Having 4 environments including development, testing, pre-production/staging and production in a Big company would be good for best practices because in staging we can make sure that all are working properly. Of course the dev, testing and staging environments are smaller than planned production. For instance, if I take 2 nodes in dev, testing and staging then we can have a almost 8 nodes in production and again it's always depends on replication, traffic, and other relevant facts. Thanks! ... View more