private void updateBlockMirror(
     CIMInstance volumeInstance, BlockMirror mirror, Map<String, Object> keyMap) {
   mirror.setAllocatedCapacity(
       Long.parseLong(getCIMPropertyValue(volumeInstance, EMC_ALLOCATED_CAPACITY)));
   mirror.setProvisionedCapacity(returnProvisionedCapacity(volumeInstance, keyMap));
   _updateMirrors.add(mirror);
 }