| 摘要 |
The present invention, when an external device accesses a third storage device in a prescribed environment, increases the likelihood of data in the third storage device being updated in the order in which data in a first storage device is updated, without the need for complex operations by a user. More specifically, when difference information 13 comprising a data group, which represents differences between a data group inside a P-storage device 10 P and a data group inside an SP-storage device 11 SP, is transmitted, a first storage subsystem 5 sends an interrupt command and a restart command such that the difference information 13 is interposed therebetween, and a third storage subsystem 7 receives the interrupt command and restart command by way of a second storage subsystem 6 , and based on these commands, writes the data group inside the difference information 13 to an S-storage device 12 S.
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