SNAPSHOT ACQUISITION METHOD, SNAPSHOT ACQUISITION DEVICE, AND COMPUTER PROGRAM PROVIDED WITH SNAPSHOT ACQUISITION FUNCTION

摘要

PPROBLEM TO BE SOLVED: To enable data to be effectively utilized for each generation by execution of snapshot processing and to eliminate unnecessary generation management. PSOLUTION: A storage system 100 has a difference data storage area 120 in order to perform generation management of difference data of a snapshot object device 110. A snapshot command control part 200 accepts a command issue request of snapshot control from the side of a server 300 and performs command processing. The storage system 100 is provided with a snapshot designation update capacity management part 210 having a function of executing processing of capacity management of update differences of snapshots, comparison and discrimination between a preliminarily designated update capacity and an actual update capacity, and temporary generation management of update differences according to the designated update capacity, and a snapshot designation capacity report part 220 having a function of reporting a management condition and a processing result to the side of the server in accordance with the capacity management of the update difference and generation management when necessary. PCOPYRIGHT: (C)2005,JPO&NCIPI