High availability isn't about nines: it's resilience by design
Franc0Fernand0 · x · 2026-10-08
- The author argues a system that never failed isn't necessarily highly available: availability measures resistance to failures, not historical uptime.
- Nines quantified: 99% = 3.65 days of downtime per year, 99.9% = 8.76 hours, 99.99% = 52.6 minutes.
- A single-server web app that has always worked isn't highly available; high uptime is a by-product of how systems are designed, implemented, and maintained.
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