'Gets the LUNs for a volume.'

def _get_vol_luns(self, vol_name):

    api = netapp_api.NaElement('lun-list-info')
    if vol_name:
        api.add_new_child('volume-name', vol_name)
    result = self.connection.invoke_successfully(api, True)
    luns = result.get_child_by_name('luns')
    return luns.get_children()
