Uptime Tier III concurrent maintainability; Tier IV fault tolerance and continuous cooling under the standard’s defined conditions
III: concurrent maintainability / IV: fault tolerance + continuous coolingobserved
| Value kind | observed — Reported measurements, counts, and specifications keep the precision and scope stated by their source; an exact specification is not treated as a range. |
|---|---|
| Scope | Scheme outcomes within the assessed scope; not a component count, availability percentage, or universal project-cost multiplier. |
| Caveat | The retired availability table is not part of Uptime's Tier Standard. |
| As of | 2026 |
| Source | Uptime Institute, undated Tier Classification System, Tier III and Tier IV sections. No publication day is asserted. Tier IV includes continuous cooling. · Data Center Tier Levels: Tier III and Tier IV |
| Review | checking…review by 2027-03-05 · standard cadence |
| Recorded changes | last 2026-09-16 · 2 revisions tracked |
| Claim id | uptime-concurrent-maintainability-vs-fault |
Where the guide uses it
← Full numbers register — every date-stamped figure in the guide, with revision history.