disk array apparatus and its control method, a second logical volume for storing the difference management information is set, in accordance with external operation, in a storage area provided by a specified storage device. When suspending the operation of the disk array apparatus, the difference management information retained in a specified memory is saved on the second logical volume; and when activating the disk array apparatus, the difference management information is read from the second logical volume and stored in the memory.
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