def _start_cg_snapshot(self, volume_names, snapshot_name):
    snapshot_init = {'snapshot': snapshot_name, 'timeout': 'relaxed', 'volumes': [{'volume-name': volume_name} for volume_name in volume_names]}
    result = self.connection.send_request('cg-start', snapshot_init)
    return result.get_child_content('cg-id')
def _start_cg_snapshot(self, volume_names, snapshot_name):
    snapshot_init = {'snapshot': snapshot_name, 'timeout': 'relaxed', 'volumes': [{'volume-name': volume_name} for volume_name in volume_names]}
    result = self.connection.send_request('cg-start', snapshot_init)
    return result.get_child_content('cg-id')