Designing for Failure: Choosing the Right Level of Redundancy, Resilience, and Control
Outages don't care how many zones you have. Power failures, software updates, and backbone disruptions all have one thing in common: they do not respect architecture diagrams. Redundancy only works if it is designed at the correct layer. Every team believes they are covered, and yet, when something breaks, the failure reveals that what looked like protection was only an illusion.
