05. Uptime

Uptime is a measure of how much time an application or service is available and running normally. Uptime is often measured as a percentage, usually in the "number of 9s" vernacular. For example, "4 9s" refers to a service being available for 99.99% of a time period.

Services that offer Service Level Agreements (SLAs) typically start at 99% and get more stringent from there. 99.9% is a common SLA. The more "9s" an SLA offers, the more difficult and costly it is to achieve. You must ask yourself how much effort you are willing to put in and how much your company is willing to pay before proceeding into the territory of 4 9s or beyond.

Chart of "number of nines"