What does 99.9% uptime mean?

what is 99.9% uptime

When you choose a web host (choose me!), and they tell you that they have 99.9% guaranteed uptime, it sounds like your site is going to be available come hell or high water, right?

Not quite.

If you run a site monitor (and you should – see my post here), you might be aware that 99.9% uptime is actually not quite as reliable as you would imagine.

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