Tier 1 Data Center

What Does Tier 1 Data Center Mean?

A Tier 1 data center is a type of data center that has only one source of servers, network links and other components. It is one of the simplest forms of data center tiers and lacks any redundant or backup supply of data center infrastructure components and operational services.


A Tier 1 data center is also known as a Level 1 data center.

Techopedia Explains Tier 1 Data Center

A Tier 1 data center is the basic-intermediate level of data center tiers.

Introduced by the Uptime Institute, it is used to provide neutral classification of data centers, in terms of availability. A Tier 1 data center only has essential components or data center infrastructure and is not suited for enterprise or mission critical data center services, as it lacks any redundant source of servers, network/Internet links, storage, power and cooling resources.

Typically, a Tier 1 data center guarantees 99.671 percent availability and has an average of 28.8 hours of downtime per year.


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Margaret Rouse is an award-winning technical writer and teacher known for her ability to explain complex technical subjects to a non-technical, business audience. Over the past twenty years her explanations have appeared on TechTarget websites and she's been cited as an authority in articles by the New York Times, Time Magazine, USA Today, ZDNet, PC Magazine and Discovery Magazine.Margaret's idea of a fun day is helping IT and business professionals learn to speak each other’s highly specialized languages. If you have a suggestion for a new definition or how to improve a technical explanation, please email Margaret or contact her…