query.addScalar("SIZE");
query.addScalar("available");
query.addScalar("used");
query.addScalar("elementname");
query.addScalar("STATE");
query.addScalar("tier");
Map<String, Object> params = new HashMap<String, Object>();
params.put("id_vdc", vdc.getId());
params.put("state", VolumeState.DETACHED.name());
params.put("storage_tecnology", "GENERIC_ISCSI");
query.setProperties(params);