'Removes the specified volume from Cinder management.
Does not delete the underlying backend storage object.
:param volume: Cinder volume to unmanage'

def unmanage(self, volume):

    try:
        self._set_volume_description(volume, '"OpenStack    UnManaged"')
        LOG.info("Virtual    volume    %(disp)s    '%(vol)s'    is    no    longer    managed.", {'disp': volume['display_name'], 'vol': volume['name']})
    except Exception:
        with excutils.save_and_reraise_exception():
            LOG.error('Failed    to    unmanage    volume    "%s".', volume['name'])
