Patent ID: 9141293
Filing Date: 2015-09-22
Classification: G06F

Abstract:
1. A storage device that copies copy source data stored in a copy source volume to a copy destination volume and manages copied data in units of generations, the storage device comprising: a first storing unit that stores information representing presence/no-presence of a copy in association with a logical address of the copy destination volume; a second storing unit that stores a physical address of the copy destination volume that corresponds to the logical address; and a processor that is programmed to determine, when receiving an access request for a predetermined logical address of a generation in a copy destination volume, presence/non-presence of a copy for the logical address of the generation for which the access is requested by using information which is stored in the first storing unit, and to access a physical address of the copy destination volume acquired from the second storing unit for the generation in a case where the presence of the copy is determined.