Patent ID: 7447855
Filing Date: 2008-11-04
Classification: G06F,Y10S

Abstract:
1. A data processing method in a system having a first storage system that is configured to couple to a host device and configured to send and receive data to and from the host device; a second storage system that is coupled to the first storage system and configured to receive data from the first storage system; and a third storage system that is coupled to the first storage system and configured to receive data from the first storage system, wherein the first storage system includes a first storage area that is configured to store data written from the host device, and a second storage area that is configured to store the data written from the host device and update information relating to a write order of the data, the data processing method comprising the steps of: transmitting, by the first storage system, the data to the second storage system synchronously with receiving the data from the host device, and transmitting the data and the update information relating to the write order of the data to the third storage system asynchronously with receiving the data from the host device, storing, by the second storage system, the data received from the first storage system in a third storage area, and storing data received from the first storage system and update information relating to the write order of the data in a fourth storage area in order to transmit the data and the update information stored in the fourth storage area to the third storage system in case of failure of the first storage system, storing, by the third storage system, the data and the update information read from the second storage area in a fifth storage area and storing the data included in the fifth storage area in a sixth storage area according to the update information included in the fifth storage area, and writing, by the third storage system, the data and the update information received from the first storage system in the fifth storage area, and writing the data stored in the fifth storage area in the sixth storage area according to the update information stored in the fifth storage area.