COMPUTER SYSTEM AND ITS DATA BACKUP METHOD

摘要

PROBLEM TO BE SOLVED: To perform high speed backup by preventing the lowering of performance of an online processing during a backup processing. SOLUTION: Data write from application 116 to an external storage device 160 is duplexed in storage areas 150, 151 by a middleware 117 on a server 110. A duplex operation is stopped in the case of a backup operation, a processing of the application is continued by using one storage area 150 and backup data are transferred from the other storage area 151 to a tape device 130 by a backup program 126 of a backup server 120 in the case of the backup. The duplex operation is restarted by the middleware 117 and the contents of two storage areas are resynchronized after the completion of the backup.