Infrastructure Architecture Design Questions
This is very interesting and fairly comprehensive list of basic operational questions to ask when building the infrastructure on your web facing project - from the Microsoft.com operations team.
I love the breakdown of availability, this is something I've had lots of discussions with people in the past - and I've found it a pretty good measure of priorities in the past:
| Availability % | Downtime per year | Downtime per month* | Downtime per week |
| 98% | 7.30 days | 14.4 hours | 3.36 hours |
| 99% | 3.65 days | 7.20 hours | 1.68 hours |
| 99.5% | 1.83 days | 3.60 hours | 50.4 min |
| 99.9% | 8.76 hours | 43.2 min | 10.1 min |
| 99.99% | 52.6 min | 4.32 min | 1.01 min |
| 99.999% | 5.26 min | 25.9 sec | 6.05 sec |
| 99.9999% | 31.5 sec | 2.59 sec | 0.605 sec |
The hardest question for anyone starting a new project is answering performance questions - how to test this without over-engineering and blowing out cost?
- jorke
