Capacity planning

Capacity planning looks like black magic sometimes. A CTO or CFO decided what technique or cost without deep understanding of rapid changes of software and hardware today.

So, how to attack it?

• Don't be afraid, you cannot be friend with everyone
• No matter how much you know, you are wrong too
• Use facts first, second guts feeling (even you can be right)
• Reserve your result with +-20%
• Have a plan B. It is your insurance!
• Discuss your idea with other seniors people, they will always agree and disagree
• Be brave, if you want to consider everything, you won't progress at all!
• Don't believe what vendor tells you, nor Internet. 
• Last and most important: understand the complexity first. 
• Every change that involve human will be immortally hard to defeat