[AusNOG] Power audit

[Pinkerton, Eric]

Forgive my naivety, but I have always assumed that power consumption changed depending upon the load the server is under?  - If this is the case then isn't there a problem with a single measurement at one point in time?


-----Original Message-----
From: AusNOG [mailto:ausnog-bounces at lists.ausnog.net] On Behalf Of Damien Gardner Jnr
Sent: Wednesday, 5 June 2013 7:13 PM
To: Ross Wheeler
Cc: ausnog at ausnog.net
Subject: Re: [AusNOG] Power audit

Yeah, that's how I do it..  30cm long IEC-IEC cable with a section of outer removed, clamp meter around the active, unplug one side supply, plug cable inline with it, and plug back into server.  Take reading, remove from line and plug original cable directly back in.  Repeat for 
second PSU.   Repeat for every server.

Last time I ran it was just after we'd moved into one particular suite, where we were being told the gear in our new rack was pulling 4kW.  Was news to me, as while running the whole lot up in the lab, it'd been on a single 3kVA UPS, at about 2/3 load.. Sure enough, after measuring everything manually, it measured out at 1.9KW.  Sent a please explain to the provider, never heard back, notice their portal is still showing close to 4KW for our rack, but haven't had a 'you are using way too much' email from them again..  Guess it's good money, overcharging all their clients by 100% for power usage, they'd rather just sweep it under the carpet..? ;)

--DG

On 5/06/2013 3:31 PM, Ross Wheeler wrote:
>
>
>> On that basis, I'm tossing overboard as much kit as I can jettison 
>> and looking for like-minded sub-let tenant prospects who need a few 
>> RU for switches and could use our interconnects to a number of 
>> carriers. They will get a PDU as recommended but I'm sticking with my 
>> monthly manual email request for usage reporting until I muster the 
>> courage for downtime.
>
> One thing I didn't see mentioned - how much of your kit has dual 
> supplies?
> Simple matter to unplug just one power source and connect to 
> power-monitoring device, then once that supply is back online, do the 
> other lead?
>
> Just a thought...
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--
Damien Gardner Jnr
VK2TDG/VK2DGJ. Dip EE. GradIEAust
rendrag at rendrag.net -  http://www.rendrag.net/
--
We rode on the winds of the rising storm,
  We ran to the sounds of thunder.
We danced among the lightning bolts,
  and tore the world asunder

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