Patent ID: 7640411
Filing Date: 2009-12-29
Classification: G06F,Y10S

Abstract:
1. A remote copy system comprising: a first storage system coupled to an information processing apparatus; and a second storage system coupled to the first storage system to receive data from the first storage system; wherein the first storage system has a first storage area in which the data sent from the information processing apparatus is written; the second storage system has a logical address for a write destination of the data sent from the first storage system, and also has a second storage area in which data and update information, which should be written to the logical address, are stored when a storage area is not allocated to the logical address, wherein when the storage area is not allocated to the logical address, the second storage system is configured to copy the data and the update information from the second storage area to a third storage system so that the data of the first storage area is mirrored at a storage area of the third storage system and the second storage system maintains only a portion of the data of the first storage area.