[nonane]

> This affected a single az in a single region. If it caused you downtime or a partial outage, it means you are not fully resilient to single az failures.

This is not true. Amazon is not being upfront about what happened here. It was simply not a single AZ failure. Our us-east-1 ELB load balancers were hosed and were unable to direct traffic to other AZs - they simply stopped working an were dropping traffic. We tried creating load balancers in different AZs and that didn't work either.

How can you be resilient to single AZ failures if load balancers stop working region wide during a single AZ outage?

[acdha]

Did your TAM go into any details on that? Over a couple hundred load-balancers, the only issue we had was taking longer to register new instances and that affected only a couple of them. Running services weren't interrupted, latency remained, etc. which is what I'd expect for a single AZ failure.