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Definition - What does Data Center Tier Levels mean?
"Data centre tier levels refer to a data centre's ability to maintain functionality during various kinds of failures, such as power outages. Higher tier levels indicate more sustainability for data centre operations and fault-tolerant systems that will allow for uninterrupted use during certain kinds of emergencies or crises.
As more advanced technology has led to a greater evaluation of fault tolerance for data systems and other business processes, the global IT community has defined data centre reliability by referring to up to four tiers for data centre operations. Groups such as the Uptime Institute, a global research organization, have defined these tiers and provided certifications for data centre systems.
Techopedia explains Data Center Tier Levels
In a Tier 1 data centre, system processes are carried out through a single path in a non-redundant system that does not offer fault tolerance. In a Tier 2 system, there may be some redundant features, for example, in climate and energy source support. Tier 3 systems will typically have more comprehensive protections for power outages and will have what’s called N+1 redundancy, which is a reliable backup power system. The highest level, Tier 4, will involve fully fault-tolerant systems around energy supply, storage and data distribution and backup power sources for climate control systems. These specifications for data centre sustainability help to create a consistent standard in the business world where vendors, clients and others typically refer to these various tier levels when planning, creating and implementing data centres in individual corporate or small business environments."