'Obtain status of the volume service.
:param refresh: Whether to get refreshed information'

def get_volume_stats(self, refresh=False):

    if (not self._stats):
        backend_name = self.configuration.safe_get('volume_backend_name')
        if (not backend_name):
            backend_name = self.__class__.__name__
        data = {'volume_backend_name': backend_name, 'vendor_name': 'VMware', 'driver_version': self.VERSION, 'storage_protocol': 'vmdk', 'reserved_percentage': 0, 'total_capacity_gb': 'unknown', 'free_capacity_gb': 'unknown'}
        self._stats = data
    return self._stats
