Three steps forward, 2 steps back, we should be stable.
Nerd stuff: We upgraded our infrastructure, again. We moved from a copper to a fiber backbone. Server links are now up to 25Gbit/second. Everything went smoothly until we started our final tests. It appears that the new switch defaulted ports in the wrong direction.
This default blocked traffic from our distributed network file system. The switch has been beaten into submission, and is now performing its duties correctly.