Each managed service will provide it's customers with a Service Level Agreement (SLA) which stipulates the minimum up-time that their systems will be up and running throughout the year. Up-time reliability is usually expressed as a percentage of up-time; the more 9's the better. As an example, three 9's or 99.9% is less reliable than four 9's at 99.99%.
The number of 9's significantly alter the agreed upon stability of the network.
The number of 9's significantly alter the agreed upon stability of the network.
Unexpected downtime losses vary greatly due to a number of factors unique to each business. The day and time, as well as the impact of the issue itself add more variables to the losses. As downtime increases, potential losses can quickly spiral upwards