Exadata: NFS mounts unavailable after applying kernel update

I talk about testing suites a lot, so this one falls under the category of OS validation from My Oracle Support article "NFSv3 Exports Not Mounting After Exadata Node Upgrade From OL5.10 To OL6.6" from document ID 2006173.1 because applying Exadata patch 12.1.2.1.0 does upgrade the OS as well just in case you were not prepared for that.  This is where a testing (or validation) suite comes in handy because it could find that your system has changed in such a way, and then warn you when you do this in QA so you can start looking for problems proactively which may now affect you due to the change!