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http://www.colocationamerica.com/data_center/tier-standards-overview.htm - Based on The Uptime Institute data tier standards, there are four tiers that classify the site-level infrastructure of data centers as a means of evaluations. Understanding the data tier standards is a necessary task when considering a hosting service. If you need a short term, cheap, and fast data center, go with Tier 1 and 2 Data Centers. For more long term, dependable, and fault tolerant hosting services, seek a Tier 3 and 4 Data Center.
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