Patent ID: 7117327
Filing Date: 2006-10-03
Classification: G06F,Y10S

Abstract:
1. A data processing system of the type comprising a plurality of storage systems each including a control section and storage devices whereby to have the functionality of storing data into storage areas, wherein the storage systems are interconnected by means of communication lines whereby replication of data is retained between the storage systems, wherein: a first storage system retains first data as replication target data, a second storage system retains second data as replication data of the first data, and a third storage system retains third data as replication data of the first data; in synchronization with data updating of the first data in the first storage system, the data processing system performs the processes of data updating of the second data stored in a data volume related to at least one disk drive in the second storage system in the second storage system, creating information regarding data updating of the first and second data as a journal including identifiers of data update sequence, and storing the journal into a journal volume related to at least one disk drive in at least any one of the first and second storage systems, wherein the journal is stored in at least one of the first and second storage systems after the updating of the first data in the first storage system; in asynchronization with the data updating of the first data in the first storage system, the data processing system performs transfer to store the journal into a journal volume related to at least one disk drive in the third storage system, and the third storage system performs data updating of the third data in accordance with the data update sequence in the first storage system by using the third journal.