Patent 7472241 was granted and assigned to Hitachi on December, 2008 by the United States Patent and Trademark Office.
A storage system and a backup method achieving enhanced reliability without degradation in the performance of the entire system. A first storage apparatus stores data transmitted from a host system and transmits it to a second storage apparatus and a third storage apparatus. The second storage apparatus and the third storage apparatus store the data transmitted from the first storage apparatus and verify the consistency in the data between themselves.