On Jul 7, 2018, at 7:54 AM, Gianluca Cecchi <gianluca.cecchi at gmail.com> wrote: > > I have yet to dig sufficiently deep in Warren considerations, but I will do > it, I promise! Very interesting arguments Until then, I offer this tl;dr: A 4-member cluster has distinct advantages over a 2x2 cluster of the same machines *if* the software running that cluster knows how to take the full available advantage of that configuration. That “if” is key. By it, I’m telling you I don’t know whether the clustering software you want to run uses a proper distributed consensus algorithm or is something simpler, like a blind mirroring system. If the latter, then the choice of configuration is purely an operational consideration, something only you can decide.