Availability Variables
The primary variables to help you determine what high availability path you should be going down are
Uptime requirement— The goal (from 0% to 100%) of what you require from your application for its planned hours of operation. I would imagine this to be above 95% for a typical highly available application.
Time to recover— A general indication (from long to short) of the amount of time that can be expended to recover an application and put it back online. This could be in minutes, hours, or just in terms of long, medium, or short amount of time to recover. The more precise the better, though. As an example, a typical time to recover for an OLTP (Online Transaction Processing) application might be 5 minutes. This is fairly ...
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