VMWare
I finally got around to upgrading my home VMWare cluster from eSXi 5.5 to eSXi 6.5. Since moving the datastores to a shared NFS mounted ZFS array over 10gig ethernet things like this are much easier. I know Matthew R. Wilson will look down on me for not using something else, but eSXi is so damn convient.
Everything fired right back up after the upgrade, including my home Hadoop cluster.