'Get snapVx information associated with a volume.
:param array: the array serial number
:param source_device_id: the source volume device ID
:returns: message -- dict, or None'

def get_volume_snap_info(self, array, source_device_id):

    resource_name = ('%(device_id)s/snapshot' % {'device_id': source_device_id})
    return self.get_resource(array, REPLICATION, 'volume', resource_name, private='/private')
