To rapidly restart processing in a second site when a first site is struck by a disaster.
When data to be written in a first logical volume are received, a first storage device transmits the data to a third storage device for storing them in a third logical volume; the third storage device transmits a writing completion report after receiving the data and manages them as data of a second state to be transmitted to a second storage device after an event; when the event occurs, the first storage device manages them as data of a first state to be transmitted to the second storage device before the next predetermined event, and transmits the data to the second storage device; the third storage device manages positional information related to a position where the data received from the first storage device are stored in the third logical volume; and the third storage device clears the positional information related to the data corresponding to the data received by the second storage device before the event at timing synchronized with the event.
SATO TAKAO
OZAWA MASAJI
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