Do not forget about the netsplit scenarios. In the case you have two datacenters, and one has network problems, you will end up in a split-brain scenario. Both

Do not forget about the netsplit scenarios. In the case you have two datacenters, and one has network problems, you will end up in a split-brain scenario. Both datacenters may believe they are available or down. A way to solve this, could be to use more boxes and majority voting, with something like apache zookeeper. But none of this comes out of the box.