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A Tier 1 data centre has a single path for power and cooling and few, if any, redundancy and backup components. It has an expected uptime of 99.671% (28.8 hours of downtime annually).
A Tier 2 data centre has a single path for power and cooling and some redundancy and backup components. It has an expected uptime of 99.741% (22 hours of downtime annually).
A Tier 3 data centre has multiple paths for power and cooling and systems in place to update and maintain it without taking it offline. It has an expected uptime of 99.982% (1.6 hours of downtime annually).
A Tier 4 data centre is built to be completely fault-tolerant, and has redundancy for every component. It has an expected uptime of 99.995% (26.3 minutes of downtime annually).
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