Jepsen isn't a real world test either. Also PostgreSQL HA has two options, either you have 1 Master and 1 Sync or 1 Async, if you have a Async Secondary it wil

Jepsen isn't a real world test either. Also PostgreSQL HA has two options, either you have 1 Master and 1 Sync or 1 Async, if you have a Async Secondary it will of course loose data. Also you will have a short downtime on switchover.