STORAGE SYSTEM AND RESTORE CONTROL METHOD

• Main Authors: NISHINA, Tadato, YAMAGA, Yusuke, MATSUSHITA, Takaki, KAWAGUCHI, Tomohiro
• Format: Patent
• Language: English
• Published: 29.07.2021
• Subjects: CALCULATING; COMPUTING; COUNTING; DATA PROCESSING SYSTEMS OR METHODS, SPECIALLY ADAPTED FORADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL, SUPERVISORYOR FORECASTING PURPOSES; ELECTRIC DIGITAL DATA PROCESSING; PHYSICS; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE,COMMERCIAL, FINANCIAL, MANAGERIAL, SUPERVISORY OR FORECASTINGPURPOSES, NOT OTHERWISE PROVIDED FOR

A storage system includes a business volume, a controller, and an additional write volume. The controller manages first address conversion information for managing a relationship between addresses of the business volume and the additional write volume, and address conversion history information for managing a relationship between the addresses of the business volume and the additional write volume and a time when the data of the business volume is updated as history information. The controller acquires a snapshot of the business volume at each time the data amount of the address conversion history information reaches a predetermined threshold, and stores a recovery point to the address conversion history information at each time a recovery point set command is received for the business volume. Further, when receiving a restore command, the controller restores the business volume using the acquired snapshot and the recovery point stored in the address conversion history information.