Defined levels of resiliency and redundancy for IT infrastructure
Data centre tiers are defined levels of resiliency and redundancy for IT facility infrastructure. They are widely used in the data center, ISP and cloud computing industries as part of the engineering design for high availability systems.
The standard data center tiers are:[1]
Tier I: no redundancy
Tier II: partial N+1 redundancy
Tier III: full N+1 redundancy of all systems, including power supply and cooling distribution paths
Tier IV: as Tier III, but with 2N+1 redundancy of all systems
A Tier III system is intended to operate at Tier II resiliency even when under maintenance; a Tier IV system is intended to operate at Tier III resiliency even when under maintenance.
Most commercial data centers are Tier III; large service providers typically use multiple availability zones to implement resilience of their services.[citation needed]
The data center tier system was created by the Uptime Institute.[2]
^"Breaking Down Data Center Tier Level Classifications". www.coresite.com. Retrieved 2023-09-15.
^"Tier Classification System". Uptime Institute. Retrieved 2023-09-15.
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