[132881] in North American Network Operators' Group
RE: Want to move to all 208V for server racks
daemon@ATHENA.MIT.EDU (Alex Rubenstein)
Thu Dec 2 13:59:44 2010
From: Alex Rubenstein <alex@corp.nac.net>
To: Jay Nakamura <zeusdadog@gmail.com>, NANOG <nanog@nanog.org>
Date: Thu, 2 Dec 2010 13:59:33 -0500
In-Reply-To: <AANLkTi=f18_xL5HeEqRGHo0a0ErzBmCJweMYzuAX66W7@mail.gmail.com>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
> I really want to move all newly installed internal and customer racks ove=
r to
> all 208v power instead of 120v. As far as I can remember, I can't rememb=
er
> any server/switch/router or any other equipment that didn't run on 208v A=
C.
> (Other than you may need a different cable) Anyone have any experience
> where some oddball equipment that couldn't do 208v and regret going 208v?
I can tell you, that from a collocation operator prospective, we want you t=
o do 208v. I'd love to require it in our facilities, but sales people won't=
let me go that far.
Why?
A couple of reasons.. Neutral current, more power delivered using less copp=
er, etc. Personally, I like delivering two L21-30's per rack and call it da=
y - allows for a comfortable 8kw per rack in 2N+1 redundancy. And, it still=
has a neutral if it's needed, which we hope it isn't.
We rarely run into things that require 120v, but it's usually older equipme=
nt. Or, most notably, the 'call home' modems that EMC uses on their SANs.
