'Return the volume\'s no-data pages to the storage pool.'

def discard_zero_page(self, volume):

    ldev = utils.get_ldev(volume)
    try:
        self.run_raidcom('modify', 'ldev', '-ldev_id', ldev, '-status', 'discard_zero_page')
    except exception.VSPError:
        utils.output_log(MSG.DISCARD_ZERO_PAGE_FAILED, ldev=ldev)
