Which tier of data center includes redundant capacity components?

The tier of data center that includes redundant capacity components is Tier III. This tier is designed to provide a higher level of redundancy and availability compared to Tier I and Tier II. In a Tier III data center, redundant systems, such as power and cooling, ensure that operations can continue even if one component fails. The key feature of Tier III data centers is that they allow for maintenance and upgrades without disrupting services, thanks to the concurrent maintainability of its infrastructure.

Tier I data centers have no redundancy and are suitable for non-critical applications, while Tier II facilities offer some redundancy but do not provide the same level of reliability as Tier III. Tier IV offers even greater redundancy and fault tolerance than Tier III, with multiple active power and cooling distribution paths. Therefore, the presence of redundant capacity components is a defining characteristic of Tier III, marking it as a critical tier for organizations that require high availability.