'Retrieve stats info from volume group.'

def _update_volume_stats(self):

    LOG.debug('Updating    volume    stats...')
    data = {}
    backend_name = self.configuration.safe_get('volume_backend_name')
    data['volume_backend_name'] = (backend_name or 'Generic_iSER')
    data['vendor_name'] = 'Open    Source'
    data['driver_version'] = '1.0'
    data['storage_protocol'] = 'iSER'
    data['pools'] = []
    self._update_pools_and_stats(data)
