Patent 7234033 was granted and assigned to Hitachi on June, 2007 by the United States Patent and Trademark Office.
A processing system includes a local or local storage and a number of remote or remote storage systems that store data mirroring that maintained by the local storage system. Data that is written, changed, deleted or other wise modified by the local storage system is periodically sent to the remote storage systems to update the mirroring data maintained by each.