I think that you should prewire experimental racks for power. By thisI don't mean just making sure that they have some PDUs in them; I meanrunning actual power cords up the sides, with unconnected ends tiedoff every so often ready to be plugged into machines. If you turn outto need more power cords for a machine, don't try to run more powercables along the side unless they too are going to be permanent; justdangle them down the back, where they are easy to

A modern Unix system carries around with it all sorts of historicalrelics . One of them is /usr/share , whichwas a relic of another era until recently (when multi-architecturemachines started appearing).

Once, by now long ago, disk space was a lot more limitedand heavily NFS dependent networks were much more common . Because disk space was so scarce, youdidn't put big locally-built programs like TeX or Emacs or the latestX Windows on every machine's disk; generally