Alcance
This document:a) defines metrics as key performance indicators (KPIs) for resilience, dependability, fault tolerance and availability tolerance for data centres;b) covers the data centre infrastructure (DCI) of power distribution and supply, and environmental control;c) can be referred to for covering further infrastructures, e.g. telecommunications cabling;d) defines the measurement and calculation of the KPIs and resilience levels (RLs);e) targets maintainability, recoverability and vulnerability;f) provides examples for calculating these KPIs for the purpose of analytical comparison of different DCIs.This document does not apply to IT equipment, cloud services, software or business applications.