Uptime Tier III concurrent-maintainability and Tier IV fault-tolerance outcomes under the standard's defined conditions
Tier III / IV outcomesobserved
| 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 | capacity redundancy, distribution paths, concurrent maintainability, and fault tolerance; no certified availability percentage |
| Caveat | The retired availability table has been removed; Uptime Tier records topology and operational outcomes, not a certified availability percentage. |
| As of | 2025 |
| Source | Uptime public Tier definitions : cumulative Tier III/IV outcomes, maintenance-state qualification and continuous cooling; no availability percentage. |
| Review | checking…review by 2027-09-05 · standard cadence |
| Recorded changes | last 2026-09-16 · 5 revisions tracked |
| Claim id | legacy-tier-iii-tier-iv-availability-1-6-hr-vs |
Where the guide uses it
← Full numbers register — every date-stamped figure in the guide, with revision history.