You can trivially redirect all clients to node 1 whether or not there is a partition, and voila, you have a CAP system under that definition. If clients can be

You can trivially redirect all clients to node 1 whether or not there is a partition, and voila, you have a CAP system under that definition. If clients can be partitioned from servers then we're back in the original scenario in which switching is not allowed: just partition each client from all but one server (but a different server for each client). Maybe there is a way to modify the CAP theorem so that it says something non-trivial (e.g. a theorem about the limit of how many node failures a Paxos-like algorithm can handle, but even this is probably trivial, namely half), but the CAP theorem as stated by the originators is trivial, and the proof is a dressed up version of what I stated above. I don't think the authors would disagree with this at all, since they explicitly state: "The basic idea of the proof is to assume that all messages between G1 and G2 are lost. If a write occurs in G1 and later a read occurs in G2, then the read operation cannot return the results of the earlier write operation." Isn't it interesting that such a paper has 1600 citations and has reshaped the database industry?