Ha Avalability Table
Availability Table - Cheat sheet
Availability level | Downtime per year | Downtime per quarter | Downtime per month | Downtime per week | Downtime per day | Downtime per hour |
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90% (“one nine”) | 36.5 days | 9 days | 3 days | 16.8 hours | 2.4 hours | 6 minutes |
95% | 18.25 days | 4.5 days | 1.5 days | 8.4 hours | 1.2 hours | 3 minutes |
99% (“two-nines”) | 3.65 days | 21.6 hours | 7.2 hours | 1.68 hours | 14.4 minutes | 36 seconds |
99.50% | 1.83 days | 10.8 hours | 3.6 hours | 50.4 minutes | 7.20 minutes | 18 seconds |
99.9%(“three nines”) | 8.76 hours | 2.16 hours | 43.2 minutes | 10.1 minutes | 1.44 minutes | 3.6 seconds |
99.95% | 4.38 hours | 1.08 hours | 21.6 minutes | 5.04 minutes | 43.2 seconds | 1.8 seconds |
99.99%(“four nines”) | 52.6 minutes | 12.96 minutes | 4.32 minutes | 60.5 seconds | 8.64 seconds | 0.36 seconds |
99.999%(“five nines”) | 5.26 minutes | 1.30 minutes | 25.9 seconds | 6.05 seconds | 0.87 seconds | 0.04 seconds |