If you’re anything like me then you look at an uptime figure of 99% and automatically assume “that’s good” – but have you ever sat down and worked out exactly what that equates to in time?

I know I haven’t, but Pingdom have come to my/our rescue with their handy Uptime / Downtime Conversion cheat sheet.

One can see at a  glance the difference between 99% and 99.9% uptime per month and per year. If you’re running a service that needs to remain up 24*7 then per month then it’s a difference of 6hrs 29m which increases to 3d 6hr 50m per year – suddenly 99% doesn’t look that good.

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