Michael Miller

9) Ignore future capacity impacts and only use highest cost AWS pricing by ignoring reserved instances, spot, real utilisation etc.

8) make assumptions on 95%+ utilisation and compare only flat loads i.e. ignore variation.

7) ignoring staffing costs (you were employing them anyway), ignore opprtunity costs etc and maintenance is another budget.

6) Start claiming AWS is low margin & discount any possibility of future price cuts.

5) Ignore any ecosystem benefits of public cloud, be careful no-one looks at rates of agility / innovation / customer focus.

4) Claim your security is "better" because you own it. Just hope no-one looks.

3) depreciate items over 7 years including software developement etc. Ignore you'll be adding more.

2) discount big ticket items (e.g. data centre) as sunk cost and therefore "free".

Tips for making your private cloud viable. 1) ignore most of the cost and claim it's someone elses budget (e.g. power) ...