Tier IV classification system categorizes data centers based on availability, redundancy, and fault tolerance. A Tier IV data center is the highest level of classification in the system, designed to provide the highest level of availability and fault tolerance. It ensures 99.995% uptime, with a maximum of 26.3 minutes of annual downtime.
Tier IV data centers have redundant components and systems, including multiple independent power and cooling distribution paths, fully redundant power and cooling systems, and compartmentalized security zones.