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
Nathan's Occasional Blog 