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Power supply for a file server? - Page 3

post #21 of 62
Thread Starter 
Quote:
Originally Posted by u3b3rg33k View Post
Think about that for a moment.



here's a 3ware 12 port card. No heatsinks, no fans, no pci-e or "molex" connections. Most of these cards will only use a few watts worst case, and that would be if you were doing something like rebuilding a degraded SSD based raid 5 array.
Sorry for the confusion. I meant a 12-port card would cost more DOLLARS than the DOLLAR cost of purchasing a stronger PSU over a weaker one.
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post #22 of 62
Thread Starter 
Finally found my Kill-A-Watt. Uses 326W with drives idle (spinning, not doing any reading or writing) after the UPS. Though I ensured the system was the only thing plugged into the UPS (disconnected the monitor) and that the UPS was not charging or discharging.

Edit: Uses 354 with all drives doing linear reads.

Edit 2: Uses 195 with as many drives spun down as possible. Only the two drives are still spinning.
Edited by Birthday Attack - 5/17/11 at 9:17am
Cherry
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Cherry
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post #23 of 62
the price difference between a 450-650W unit is going to be nearly negligible. Just pick up a 500-600W unit from here and on you go.
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post #24 of 62
Quote:
Originally Posted by birthday attack View Post
sorry for the confusion. I meant a 12-port card would cost more dollars than the dollar cost of purchasing a stronger psu over a weaker one.
10-4.
 
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post #25 of 62
Thread Starter 
Seems like most of the PSUs on the FAQ list have 25A 5V rails or less... the first one with a bigger (30A) rail is the corsair 650TX original version (but not the V2.) As far as I can see anyway!
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Cherry
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post #26 of 62
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post #27 of 62
Hard drives draw little power these days. My atom based (that's being replaced soon), runs 60 watts idle with 8 hard drives. My next build might have as many as 20 5400krpms and an e-350 but I'm still just going to use my 550w corsair.
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post #28 of 62
Thread Starter 
Okay I did some science!

I hooked up my multimeter to the 5V line on a 750GB Seagate 7200.11 SATA drive I had laying about. This was via a Molex/SATA adapter so there was no 3.3V supplied to the drive. It consumed up to .75A (3.75W) (when writing) and .50A when idling. That means 12 of these could take 9A (45W)... and they'd all have to be writing at once. That's well below the 25A available most PSUs I looked at from the FAQ list. I don't think I need to worry about that then.
Edited by Birthday Attack - 5/17/11 at 11:37am
Cherry
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Many and Varied Debian GNU/Linux "Squeeze" Dell 2408WFP DasKeyboard Ultimate Silent 
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Cherry
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CPUMotherboardGraphicsRAM
1100T@3.8x6 NB@3.0 GA-MA790GP-DS4H Integrated 790GX (HD3300) 8GB G.Skill DDR2 @856 4-4-4-12 
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Many and Varied Debian GNU/Linux "Squeeze" Dell 2408WFP DasKeyboard Ultimate Silent 
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Corsair AX850 Cooler Master 690 Original Trackman Wheel 
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post #29 of 62
Indeed, look at the 5V / 12V draw of power drives here:

http://www.xbitlabs.com/articles/sto..._15.html#sect0
post #30 of 62
Quote:
Originally Posted by Birthday Attack View Post
Finally found my Kill-A-Watt. Uses 326W with drives idle (spinning, not doing any reading or writing) after the UPS. Though I ensured the system was the only thing plugged into the UPS (disconnected the monitor) and that the UPS was not charging or discharging. Edit: Uses 354 with all drives doing linear reads. Edit 2: Uses 195 with as many drives spun down as possible. Only the two drives are still spinning.
what's the size of your ups?
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