Uptime
Uptime is a calculation of the amount of time a device is online, available, and functioning during a given time period. Conversely, downtime is a calculation of the amount of time a server is unavailable during a given time period. Many server operators use third-party uptime monitoring services to improve their uptime performance and to verify targets with their customers.
Calculating downtime
Here's a handy list to gauge how much downtime one may experience over the course of a year, based on a web hosting company's uptime guarantees:
- 99.9%: 8 hours 46 minutes
- 99.5%: 43 hours 50 minutes
- 99.0%: 87 hours 39 minutes
- 98.0%: 175 hours 19 minutes
Uptime reporting
Regular reporting of uptime performance enables stakeholders to determine whether goals and SLAs have been met, as well as enabling decisions to be taken with the aim of improving system reliability.
See also
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