This document:

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