Patent ID: 8782358

Claim:
An apparatus for configuring transparent synchronous mirroring volume switching, comprising: a first volume; a second volume; a storage area network (SAN) configured to couple a host computer, the first volume and the second volume; a memory coupled to the second volume; and a processor configured: to map the first volume to the host computer, to initiate synchronization of status data between the mapped first volume and the second volume, to set the mapped first volume to an active state and the second volume to an inactive state, by setting a state of a first target port group comprising a port associated with the first volume to the active state, thereby setting a state of all logical paths between the host computer and the first volume to the active state, and setting a state of a second target port group comprising a port associated with the second volume to the inactive state, thereby setting a state of all logical paths between the host computer and the second volume to the inactive state, after setting the mapped first volume to the active state and the second volume to the inactive state and after the setting the state of the second target ort group, to copy the active first volume to the inactive second volume, the active first volume including a unique identifier identifying the active first volume, the unique identifier identifying the active first volume being copied to the inactive second volume, after copying the active first volume to the inactive second volume, to retrieve, by the host computer, the unique identifier identifying the first volume from the inactive second volume, after the unique identifier has been copied to the inactive second volume, and after retrieving the unique identifier, to map the inactive second volume to the host computer.