Numerical Ranking Terminology Summary Definition 1 Unreliable Shared power and cooling No generator No fire separation (standard construction materials) No fire suppression 2 Unreliable/Improved Power Dedicated Unconditioned Power Shared building cooling No generator, no TVSS Non-redundant air conditioning No fire separation Wet or no sprinklers 3 Unreliable-Improved Power/Cooling Independent power and cooling No UPS, generator … Continue reading Data Center Reliability Levels