Patent ID: 7185228

Claim:
A method for controlling an information processing system essentially composed of a first storage apparatus equipped with a first logical volume, a second storage apparatus equipped with a second logical volume, a third storage apparatus equipped with a third logical volume, an information processing apparatus that accesses the first storage apparatus, a first communication module that communicatively connects the first storage apparatus with the second storage apparatus, and a second communication module that communicatively connects the first storage apparatus with the third storage apparatus, the method comprising the steps of: executing a replication management processing from the first logical volume to the second logical volume, wherein, upon receiving a data write request from the information processing apparatus, the first storage apparatus stores data in the first logical volume according to the data write request and also sends the data to the second storage apparatus, and upon receiving the data, the second storage apparatus stores the data in the second logical volume; executing a replication management processing from the first logical volume to the third logical volume, wherein, upon receiving a request to execute a failover from the information processing apparatus, the first storage apparatus sends the data to the third storage apparatus, and upon receiving the data, the third storage apparatus stores the data in the third logical volume; executing an initializing replication processing from the first logical volume to the second logical volume, when a content of the first logical volume is not consistent with a content of the second logical volume; and executing an initializing replication processing from the first logical volume to the third logical volume, when a content of the first logical volume is not consistent with a content of the third logical volume, wherein the first storage apparatus sends all data of the first logical volume to the second storage apparatus prior to executing the replication management processing from the first logical volume to the second logical volume, and, the second storage apparatus stores in the second logical volume all the data of the first logical volume to make the content of the second logical volume consistent with the content of the first logical volume.