Thanks! Certainly multi-AZ setups are not magical. I just wanted to know how it's now done on-prem, what are the tools, solutions, approaches. Doing this in a cost-effective way for 1000 servers likely takes different tools than doing this at a major cloud provider scale.

One thing that's more "magical" in AWS is S3. Their architecture is impressive, see e.g. https://www.allthingsdistributed.com/2021/04/s3-strong-consi...