Some real good pointers and I am going to check them out....
gjgowey@tmo.blackberry.net wrote:
APC has a selector tools on their website that takes the parameters of your system and tells you what model you need. Not sure how accurate it is, but it's probably fairly close considering how many things you need to enter.
And sometimes it gives you a close number. I have used it in the past.
Actually, in this case I picked up 4 decTOPs. The specs say they pull 8W @ 12vDC. That is with the supplied 10Gb 3.5" hard drive and 128Mb PC2700 SoDIMM memory, and I assume their USB keyboard, mouse, and ethernet.
So I am upping the memory on some to 256Mb, and others to 512Mb (max for the system). I am pulling the 3.5" power-hungry (and heavy) 10Gb drive and either going with a 10-20Gb 2.5" drive (need an adapter for that), or two Compact Flash drives: 4Gb memory drive & 4Gb Hitachi MicroDrive. Add bluetooth, switch to a mini USB keyboard and Bluetooth mouse (would like a bluetooth keyboard, but too pricy).
Now the pwer supply states 40W @ 12vDC. Can I power three of these from the one supply along with a monitor:
http://cgi.ebay.com/6-5-inch-TFT-flat-panel-great-for-Car-or-PC-project_W0QQ...
When I run them as a proof-of-concept demo? How long can I run them on a 3500mAh 12vDC battery unit:
http://cgi.ebay.com/Slim-External-Universal-NiMH-Battery-for-most-Laptops_W0...
Will be an impressive poc if I do it from batteries.
So I want to know what I can expect these systems to eat, electron-wise!
Geoff
Sent from my BlackBerry wireless handheld.
-----Original Message----- From: "Robert Moskowitz" rgm@htt-consult.com
Date: Fri, 3 Aug 2007 16:29:00 To:CentOS mailing list centos@centos.org Subject: Re: [CentOS] Power burn test
Timothy Selivanow wrote:
On Fri, 2007-08-03 at 15:01 -0400, Robert Moskowitz wrote:
I need a program that will just run everything at max so I can measure the max power used on some systems. My 'Kill a Watt' meter should show up early next week.
SO run that CPU at max, using all memory, and keeping the harddrive spinning.
I can jsut do pings on the lan card for it to stay awake.
I have searched here and on the net and have come back with nothing.
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Are you wanting max power for provisioning purposes? If so, the max power on the power supply or chassis will give you absolute max. 80% of that number is what it is rated for on a continuous basis, 100% is for max burst.
No for UPS purposes. Actually some of these are 'portable' and I want to size an external battery.
I will be running a number of tests. Max, min, 'typical'.
If you need a more accurate number (as the above is the rated Wattage, which /will/ be different than actual usage for safety purposes), you could run multiple of something like this: `dd if=/dev/urandom of={somefile} bs=1024k count=1024`. Depending on your processor speed, that won't keep the disks busy all the time which is why I suggested multiple running at the same time. What that will do is pull 1GB worth of random data (stresses CPU) and writes it as fast as possible to the disk. Running a few of those in a loop should give you enough time to see actual power draw. Shifting bits around in the memory register probably won't add too much power draw, as it is mostly CPU and chipset (just CPU if you are using AMD). The RAM stick is fully powered regardless.
Hope that helps at least a little.
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