I would also add that the replica set concept that is based on Raft [0] allows for built-in high availability, so the individual servers can be maintained while

I would also add that the replica set concept that is based on Raft [0] allows for built-in high availability, so the individual servers can be maintained while the whole set is running and servicing clients. [0] https://en.wikipedia.org/wiki/Raft_(computer_science) https://en.wikipedia.org/wiki/Raft_(computer_science)