Patent ID: 7243116
Filing Date: 2007-07-10
Classification: G06F,Y10S

Abstract:
1. A storage system, comprising: a controller coupled to one or more host computers and transferring data sent from one or more said host computers to one or more first logical volumes; and a plurality of disk drive units having a plurality of disk drives which relate to said first logical volumes; wherein said controller is adapted to receive a command sent from one of said host computers to create a plurality of pair relationships between said one or more first logical volumes and a plurality of second logical volumes based on said command, said second logical volumes being used to store copies of data stored in said first logical volumes, and to direct said created pair relationships to a split status in which said second logical volumes can be accessed from one or more of said host computers, based on said command, wherein said first logical volumes or said second logical volumes belong to a consistency group in which consistency among data stored in said second logical volumes at a timing of starting said split status is maintained.