Returns a `list` of all the `Volume` known to the cluster.  Updates every time - no caching.
        :return: a `list` of all the `Volume` known to the cluster.
        :rtype: list

def volumes(self):
        """
        Returns a `list` of all the `Volume` known to the cluster.  Updates every time - no caching.
        :return: a `list` of all the `Volume` known to the cluster.
        :rtype: list
        """
        self.connection._check_login()
        response = self.connection._do_get("{}/{}".format(self.connection._api_url, "types/Volume/instances")).json()
        all_volumes = []
        for volume in response:
            all_volumes.append(
                SIO_Volume.from_dict(volume)
            )
        return all_volumes