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It all depends…

June 16, 2007

Omar Shahine wrote a great article entitled Designing for Services Dependencies.  If you’re involved in IT at all this is a must read, no matter whether you’re a developer or on the operations side.

If only more developers would understand the dependencies they add into their systems!

Here’s a quick chart that talks about “The Nines”.  You’ll hear people talking about wanting to have “five nines” of availability.  Good luck with that!  🙂

Reliability Downtime / year
99.999% 5 min
99.99% 53 min
99.9% 9 hours
99.8% 18 hours
Categories: IT, technology
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