Asynchronous remote copy

摘要

To provide a disk subsystem that assures the sequence and the coherence of data update regarding two or more disk subsystems, and to provide an asynchronous type remote copy function, a main center (9) that is a computer system having the configuration of slave subsystems (3-2 to 3-n) connected with a master disk subsystem (3-1) secures the coherence between data of the main center (9) and the remote center (10) at the temporary suspension by repeating temporary suspension and release of the temporary suspension of the remote copy by a master subsystem (3-1) at predetermined opportunities, and by repeating temporary suspension and release of the temporary suspension of the remote copy by slave subsystems (3-2 to 3-n) interlocking with it.