On Thu, 3 Sep 2015, Jeremy White wrote: [...]
How many boxes should we buy? If I read Francois's notes on the default configuration, it seems like the pipe was originally '3', which implies two more boxes should do it.
Yes, two extra boxes should maintain the old status-quo.
That sound right? And would a pair of i5s with fast hard drives and 8G of RAM do the trick?
One aspect that I think is important is to ensure that the processor support the virtualization instructions. For Intel that's VT-x and VT-d and Intel tends to turn these features on and off at random across their processor range. So before buying a processor I'd recommend checking it out on http://ark.intel.com/.