capacity planning

I am interested in how you make any capacity planning for your infrastructure , what you consider, and how do you present it  to your managers. I want to start making something in this direction and I am wondering  what to say to our managers, and to consider.
dedriAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
arnoldCommented:
You have to assess the current resources being used and how their usage increases and then extrapolate if the current increase usage continues for three/five years, then double the end result. If the rate of resource use grows rapidly, you should triple rather than double.
tfewsterCommented:
I was looking designing for performance/capacity planning a few weeks back, and didn't find any simple answers (either it's a dark art or practitioners don't like to share their methods ;-)

However, I found the following links interesting:
http://www.alexanderpodelko.com/PerfManagement.html
http://searchdatacenter.techtarget.com/tip/Capacity-planning-tools-tutorial-for-Linux-and-Unix
http://www.amazon.co.uk/Performance-Design-Computer-Capacity-Planning/dp/0130906735/ref=sr_1_1?s=books&ie=UTF8&qid=1326821507&sr=1-1
IBM Eserver pSeries Sizing and Capacity Planning: A Practical Guide http://www.redbooks.ibm.com/redbooks/pdfs/sg247071.pdf
Bonnie: Disk speed testing tool http://www.garloff.de/kurt/linux/bonnie/

Good luck, and I'll be watching this thread for any additional info, so sharing anything you find would be appreciated!

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