Immaculate server uptime is a term used to describe server uptime. Data centers are classified into four tiers or levels based on their server uptimes. These standards have been developed by the Uptime institute.
- Tier I: It comprises a single path for power and cooling distribution, without redundant components, and provides 99.671% availability.
- Tier II: It comprises a single path for power and cooling distribution, with redundant components and provides 99.741% availability.
- Tier III: It comprises multiple active power and cooling distribution paths, but only one path is active. It has redundant components and is concurrently maintainable, providing 99.982% availability.
- Tier IV: It is the highest standard and comprises multiple active power and cooling distribution paths, has redundant components, and is fault tolerant, providing 99.995% availability.
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