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> With AWS I could just set up a multi-availability-zone RDS deployment for the database and an auto-scaling group for the web tier and be confident that AWS wi

> With AWS I could just set up a multi-availability-zone RDS deployment for the database and an auto-scaling group for the web tier and be confident that AWS will recover the system from most failures "Confident"? "Most" failures? Are you merely hopeful that the probability of a bad failure is low, or are you able to test the AWS resiliency techniques you mention and to ensure that they stay working? At what cost?

milesvp 6y ago
My experience with RDS instances that had multi region failover, was that the failovers worked every time we needed them for deployments (I don’t think we ever needed them for RDS failures). The cost though was enormous. Our write db represented the lions share of our AWS cost, and doubling it for disaster mitigation increased our costs by something like 50%. It was mostly worth it from a business perspective when we were less sure about AWS uptimes, but I’m not sure I could keep justifying the cost given how little problems we had with RDS over time.