4th Floor, 4 Tabernacle Street London EC2A 4LU

Datacentre – classifications

Tier LevelRequirements
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