[aluskuiuc]

I think if your app is a cluster that requires a quorum, 2 AZs just isn't enough - you need to be running in 3 to be tolerant to one going down.

[lotyrin]

Yep. Non-quorum members can even simply terminate existing connections and refuse new connections from clients, so clients are always either connected to a quorum node or not connected at all (CP, no A)