Patent ID: 8185500
Filing Date: 2012-05-22
Classification: G06F

Abstract:
1. An information processing apparatus that performs data I/O processing on a P-VOL being a first logical volume, in response to a request from an external device comprising: a file system configured to receive data write and read requests in unit of files from the external device; a snapshot processing part implemented through executing a corresponding program by a processor of the information processing apparatus that is configured to store, into a D-VOL being a second logical volume, differential data generated by updating data of the P-VOL, and to manage a snapshot management table registered thereon, in association with a first block address identifying a first storage area of the P-VOL, a second block address identifying a second storage area of the D-VOL storing therein the differential data acquired for the first address, to reproduce a snapshot representing a state of the P-VOL at a certain time, wherein the snapshot processing part is configured to manage the D-VOL in accordance with a management method, which is any one of the following, listed in an order of increasing priority: wherein the methods are determined based on a use state comprising at least one of a number of access users, an access frequency, and a number of times of snapshot reference.