Difference between revisions of "System availability"
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|width="100px"|'''Availability''' | |width="100px"|'''Availability''' | ||
|width="100px"|'''Nines''' | |width="100px"|'''Nines''' | ||
| − | |colspan="2" width=" | + | |colspan="2" width="200px"|'''Downtime''' |
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|90%||1||36.5||days/year | |90%||1||36.5||days/year | ||
Revision as of 13:50, 4 August 2009
System availability
System Availability
- The percentage of time that the system can perform its intended function
System Availability = 1 – System Downtime
Downtime per year
| Availability | Nines | Downtime | |
| 90% | 1 | 36.5 | days/year |
| 99% | 2 | 3.65 | DAys/year |
| 99.9% | 3 | 8.78 | hours/year |
| 99.99% | 4 | 52 | minutes/year |
| 99.999% | 5 | 5 | minutes/year |