@tjyang Interesting. I’m quite unfamiliar with pacemaker setup or architecture, mainly high level diagrams with very little hands on experience. I haven’t used corosync or drbd8 at all.
ManageIQ and postgresql are moving toward logical replication, pglogical for pg 9.x versions, then with postgresql itself when it’s included in pg 10.
@gtanzillo @carbonin Can probably provide better suggestions or comments here.