Patent ID: 7555623
Filing Date: 2009-06-30
Classification: G06F,H04L

Abstract:
1. A computer system comprising: at least one storage having one or more volumes configured to serve as a storage region, including a copy source volume and a copy target volume which may be selectably PAIRED or SPLIT; a managing computer for managing the storage, and including user management information, operation management information and PAIR management information, where: a plurality of host computers including a first host corn outer and a second host computer, each host computer being used by a user capable of obtaining an operation authority over a volume in the storage, where the storage, the managing computer, and the host computers being interconnected via a network, and two or more users being capable of concurrently having the operation authority for an identical volume; wherein if a current status is the PAIR status, the management computer upon: A) receiving a first request from the second user to enable access of the copy target volume by the second host computer identified, decides that the first request is not allowed based on the user management information, the operation management information and the PAIR management information, and sends an error message; B) receiving a second request from the first user to change a status from the PAIR WITH BACKUP ENABLED to SPLIT, decides that the second request is allowed based on the user management information, the operation management information and the PAIR management information, and sends a PAIR SPLIT request to the storage apparatus; C) receiving a third request from the first user to resynchronize to the PAIR status, decides that the third request is not allowed based on the user management information, the operation management information and the PAIR management information, and sends an error message; and, D) receiving the first request after completion of B), decides that the second request is allowed based on the user management information, the operation management information and the PAIR management information, and sends a PATH creation request to the storage apparatus.