Lights Out, Systems On: Validating Instant Power Loss Readiness

Meta introduced Instantaneous PowerLoss Storm to validate data center resilience against instant power loss.

• •Implemented defense-in-depth with batteries, Power Loss Siren, and unavailability events signaling
• •Resolved circular dependency risks during bootstrapping using Belljar tests and recovery kit
• •Fixed "boomerang" effect where shutdown signals impacted orchestrator control plane
• •Validated incrementally via shadow regions then larger production regions
• •Established acceptable vs. unacceptable impact thresholds

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