Patent ID: 7185152
Filing Date: 2007-02-27
Classification: G06F

Abstract:
1. A remote copy system comprising; a first storage apparatus, including a first controller and a first logical volume, to be coupled to an information processing apparatus; a second storage apparatus including a second controller and a second logical volume; and a third storage apparatus including a third controller and a third logical volume, wherein when data from the information processing apparatus to the first logical volume are received by the first storage apparatus, the first storage apparatus transmits the data to the third storage apparatus to store the data in the third logical volume, transmits a completion report of writing to the information processing apparatus after transmitting the data to the third storage apparatus, and stores the data in the first logical volume, wherein the first storage apparatus transmits portions of data of the first logical volume to the second storage apparatus, based on predetermined events, to store the portions of data in the second logical volume, wherein the third storage apparatus has location information, recorded in a plurality of memory areas in the third storage apparatus, and indicating storing locations, in the third logical volume, of data received from the first storage apparatus, and wherein the third storage apparatus deletes a part of the location information recorded in one of the plurality of memory areas in the third storage apparatus at a timing related to at least one of the predetermined events.