Optimal configuration for more than 3 DCs

[alexmiller]

I think most of this was answered in:

Replication method consideration

We don’t have a great answer to having one cluster that offers >1 DC of fault tolerance yet. Though it’s theoretically possible to run three_datacenter mode with more than three datacenters, I think we discovered that an assertion will accidentally fail if you try and run it with >3 datacenters, thus proving that no one has tried to so far. Three datacenter mode will eventually be deprecated in favor of multi-region, but multi-region currently only supports 2 regions at most. The only way to …

And I’d be happy to expand on any part of that if you’d like.