[batbomb]

So the acceptor is a replica-read-only machine and a client-propose-commit-only machine.

Also, the minimum production setup for this cluster is 6+1 machines?

[topher-the-geek]

Ah, I see how you could interpret the diagram that way. The client and server are clearly different machines. However, the replicas and acceptors can be on the same machine, in fact in the same process. And the server can be on the same machine as a replica or acceptor. So only three machines are necessary.