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SLA’s (Service-level agreements) quite often contain promises like ‘95% uptime’, ‘99% uptime’ or ‘99.99% Uptime SLA’. But what does this mean in reality?
Here’s a table with the most common values of high availability:
| Availability % | Downtime per year | Downtime per month | Downtime per week |
|---|---|---|---|
| 90% | 36.5 days | 72 hours | 16.8 hours |
| 95% | 18.25 days | 36 hours | 8.4 hours |
| 99% | 3.65 days | 7.20 hours | 1.68 hours |
| 99.5% | 1.83 days | 3.60 hours | 50.4 minutes |
| 99.9% | 8.76 hours | 43.8 minutes | 10.1 minutes |
| 99.95% | 4.38 hours | 21.56 minutes | 5.04 minutes |
| 99.99% | 52.56 minutes | 4.32 minutes | 1.01 minutes |
| 99.999% | 5.26 minutes | 25.9 seconds | 6.05 seconds |
| 99.9999% | 31.5 seconds | 2.59 seconds | 0.605 seconds |
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