[AusNOG] CNET: Google uncloaks once-secret server

[Sean K. Finn]

1.3 Amp Hour 12 Volt Sealed Lead Acid Battery:
 http://www.jaycar.com.au/productView.asp?ID=SB2480
20 Bucks.

Look on the worlds faces when they see how you use them in your servers:
:o
Priceless.

>> So your Googlish data centre isn't too far away :-)

>From what I've seen, there are flavours of DC cropping up that are very close to the big G's already.

-S

--------

I'm surprised someone else hasn't posted this link already.  It's a few years old.  It was written by Google people and explains exactly what they're up to with their power supply with photos of the PSU module.  They don't talk about the battery.

http://209.85.203.104/external_content/services.google.com/blog_resources/PSU_white_paper.pdf

One of my coworkers pointed me towards PicoPSU-120 which is a 12 volt ATX power supply built into an ATX connector.  There are various flavours that operate at various voltages.  You would need one of the "wide input" versions if you wanted to use a 13.8 volt battery.

You can buy 13.8 volt supplies off the shelf at places like Dick Smith and Jaycar.  So your Googlish data centre isn't too far away :-)

Cheers,

jsl

On 03/04/2009, at 1:05 PM, Kaan Kivilcim wrote:


"Another illustration of Google's obsession with efficiency comes through power supply design. Power supplies convert conventional AC (alternating current--what you get from a wall socket) electricity into the DC (direct current--what you get from a battery) electricity, and typical power supplies provide computers with both 5-volt and 12-volt DC power. Google's designs supply only 12-volt power, with the necessary conversions taking place on the motherboard."

Gigabyte must be making a custom design for Google I'd imagine.

kk

-----Original Message-----
From: ausnog-bounces at lists.ausnog.net [mailto:ausnog-bounces at lists.ausnog.net] On Behalf Of Bob Purdon
Sent: Friday, 3 April 2009 1:23 PM
To: Craig Askings; AusNOG at lists.ausnog.net
Subject: Re: [AusNOG] CNET: Google uncloaks once-secret server


Battery goes directly into the PSU, so presumably there's a charging
circuit in there.  I'd expect this to work a lot like a 48VDC system,
except at 12V.

The only thing that isn't explained - at least for me - is where they're
getting the 5V for the HDD's from (assuming the Hitachi Deskstar's
actually require 5V).  They may have a small DC/DC converter under the
HDD's for that though. 
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