private void addVolumeToBlockConsistencyGroup(URI cgUri,Volume volume){
  volume.addConsistencyGroup(cgUri.toString());
  _dbClient.persistObject(volume);
}

private void addVolumeToBlockConsistencyGroup ( URI cgUri , Volume volume ) { volume . addConsistencyGroup ( cgUri . toString ( ) ) ; _dbClient . persistObject ( volume ) ; }
associates a volume with a given blockconsistencygroup uri .
