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PSU for Server

post #1 of 8
Thread Starter 
Hey all,

I'm planning out my build for my home file server and I'm a bit lost over how to select a PSU for it. Mostly, how much power of what kind of voltage does a hard drive draw? Initially I plan on having 6 hard drives and 1 DVD drive, though I would like the potential to upgrade it to 11/16 total hard drives.

What kind of PSU can handle 16 hard drives? (They do exist right? ) Does choosing a PSU for a hard drive heavy system differ from an optimal graphics card solution?

Appreciate any PSU recommendations, but especially what specs I should look for in selecting a PSU for a server.
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post #2 of 8
most hard drives take 1-2 amps on the 5volt rail (usually 1.5ish)
and 1-2amps on the 12volt (usually 1.5ish)

(usually twords the lower end of the scale)

So you will need at least 32amps on the 5volt rail and 32amps on the 12volt rail, just to be safe and be able to upgrade to 16

+for all you different parts eg CPU....

As far as that masny connectors there are PSU's that are made for servers however if your using a normal one (non server) psu A bunch of molex 1 to 2 extenders should do fine .

Most servers with that many drives have 2 or (sometimes 3) PSU's

Hope this helps and good luck
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post #3 of 8
Unearthly, aside from 16 HDD's could you please let us know the other components that will make up this server? It will allow us to make better recommendations for PSU's. Right now I'm tempted to recommend something along the lines of my own PSU, given the fact that I don't know if you intend to use it with a quad core and dual graphics card setup or not.

Quote:
Originally Posted by iampoor
most hard drives take 1-2 amps on the 5volt rail (usually 1.5ish)
and 1-2amps on the 12volt (usually 1.5ish)
HDD's operate exclusively from the 12v+, not the 5v+.

Quote:
Originally Posted by iampoor
and 32amps on the 12volt rail, just to be safe and be able to upgrade to 16
That seems correct enough to me.

Quote:
Originally Posted by iampoor
As far as that masny connectors there are PSU's that are made for servers however if your using a normal one (non server) psu A bunch of molex 1 to 2 extenders should do fine .
Correct.

Quote:
Originally Posted by iampoor
Most servers with that many drives have 2 or (sometimes 3) PSU's
Multiple PSU's are not necessary on a small file server of only 16 HDD's.
post #4 of 8
Thread Starter 
Quote:
Originally Posted by t4ct1c47 View Post
Unearthly, aside from 16 HDD's could you please let us know the other components that will make up this server? It will allow us to make better recommendations for PSU's. Right now I'm tempted to recommend something along the lines of my own PSU, given the fact that I don't know if you intend to use it with a quad core and dual graphics card setup or not.
It's just a file server, no quad core here.

CPU: Celeron D 2.6 Ghz
RAM: Some value 512mb DDR2
Mobo: Gigabyte 965G (If you're wondering, I'm trying to find an excuse to get rid of it after I realized it stinks for OCing)
GPU: Integrated

PCI-X: 2x SATA II Controller Card


Quote:
Originally Posted by t4ct1c47 View Post
HDD's operate exclusively from the 12v+, not the 5v+.
That's good, I was looking for PSU's with +5V@32A and they aren't aplenty.
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post #5 of 8
Quote:
Originally Posted by t4ct1c47
Originally Posted by t4ct1c47
HDD's operate exclusively from the 12v+, not the 5v+.
Sorry, it seems that this statement isn't entirely correct, though they primarily draw power from the 12v+ for the mechanical components of the HDD, the 5v+ is used to supply some power to the cache and controllers built into the HDD.

With this in mind, and the fact that you want to use many HDD's, I feel that you should be looking into PSU's such as the Enermax Galaxy series or the Tagan TG-900/TG-1000 U96. Both are pretty expensive, though at least you only need to use one PSU.

I don't know if you've already thought of it, but cooling will also be an issue with so many drives in one system. You should think very carefully about what chassis you will house your system in and make sure that you have an appropriate amount of fans that will keep the HDD's cool. Also bear in mind that the type of HDD's you use will also have an effect on power and heat. SATA HDD's tend to require more power, and thus produce more heat, than ATA and SCSI drives.
post #6 of 8
If you have spare PSU's you can conjoin them to run your home server , it will balance the load and be cheaper then buying a server grade psu.
SpookedJunglist's FAQ
also
http://www.directron.com/2powersupplies.html
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post #7 of 8
Thread Starter 
Quote:
Originally Posted by t4ct1c47 View Post
Sorry, it seems that this statement isn't entirely correct, though they primarily draw power from the 12v+ for the mechanical components of the HDD, the 5v+ is used to supply some power to the cache and controllers built into the HDD.
Well, I don't need +5V@32A though, right? As I said, not many PSUs have that much.

Quote:
Originally Posted by t4ct1c47 View Post
With this in mind, and the fact that you want to use many HDD's, I feel that you should be looking into PSU's such as the Enermax Galaxy series or the Tagan TG-900/TG-1000 U96. Both are pretty expensive, though at least you only need to use one PSU.
Are those really needed? That Tagan has 6 12v Rails! I thought I only needed ~+12V@32A? That's why instead I was looking at something more like the Enermax Liberty, which has +5V@30A, 2x +12V@22A, and 80+ Certified, and $150 less than the Galaxy.

Quote:
Originally Posted by t4ct1c47 View Post
I don't know if you've already thought of it, but cooling will also be an issue with so many drives in one system. You should think very carefully about what chassis you will house your system in and make sure that you have an appropriate amount of fans that will keep the HDD's cool. Also bear in mind that the type of HDD's you use will also have an effect on power and heat. SATA HDD's tend to require more power, and thus produce more heat, than ATA and SCSI drives.
I have realized that cooling will be an issue. Right now I'm planning on getting the Lian Li PC-V2000Bplus II. Looking at it's layout, I was thinking of installing some extra fans (maybe pair of 120mm?) on the right side of the HDD cage and replacing the front fan with a pair of fans as well, assuming it fits. The 5.25 bays (converted to 3.5) should be easy to fit extra fans behind them and if necessary, in front of them. (It's a server, it doesn't need to look pretty. )

Quote:
Originally Posted by DiagnosisDirt View Post
If you have spare PSU's you can conjoin them to run your home server , it will balance the load and be cheaper then buying a server grade psu.
SpookedJunglist's FAQ
also
http://www.directron.com/2powersupplies.html
I don't have any spare PSUs, so I'd have to buy new one(s) regardless. That said, EE isn't my specialty so I'd prefer to buy a single unit for convenience.
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post #8 of 8
You only need about 26A depending on your motherboard... if your motherboard has a seperate power connector (ATX12V) for your CPU, you will need about 22A on the 5V line, and ~30A on your 12V line. For motherboards NOT having the ATX12V plug, it becomes about 26A/5V and 25A/12V
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