@@ -686,12 +686,25 @@ func DeleteDevice(poolName string, deviceId int) error {

 }

 func ActivateDevice(poolName string, name string, deviceId int, size uint64) error {

+	return activateDevice(poolName, name, deviceId, size, "")

+}

+

+func ActivateDeviceWithExternal(poolName string, name string, deviceId int, size uint64, external string) error {

+	return activateDevice(poolName, name, deviceId, size, external)

+}

+

+func activateDevice(poolName string, name string, deviceId int, size uint64, external string) error {

 	task, err := TaskCreateNamed(DeviceCreate, name)

 	if task == nil {

 		return err

 	}

-	params := fmt.Sprintf("%s %d", poolName, deviceId)

+	var params string

+	if len(external) > 0 {

+		params = fmt.Sprintf("%s %d %s", poolName, deviceId, external)

+	} else {

+		params = fmt.Sprintf("%s %d", poolName, deviceId)

+	}

 	if err := task.AddTarget(0, size/512, "thin", params); err != nil {

 		return fmt.Errorf("Can't add target %s", err)

 	}