'Removes the specified volume from Cinder management.
Does not delete the underlying backend storage object. A log entry
will be made to notify the Admin that the volume is no longer being
managed.
:param volume: Cinder volume to unmanage'

@utils.trace_method
def unmanage(self, volume):

    try:
        qos_policy_group_info = na_utils.get_valid_qos_policy_group_info(volume)
        self.zapi_client.mark_qos_policy_group_for_deletion(qos_policy_group_info)
    except Exception:
        pass
    super(NetAppCmodeNfsDriver, self).unmanage(volume)
