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.
Most commercial data centers are Tier III; instead of using Tier IV datacentres, many large service providers typically use multiple availability zones to implement of their services, thus achieving greater resilience than would be possible with any single data centre.
[citation needed] The data center tier system was created by the Uptime Institute.
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