[132912] in North American Network Operators' Group
Re: Want to move to all 208V for server racks
daemon@ATHENA.MIT.EDU (Seth Mattinen)
Thu Dec 2 16:57:43 2010
Date: Thu, 02 Dec 2010 13:57:37 -0800
From: Seth Mattinen <sethm@rollernet.us>
To: nanog@nanog.org
In-Reply-To: <AANLkTimbdK6f3FKV_tB9Ng8-vswx-Ct7bDZn33LRow90@mail.gmail.com>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On 12/2/2010 13:42, Darren Bolding wrote:
> One thing to be aware of- if you are going to be connecting gear with bigger
> current draws- Cisco 6509's, most blade enclosures etc. come to mind- then
> many of them effectively require 208V C19 connectors.
Even smaller stuff like a 2U server will have multiple ratings on the
PSU these days: you will only get full capacity out of it at high
voltage. Plus, almost any modern PSU will run at higher efficiency
compared to 120V.
> There are not as many power strips out there that provide sufficient numbers
> of C19 connectors as would be desired, particularly if you want remote
> switched power.
>
> In that case 3 Phase power becomes more attractive. Since many datacenters
> are moving towards consolidation on Blades with SAN backend storage, it is
> worth keeping in mind.
>
Most blade enclosures can be found with three-phase power supply options
as well, making it even more convenient. When they take three-phase
directly it's usually a pair of 20A circuits and you're good for full
capacity.
~Seth
