Datacentre No Comments 10 Tue Datacentre – classifications Datacentre – classifications Tier Level Requirements 1 Single non-redundant distribution path serving the IT equipment Non-redundant capacity components Basic site infrastructure guaranteeing 99.671% availability 2 Fulfils all Tier 1 requirements Redundant site infrastructure capacity components guaranteeing 99.741% availability 3 Fulfils all Tier 1 & Tier 2 requirements Multiple independent distribution paths serving the IT equipment All IT equipment must be dual-powered and fully compatible with the topology of a site’s architecture Concurrently maintainable site infrastructure guaranteeing 99.982% availability 4 Fulfils all Tier 1, Tier 2 and Tier 3 requirements All cooling equipment is independently dual-powered, including chillers and Heating, Ventilating and Air Conditioning (HVAC) systems Fault tolerant site infrastructure with electrical power storage and distribution facilities guaranteeing 99.995% availability
