[Image: This Chart Illustrates Tier Similarities and Differences. Image
Courtesy of The Uptime Institute]
A four tier system that provides a simple and effective means for identifying
different data center site infrastructure design
topologies. The Uptime Institute's tiered classification system is an industry
standard approach to site infrastructure functionality addresses common
benchmarking standard needs. The four tiers, as
classified by The Uptime Institute include the following:
Tier 1: composed of a single path for power and cooling
distribution, without redundant components, providing 99.671% availability.
Tier II: composed of a single path for power and cooling
distribution, with redundant components, providing 99.741% availability
Tier III: composed of multiple active power and cooling
distribution paths, but only one path active, has redundant components, and
is concurrently maintainable, providing 99.982% availability
Tier IV: composed of multiple active power and cooling
distribution paths, has redundant components, and is fault tolerant,
providing 99.995% availability.
Tier I sites will have computer power distribution and cooling but may not
have raised floors, UPSes, or engine generators. The critical load on these
systems is up to 100 percent of N. Even with a UPS or generator, they likely are
single-module systems and have many single points of failure. The infrastructure
should be completely shut down on an annual basis to perform preventive
maintenance and repair work. Urgent situations may require more frequent
shutdowns. Tier IV data centers have all the bells and whistles; everything
needed to keep them running without ever shutting down for maintenance, no
matter what happens. [Tier examples courtesy of
Processor: How's & Why's Of Data Center Tiers]
Bringing Manageability to the Data Center Every day, consumers and businesses around the world benefit from computerized, web-based services and transactions, thanks to data centers. Data centers house the computing, data storage, and networking equipment that make routine tasks faster, easier, and more accurate.
Processor: How's & Why's Of Data Center Tiers When it comes to data centers, being No. 1 is not the best. Data centers typically are ranked in tiers, with Tier I the most basic and prone to downtime and Tier IV the most robust, redundant, and functional.
Site Infrastructure Tier Certification The specifications listed on this web page have been established by the fifty-one members of The Uptime Institute's Site Uptime Network. These specifications pertain to all computer and communication equipment critical to maintaining uninterrupted information availability.
The Uptime Institute, Inc. Using benchmarking, abnormal incident data, and industry Best Practices collected from members of its knowledge communities, The Uptime Institute, Inc. (The Institute) has distilled uptime management into scientific disciplines and practices which can be confidently applied.
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