High Availability
Byadmin on Mar 21, 2008 | In High Availability
The term “high availability” is frequently used when referring to a system that is capable of providing service most of the time. This is typically quantified in terms of the number of “9s”.
Number of 9s Downtime per Year Typical Application 3 Nines (99.9 %) ~ 9 hours Typical Desktop or Server 4 Nines (99.99 %) ~ 1 hour Enterprise Server 5 Nines (99.999 %) ~ 5 minutes Carrier Class Server 6 Nines (99.9999 %) ~ 31 seconds Carrier Switch Equipment
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