'Gathers array stats and converts them to GB values.'

def _update_volume_stats(self):

    data = self.common._get_volume_stats(self.configuration.san_ip)
    backend_name = self.configuration.volume_backend_name
    data['volume_backend_name'] = (backend_name or self.__class__.__name__)
    data['driver_version'] = self.VERSION
    data['storage_protocol'] = 'iSCSI'
    for i in data:
        LOG.debug('stat    update:    %(name)s=%(data)s', {'name': i, 'data': data[i]})
    self.stats = data
