![](../../_themes/blueprnt/blubul1a.gif) | Measurement interval is a key to extended outages
![](../../_themes/blueprnt/blubul2a.gif) | Assume 99.5% availability
![](../../_themes/blueprnt/blubul3a.gif) | If one month, allows a failure within the month of > 3.5 hours
![](../../_themes/blueprnt/blubul3a.gif) | If one day, less than 8 minutes per day
| | ![](../../_themes/blueprnt/blubul2a.gif) | Go for the nines!
![](../../_themes/blueprnt/blubul3a.gif) | 99.95% allows 22 minutes per month outage
![](../../_themes/blueprnt/blubul3a.gif) | 99.995 allows about 2 minutes per month
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