[AusNOG] CNET: Google uncloaks once-secret server

[Sean K. Finn]

I speculate that:

The Black, white, Red, Yellow and Green wire coming from the PSU looks like a smart-connection that could likely turn the PSU on/off and provide fan readouts and other power metrics.

The Power for the drives is likely being picked up from the Mobo underneath the drives, possible through a PCI-X slot underneath the front drive, or perhaps twin modular connectors on the motherboard (I've seen this before).

The sata power looks like a 2-way power-splitter from Modular to Sata power, so possible there is different cabling underneath where it's bleeding both 12v and 5v from the motherboard.

-Sean.



-----Original Message-----
From: ausnog-bounces at lists.ausnog.net [mailto:ausnog-bounces at lists.ausnog.net] On Behalf Of Kieran Wallace
Sent: Friday, 3 April 2009 1:18 PM
To: AusNOG at lists.ausnog.net
Subject: Re: [AusNOG] CNET: Google uncloaks once-secret server

It looks to me like those wires are of a much thinner gauge than those which
are plugged into the hard drives.

Also, from the article:
> Google's designs supply only 12-volt power, with the necessary conversions
taking place on the motherboard.

I'd say the motherboard does the conversion...

-----Original Message-----
From: ausnog-bounces at lists.ausnog.net
[mailto:ausnog-bounces at lists.ausnog.net] On Behalf Of Colwell, Scott
Sent: Friday, 3 April 2009 10:41 AM
To: AusNOG at lists.ausnog.net
Subject: Re: [AusNOG] CNET: Google uncloaks once-secret server

 

> -----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
.. 
> 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. 

You can see the standard 4 wire power (+5, +12 and 2x GND) going from
power supply to the drive
so it seems likely that there is a 12v to 5v dc/dc converter in the
power supply.

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