Patent ID: 8762663

Claim:
A method, comprising: configuring transparent synchronous mirroring volume switching for a first volume and a second volume that are coupled, via a storage area network, to a host computer, with the first volume mapped to the host computer, by: initiating synchronization of status data between the first volume and the second volume; setting the 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 first volume to the active state and the second volume to the inactive state and after the setting the state of the second target port group, copying 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, retrieving, by the host computer, the unique identifier identifying the first volume from the inactive second volume; and after retrieving the unique identifier, mapping the inactive second volume to the host computer.