On Jul 7, 2018, at 7:54 AM, Gianluca Cecchi <[email protected]> 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.
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