It maybe a suprise for you, but atf runs of our test suite didn't work before with / on NFS. Some tests failed and could fill up /tmp (if on tmpfs), which then would cause more test failures. See PR bin/48892 for an example and more details.
Of course this was due to bugs - and those have now been fixed, at least my recent evbarm test run (on a diskless GuruPlug) had no spurious fallout. This is nice, as setting up a test environment on an NFS server is easy and now we can quickly do full test runs without touching the system installed on the test machine itself. Martin
