Hitachi, Ltd.

Yusuki Hirakawa

Yoshihiro Asaka

Toru Suzuki

Shuji Kondo

A first storage subsystemA includes a first storage deviceAand one or more second storage devicesAA. A second storage subsystemB includes a third storage deviceBand a fourth storage deviceB. A third storage subsystemC comprises a fifth storage deviceCand a sixth storage deviceC. The first storage subsystemA generates a data set comprising an update number expressing the update order of the first storage deviceAand write data stored in the first storage deviceA, stores the generated data set in the one or more second storage devicesAA, and transmits the data set to the second and third storage subsystemsB,C. Each of the second and third storage subsystemsB,C stores the received data set in the third storage deviceBor fifth storage deviceC, reads a data set from the third or fifth storage deviceBCaccording to the update number, and stores the write data within the data set in the fourth storage deviceBor sixth storage deviceC

Growing community of inventors

Odawara, Japan

Yusuki Hirakawa