nodeEvacInstance _ _ _ (Instance.Instance
                        {Instance.diskTemplate = DTFile}) _ _ =
                  fail "Instances of type file cannot be relocated"
nodeEvacInstance _ _ _ (Instance.Instance
                        {Instance.diskTemplate = DTFile}) _ _ =
                  fail "Instances of type file cannot be relocated"
nodeEvacInstance _ _ _ (Instance.Instance
                        {Instance.diskTemplate = DTFile}) _ _ =
                  fail "Instances of type file cannot be relocated"