| 摘要 |
It is an object of the present invention to conduct data transfer or data copying between a plurality of storage systems, without affecting the host computer of the storage systems. Two or more auxiliary storage systems 100 B, 100 C are connected to a primary storage system 100 A connected to a host device 180 . The auxiliary storage systems 100 B, 100 C read journals of data update from the primary storage system 100 A at respective independent timings, save the journals in prescribed logical volumes JNL 2 , JNL 3 , produce copying of the data present in the primary storage system 100 A based on the journals present in the logical volumes JNL 2 , JNL 3 at the independent timings, and save the copies in auxiliary logical volumes COPY 1 , COPY 3 . The primary storage system 100 A holds the journals till both auxiliary storage systems 100 B, 100 C read the journals and restore. The timing of journal read can be controlled according to the journal quantity, processing load, and the like.
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