The basic approach is CP; if there is a sufficient network partition, writes will fail. But as long as a majority of the network is connected together, that po

The basic approach is CP; if there is a sufficient network partition, writes will fail. But as long as a majority of the network is connected together, that portion of the servers will be able to function normally (though there may be some extra latency); and traffic can be routed away from the unavailable node.