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Power Supply for 16 HDD's.

post #1 of 9
9/4/12 at 12:35am
Thread Starter 
So I am making a 16 Drive NAS array I am wondering what PSU's would be able to take all of those HDD's.
If I have 16, 10 Watt HDD's that is 160W's coming of one rail.
So what is a PSU that would e able to take it?
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MBA
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A Better Name Then "My System"
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i5 2467m MacBook Air Intel HD3000 128G SSD 
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post #2 of 9
9/4/12 at 12:44am
A PSU with strong minor rails, where are you buying from? (link the shops)
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post #3 of 9
9/4/12 at 1:13am
Thread Starter 
Quote:
Originally Posted by Original Sin View Post

A PSU with strong minor rails, where are you buying from? (link the shops)
http://www.computerlounge.co.nz/components/componentlist.asp?parttypeid=0&t=16 This is where I will be buying it.
I will be putting an eight-core Xeon in so I will need a fairly decent amount of power.
MBA
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A Better Name Then "My System"
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Kingston HyperX T1 (2x4) WD Caviar Black 500GB WD Caviar Green 1TB Seagate Momentus (Soopa Fast 5400RPM!!!) 
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MBA
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A Better Name Then "My System"
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Kingston HyperX T1 (2x4) WD Caviar Black 500GB WD Caviar Green 1TB Seagate Momentus (Soopa Fast 5400RPM!!!) 
Hard DriveOptical DriveCoolingOS
Samsung 1TB (It's really fat) LG GH24NS70 Cooler Master Hyper 412 Ubuntu 12.10 
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WIndows 7 Home Premium VM Dell 22" 16:10  Cooler Master Storm Trigger (Blues) Seasonic SI2II 620W 
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post #4 of 9
9/4/12 at 1:23am
Thread Starter 
So would 24 Amps on the 3.3 rail be enough or do they run of the 5V rail and if so would 25 Amps be enough?
MBA
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A Better Name Then "My System"
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Kingston HyperX T1 (2x4) WD Caviar Black 500GB WD Caviar Green 1TB Seagate Momentus (Soopa Fast 5400RPM!!!) 
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Samsung 1TB (It's really fat) LG GH24NS70 Cooler Master Hyper 412 Ubuntu 12.10 
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MBA
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A Better Name Then "My System"
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Kingston HyperX T1 (2x4) WD Caviar Black 500GB WD Caviar Green 1TB Seagate Momentus (Soopa Fast 5400RPM!!!) 
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Samsung 1TB (It's really fat) LG GH24NS70 Cooler Master Hyper 412 Ubuntu 12.10 
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post #5 of 9
9/4/12 at 3:48am
Quote:
Originally Posted by QuietlyLinux View Post

So would 24 Amps on the 3.3 rail be enough or do they run of the 5V rail and if so would 25 Amps be enough?
They need 5v (for the electronics, the moving parts use 12v).

Not much on offer there, prices are pretty absurd as well..... if you can't buy from somewhere else I'd suggest you pick up a Seasonic X560.
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post #6 of 9
9/4/12 at 10:23am
Also if you can, enable staggered spin-up on your RAID controller. This will reduce the stress of the transient load on the power supply.
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post #7 of 9
9/4/12 at 6:36pm
Thread Starter 
Quote:
Originally Posted by Phaedrus2129 View Post

Also if you can, enable staggered spin-up on your RAID controller. This will reduce the stress of the transient load on the power supply.
I standard HDD uses about 10W if I had 16 of them that is 160W's, does that seems about right.
MBA
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A Better Name Then "My System"
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i5 2467m MacBook Air Intel HD3000 128G SSD 
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FX-6100@5.01Ghz M5A97 EVO ASUS HD5850-DC-1GD5 Kingston HyperX (2x2) 
RAMHard DriveHard DriveHard Drive
Kingston HyperX T1 (2x4) WD Caviar Black 500GB WD Caviar Green 1TB Seagate Momentus (Soopa Fast 5400RPM!!!) 
Hard DriveOptical DriveCoolingOS
Samsung 1TB (It's really fat) LG GH24NS70 Cooler Master Hyper 412 Ubuntu 12.10 
OSMonitorKeyboardPower
WIndows 7 Home Premium VM Dell 22" 16:10  Cooler Master Storm Trigger (Blues) Seasonic SI2II 620W 
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MBA
(7 items)
 
A Better Name Then "My System"
(20 items)
  		 
CPUMotherboardGraphicsHard Drive
i5 2467m MacBook Air Intel HD3000 128G SSD 
Optical DriveCoolingOS
None 120nm apple fan OSX Lion 
View all
CPUMotherboardGraphicsRAM
FX-6100@5.01Ghz M5A97 EVO ASUS HD5850-DC-1GD5 Kingston HyperX (2x2) 
RAMHard DriveHard DriveHard Drive
Kingston HyperX T1 (2x4) WD Caviar Black 500GB WD Caviar Green 1TB Seagate Momentus (Soopa Fast 5400RPM!!!) 
Hard DriveOptical DriveCoolingOS
Samsung 1TB (It's really fat) LG GH24NS70 Cooler Master Hyper 412 Ubuntu 12.10 
OSMonitorKeyboardPower
WIndows 7 Home Premium VM Dell 22" 16:10  Cooler Master Storm Trigger (Blues) Seasonic SI2II 620W 
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CoolerMaster Scout II Logitech G400 Asus Xonar DG Sennheiser HD439's 
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post #8 of 9
9/4/12 at 7:28pm
Quote:
Originally Posted by QuietlyLinux View Post

I standard HDD uses about 10W if I had 16 of them that is 160W's, does that seems about right.

On spin-up it could be 20-30W each. 10W is a little high for most modern drives in normal operation—that's above average for a 7200rpm drive when working hard. It really depends on the drives though.
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post #9 of 9
9/4/12 at 7:59pm
Yeah, on spin-up the hard drive motors can pull up to 1A@12V each for a fraction of the second. This makes a big transient spike in power consumption. Big spikes in power like that cause the power supply's voltage to drop sharply, then recover. Certain power supply topologies, like double forward, have very good transient response and recover very quickly. Other technologies, like LLC resonant half bridge have poor transient response. Unfortunately all of today's highest efficiency power supplies use LLC resonant topologies (with few exceptions). This is good for efficiency, not good for transient response.

Now, poor transient response isn't a *huge* deal, but it can have an effect if you're trying to overclock. The transient load at startup can affect the voltage to your CPU, and could cause it to crash unless you give more voltage, heating up the chip and reducing its lifespan.

So you minimize the transient load by using "staggered spin-up", an option found on many RAID cards that allows you to start the hard drives one at a time so that instead of have 16A thrown at it instantaneously it sees several smaller 1-2A spikes that don't have nearly as much effect. This way you don't need to worry about the transient response of your power supply as much and can simply buy one with good efficiency and other electrical performance metrics such as voltage regulation and ripple suppression.
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