There is no configuration difference at this point. I think there was one initially ages ago. The only difference between MMR and mirror-mode MMR is that in the latter case, writes only go to a single master instead of any master in the cluster."Writes only go to one master in the cluster." What happens if they don't? If I DNS round-robin a pair of systems and MirrorMode them, what happens?
Then they aren't mirror mode, and any persistent client is going to be writing to whatever master it first connected to. DNS round-robin will never guarantee you are in mirror mode.
In other words, if N-Way supports two masters writing while MM does not, how can it not have a different configuration?
It has nothing to do with configuration of MMR, which I think is the point you're missing. It has purely to do with configuring it so only one master ever takes writes at a given time. With writes only ever going to one master, you have a 100% guarantee you'll never get a conflict between two masters. Which you essentially get with delta-syncrepl MMR anyway.
I seem to remember MirrorMode being very easy to set up yet N-Way taking significantly more time but looking back at the docs I think that's just a matter of the syncrepl setups taking a bit of effort.
Correct. A replica can only talk to a single "master". If you set up mirror mode, then the replica can purely talk to the load-balance name, and never have an issue if one of the masters in the cluster goes down.
--Quanah -- Quanah Gibson-Mount Sr. Member of Technical Staff Zimbra, Inc A Division of VMware, Inc. -------------------- Zimbra :: the leader in open source messaging and collaboration