Let’s really shoot ourselves in the foot.

There was a discussion at work the other week about system availability measurements.  We’re aiming for “Five Nines”.  Noble target, doubt we’ll achieve it though, without some clever availability exclusions.  I’ve mentioned those exclusions before.

Availability %

Downtime per week Downtime per month* Downtime per year

90%

16.8 hours 72 hours 36.5 [...]