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What is Data Center Tiers?

Data centers are classified into four tiers - Tier I, Tier II, Tier III, and Tier IV by The Uptime Institute depending on the site infrastructure performance.

Tier I data centers have single power and cooling distribution path with no redundant IT components, providing 99.671% availability.

Tier II data centers consist of single power and cooling distribution path with redundant components, providing 99.741% availability.

Tier III data centers have two more than two active power and cooling distribution paths with redundant components, providing 99.982% availability.

Tier IV data centers are fault tolerant with multiple power and cooling distribution paths, providing 99.995% availability.

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