Re: Want to move to all 208V for server racks

[Seth Mattinen <sethm () rollernet us>]

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