Patent ID: 8307179
Filing Date: 2012-11-06
Classification: G06F

Abstract:
1. A storage system, comprising: a plurality of host computers; at least one storage subsystem; and a management computer, wherein each storage subsystem includes volumes storing data requested by the host computers to be written, the volumes including primary volumes from which data is copied, and secondary volumes to which data is copied, wherein the primary volumes and the secondary volumes form copy pairs, wherein the management computer is configured to: (A) obtain a plurality of copy pair definition information from each of the plurality of host computers, the plurality of copy pair definition information indicating associations between the primary volumes and the secondary volumes; (B) remove at least one duplicate copy pair definition information from the copy pair definition information obtained from the plurality of host computers by executing to: (G) collect copy pair statuses of the copy pairs from the at least one storage subsystem via each of the host computers, based on the copy pair definition information registered in the information obtaining definition table, to avoid obtaining copy pair status of the same copy pair more than once, wherein each of the host computers is assigned a priority level based on a predetermined criteria, and wherein the management computer is further configured to: determine if more than one of the host computers manages the same copy pair; and when it is determined that more than one of the host computers manages the same copy pair, obtain the copy pair definition information from a selected one of said more than one host computers, which selected one of the host computers has the lowest priority level, among said more than one host computers, based on said predetermined criteria.