We often see claims that such and such an application has \(99.\cdots\) reliability. That seems pretty definitive but what does it really mean? Here’s the answer. The difference between 99.9% and 99.99% is significant. By the time we get to 99.99999%, we’re essentially at zero downtime.
We see these types of numbers all the time but it’s nice to see what they really mean in terms of downtime.