What is availabilty?
Availabilty of an application refers to the percentage of the time application provides operations expected from it, and is accessible to all the users.
Measuring Availability
- Availability is measured as percentage of uptime over a given period, usually a month or a year.
- The formulae is typically
Availability = (Total Service Time - Downtime) / (Total Service Time) - The value is expected to be extremely close to
100%i.e.99%+, the higher the better..