Patent ID: 7418564

Claim:
A storage control system comprising: a host system; and a storage controller, wherein the storage controller comprises a storage device and performs a data processing between the storage device and the host system in response to a request from the host system, wherein the storage controller further comprises: a primary volume having a file system accessible from the host system; a secondary volume mirroring the primary volume; a controller for performing release processing to release mirroring between the primary volume and the secondary volume with access from the host system to the primary volume being permitted; a management server for executing a management program for examining volume management information about the secondary volume after the release processing; a second storage controller at a remote site, the second storage controller having at least one volume in which a backup copy of content of the secondary volume is made, wherein the at least one volume of the second storage controller includes a first volume in which a copy of a file system of the secondary volume is made, and a second volume in which a copy of content of the first volume is made, and wherein when the management program examines a file system of the first volume, and if it determines that the file system has no errors, the first volume is reproduced in the second volume.