Patent ID: 7055057
Filing Date: 2006-05-30
Classification: G06F

Abstract:
1. A control method for a storage system comprising: a first information processing device; a second information processing device which is connected so as to be capable of communicating with the first information processing device, and which constitutes a cluster with the first information processing device; a first storage device which is connected so as to be capable of communicating with the first information processing device, and performs writing/reading of data to a first storage area according to a data input/output request transmitted from the first information processing device; and a second storage device which is connected so as to be capable of communicating with the second information processing device, and performs writing/reading of data to a second storage area according to a data input/output request transmitted from the second information processing device; wherein the first storage device and the second storage device are connected so as to be capable of communicating with each other; the second storage device, during a first processing in which the first storage device transmits to the second storage device a replication of the data written to the first storage area, and the second storage device that received the data writes the data to the second storage area, requests first information from the first storage device indicating that a replication of the data written in the first storage area has not yet been transmitted to the second storage device and that the replication of the data has not been written to the second storage area when notice of failover is received from the second information processing device; the second storage device notifies the second information processing device that a data input/output request can be received when the first information is received from the first storage device; and the second storage device refers the first information upon receipt of a data read request transmitted from the second information processing device in which failover has occurred, requests the target data of the data read request from the first storage device when it is concluded that the target data of the data read request are stored in the first storage area, and transmits to the second information processing device the target data of the data read request transmitted from the first storage device as per the request.