Patent ID: 8402231
Filing Date: 2013-03-19
Classification: G06F

Abstract:
1. A storage device comprising: a plurality of physical media including actual storage spaces in each of which data is stored; a group control unit which creates a plurality of storage groups using the plurality of physical media; a virtual volume control unit 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 existing in the storage groups to the virtual volume in accordance with volume capacity of the new data; a storage control unit which causes the new data to be stored as actual data in the actual storage space of the physical medium allocated to the virtual volume by the virtual volume control unit and secures redundancy of the actual data with respect to the physical medium in the storage groups; and a restoration control unit which performs, upon detection of a fallback of redundancy with respect to the physical medium in the storage groups, a restoration process using the physical media other than the physical medium that caused the fallback in the storage groups to which the physical medium that caused the fallback belongs, such that the actual data in a stored space is preferentially restored in the actual storage space in the destination physical medium among the actual storage spaces in the physical medium that caused the fallback.