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CONCEPT Cited by 1 source

Reliability-velocity duality

Definition

Reliability-velocity duality is the engineering philosophy that reliability and velocity of innovation are not opposing forces but "two facets of the same coin" — you cannot sustainably have one without the other.

Meta's canonical statement (2026): "Reliability and velocity are two facets of the same coin. You cannot have one without the other." The ability to recover a region from instantaneous failure lays a strong foundation that enables:

  • Innovating in DC designs and validating them quickly
  • Building reliability in lockstep with rapid capacity deployments
  • Pushing the envelope further in what risks the infrastructure can tolerate

Distinction from "Move Fast and Break Things"

The duality is not the tolerance of production breakage as a velocity tax. It's the claim that investing in reliability enables velocity — because engineers can innovate aggressively only when the recovery infrastructure exists to catch failures from that innovation. Absent the recovery capability, each new DC design or capacity deployment carries unacceptable risk that forces conservative (slow) rollout.

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