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On Thu, Oct 13, 2011 at 8:46 PM, Edward Ned Harvey <blu at nedharvey.com>wrote: > > From: discuss-bounces+blu=nedharvey.com at blu.org [mailto:discuss- > > bounces+blu=nedharvey.com at blu.org] On Behalf Of Matt Shields > > > > A long time ago I got fed up with trying to calculate amperage, so I > > invested in a clamp on ammeter. Then I test my servers when I get them > and > > record the high and average usage. > > This is an excellent practice. I have been using kill-a-watt, but the > clamp > is more convenient. Besides knowing the A, you also want to know the VA > and > W so you can spec your UPS appropriately. > > One thing to be keenly aware of is that power draw of a server is variable. > To reach max power, you need to find ways of stressing the high power > components - Usually the CPU and GPU (if any.) But a "while 1 { ; }" loop > will not stress much of the cpu, so it doesn't do a good job of reaching > max > power. The best stuff will be things like the AES instruction set, and > generating random numbers and doing parallel compression. Get the max > power > of the system and fluff it a bit. > > I also have a killawatt but the problem comes when I have to work on someone else's live equipment. The clampon ammeter means I don't have to shut the server's off. I can also clamp on to the rack's main power feed if I don't have a APC PDU. Well worth the money I spent. Matthew Shields Owner BeanTown Host - Web Hosting, Domain Names, Dedicated Servers, Colocation, Managed Services www.beantownhost.com www.sysadminvalley.com www.jeeprally.com Like us on Facebook <http://www.facebook.com/beantownhost> Follow us on Twitter <https://twitter.com/#!/beantownhost>
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