Psu for 80 hdds

[drugno5]

Just as the title says.

If I wanted to power 80 2.5" hdds, from a single psu, what choices do I have?

 

[ar2uro]

the general rule of thumb is ~25w per 7200rpm hdd, so that's about 2000w. Just google that?

 

[Gam3r01]

AFAIK you cant given a single standard PSU, you dont have necessary SATA ports.

 

[drugno5]

From this:
http://www.seagate.com/www-content/support-content/samsung/internal-products/spinpoint-m-series/en-us/samsung-m9t-internal-ds.pdf
I get amperes will peak at ~80 if ever, all 80 hdds spin up at once.

If I use the 1200W version of this:
http://www.seasonicusa.com/Platinum_Series_XP3.htm
which is rated for ~100A on its 12V rail, can I use splitters to power all 80 hdd drives?

Does anyone see anything wrong with this solution?

edit: typo

 

[ar2uro]

Thorerically, what you're saying would work... Don't really see anything to say it won't, so go for it?

 

[turkey3_scratch]

That would require like, a PSU with a really good 5V rail. An old PSU perhaps. That many drives would exceed the capabilities of almost any PSU I can think of.

You can't even connect 80 HDDs to a motherboard. It's just not right, you need to have separate computers, multiple machines with network storages, maybe 10 HDDs each computer.

The other rails in a PSU are important in this situation. I'm not exactly sure of the distribution of 5V and 12V load in a hard drive, but I think any PSU will be insufficient probably.

 

[drugno5]

It seems I got something wrong in my previous post.
All 80 hdds will spin at once every time during boot.

That said:

That would require like, a PSU with a really good 5V rail. An old PSU perhaps. That many drives would exceed the capabilities of almost any PSU I can think of.

You can't even connect 80 HDDs to a motherboard. It's just not right, you need to have separate computers, multiple machines with network storages, maybe 10 HDDs each computer.

The other rails in a PSU are important in this situation. I'm not exactly sure of the distribution of 5V and 12V load in a hard drive, but I think any PSU will be insufficient probably.

You don't plug 80 hdds on the motherboard, you plug them on two 32 port hbas and a 16 port hba.
But that's besides the point.

You say almost any PSU you can think of.
So there are a few you can think of?
Do you have any suggestions?

 

[turkey3_scratch]

It depends on how much 5V and 3.3V each hard drive uses.

 

[drugno5]

If you use this:
http://www.hgst.com/products/hard-drives/travelstar-z5k500
as a base to draw your numbers from,
can you come up with any suggestions?

 

[turkey3_scratch]

On startup each hard drive adds up about 4.5W from the 5V rail, but on average while in normal use that is 1.6W. So with 80 hard drives, if you take into account the higher wattage on startup, you'll want a power supply unit with a whopping 72A capability on the 5V rail! It's just not going to happen. PSUs these days are rated for maybe 25A. You'll have to do some searching.

 

[MeepsterNotchy]

You trolling bro?

 

[drugno5]

On startup each hard drive adds up about 4.5W from the 5V rail, but on average while in normal use that is 1.6W. So with 80 hard drives, if you take into account the higher wattage on startup, you'll want a power supply unit with a whopping 72A capability on the 5V rail! It's just not going to happen. PSUs these days are rated for maybe 25A. You'll have to do some searching.

I was really hoping that my request wouldn't be on the impossible side of the spectrum.
So a single PSU, rated for 25A on 5V rail, can safely power up at startup about 22 2.5" hdds, considering that other components will be using the 5V rail too. Correct?

Is there some kind of supplementary PSU that I can use for that purpose? I did some searching and all I could find was this kind of thing:
http://support.thermaltakeusa.com/Product.aspx?C=1432&ID=1543
Which is specifically designed to supply power to multigpu setups.

 

[drugno5]

Considering that doing this with a single PSU is not possible, I came up with a different solution.

If I use two of these:
http://www.bhphotovideo.com/c/product/846582-REG/Dynapower_USA_zstc1000pc01_Netstor_Single_Server_Grade_1000.html
and one of these:
http://www.amazon.com/Add2PSU-Multiple-Power-Supply-Adapter/dp/B009P98Q8U

I can get a combined power of 70A off the 5V rails.

Reserving 2A for motherboard and basic components to power, it leaves me with 68A to power hdds.
If the 2.5" hdds that I use, require 0.9A off the 5V rail to spin up, like in the example above, then I can power 75 of them.