If I were to build a 2.4 core 2 duo w/ 2gb ram and 4 x 500gb sata and 2 x 160 sata, both in raids. Do you guys think that would be above 2 amps usage? I was thinking maybe the efficient cpu would make up for the large amount of hard drives, all though their IO activity won't be that high. Maybe if someone has a similar setup they could shed me some light .
To give you an idea we run Dual Opteron (Dual Core) systems with 6GB RAM, 4 x SCSI Hard Disks and four primary fans and they pull between 2.0 - 2.5 amps depending on the load. You would be best checking with your hardware vendor though for your specific server as they should be able to tell you what the maximum consumption will be.
Another thing you will need to watch out for is to allow a little overhead for booting up as they will suck more power then. You will also not be able to run your circuit over 80% so if you have a 20amp drop then you will have a maximum usage of 16 amps. We generally play it safe and don't use above 70% of the circuit to ensure we aren't going to trip a breaker.
If you get a decent PDU installed in your rack then you will be able to track the power usage for each server and the circuit as a whole remotely via a web based interface. Most of the good APC units support this.
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I currently have a server with 1 opeteron 244 (mobo supports 2cpu), RAID 1 (hardware), 5 fans running at 15krpm on a 400 powersupply unit, and it is using 4amps, so keep in mind all the other components that will make up your server.
I hadn't tested the psu, but I am going to pull that server out of the rack, and deploy a low-power consumption based server that will handle the load.
I ran several load tests on it for hours on end, and the box ran like a champ. I may have to put on my electrical technician cap on and roll up the sleeves to research.
Any ideas on how to test the psu efficiently? Mind you the amperage was tested after the box was on for 10 minutes, or maybe 30 minutes, I forgot which one, but the result was 4 amps. Believe me I am rather suspicious about it, and am considering buying an ampmeter, but wanted to know of ways to test it out without doing so.
I do have a digital multi-meter, maybe I can test out the connectors on it and see what kind of reading I get from it based on the voltage of each pinout?
Well, just look up the model of the PSU and check the manufacturer's published efficiency rates. Good PSU's will do close to 80% efficiency.
Bad/cheap PSU's will do closer to 50%. That itself can make a marked difference.
If you want to know how much amperage your PSU is drawing, your PDU should do that for you
I remember it was a zippy power supply, model P1M-6400P. Well the thing is this is the reading my colo provider gave me based on their reading, which I am assuming and have reason to believe was coming from their pdu.
I will dig into this and see what I can do on my end for future reference, and any findings or musings I'll share here