| 摘要 |
PROBLEM TO BE SOLVED: To reduce the time required for restoring data redundancy even when a fallback occurs in the data redundancy in a RAID group. SOLUTION: The storage device is provided with: a virtual volume control unit 11 which allocates, upon detection of a write request for new data in a virtual volume to be accessed, an actual storage space of a physical medium 2 existing in the same storage group 2A to the virtual volume in accordance with volume capacity of the new data; a storage control unit 12 which stores the new data as actual data in the actual storage space of the physical medium 2 allocated to the virtual volume; and a restoration control unit 13 which causes, upon detection of a fallback in data redundancy in the storage group 2A, the actual data in a stored space among the actual storage spaces in the physical medium 2 that has caused the fallback to be preferentially restored in an actual storage space in a destination physical medium 2 with reference to the physical media 2 other than the physical medium 2 that has caused the fallback in a storage group 2A to which the physical medium 2 which has caused the fallback belongs. COPYRIGHT: (C)2011,JPO&INPIT |
