Patent ID: 7469358
Filing Date: 2008-12-23
Classification: G06F

Abstract:
1. A storage system configured to be connected to a plurality of computers, the storage system comprising: at least one storage device which comprises a data storage area being configured to store data received from at least one of the plurality of computers, a journal storage area being configured to store a plurality of journal data and a plurality of recoverable points, and a backup storage area being configured to store backup data of data stored in the data storage area at a point, one of the plurality of journal data corresponding to data stored in the data storage area, and one of the plurality of recoverable points being set to recover data stored in the data storage area at a point corresponding to the one of the plurality of recoverable points if the one of the plurality of recoverable points is designated in future; and a controller which is configured to be connected to the plurality of computers and the at least one storage device and controls a block access request received from at least one of the plurality of computers, wherein the controller comprises: a memory which stores at least one of the plurality of recoverable points, wherein said controller is configured to send information of the plurality of recoverable points to at least one of the plurality of computers by managing the plurality of recoverable points, and to recover data of the data storage area corresponding to a designated recoverable point, designated by the at least one of the plurality of computers, which receives the information of the plurality of recoverable points from the controller, by using a journal data, stored in the journal storage area and corresponding to the designated recoverable point, and the backup data stored in the backup storage area, and wherein an oldest journal data stored in the journal storage area is removed from the journal storage area, after data corresponding to the oldest journal data is written to the backup storage area.