Uptime Glossary

Browse 3 uptime terms defined in plain English, from the cultural dictionary of computing.

3 Uptime Terms

Availability: The property that systems, data, and services remain accessible and usable when needed by authorized users. In security, availability is one of the core goals...
Five Nines: A measure of system availability equal to 99.999%, allowing no more than 5 minutes and 15 seconds of downtime per year.
Nines: Shorthand for uptime percentages. 'Three nines' = 99.9%, 'five nines' = 99.999%. Each additional nine is exponentially harder and more expensive to achieve....