On Wed, Oct 12, 2011 at 09:08:05AM -0400, Jerry Feldman wrote:
We are running 2 208VAC circuits. We have 7 old Intel Whitebox systems
...
(http://goo.gl/L3GpJ). I preferred the 5-20R because all of my systems
can plug directly into it without me having to add additional cables.
5-20R are
From: Matt Shields [mailto:m...@mattshields.org]
I also have a killawatt but the problem comes when I have to work on
someone else's live equipment. The clampon ammeter means I don't have
to shut the server's off. I can also clamp on to the rack's main power
feed if I
don't have a APC PDU.
Matt Shields wrote:
The clampon ammeter means I don't have to shut the
server's off. I can also clamp on to the rack's main power feed...
I gather there is a point in the power feed where you can access the hot
conductor separately from the neutral?
Others may not be aware that you can't just
Edward Ned Harvey wrote:
Hold it. P=VI is a DC rule. Power is more complex in AC.
What's the difference between VA and W?
If you have inefficient power supplies, you might be overpaying 30%
for power.
You're referring to power factor:
http://en.wikipedia.org/wiki/Power_factor
The
I think it was Apple (Apple II) that used the first switching power
supply, but that was at the time when competition was limited to a few
hobby computer builders (about 1977).
On 10/13/2011 12:29 PM, Tom Metro wrote:
Edward Ned Harvey wrote:
Hold it. P=VI is a DC rule. Power is more
One question I have is in planning. One day we received a shipment of
about 5 or 6 Intel systems from out Toronto office. We ordered a rack,
switch, and a rack KVM. We initially plugged everything in to a wall
outlet. ran fine until it tripped a breaker, and the breaker box was not
in the
On Thu, Oct 13, 2011 at 1:00 PM, Jerry Feldman g...@blu.org wrote:
One question I have is in planning. One day we received a shipment of about
5 or 6 Intel systems from out Toronto office. We ordered a rack, switch, and
a rack KVM. We initially plugged everything in to a wall outlet. ran fine
From: discuss-bounces+blu=nedharvey@blu.org [mailto:discuss-
bounces+blu=nedharvey@blu.org] On Behalf Of Matt Shields
A long time ago I got fed up with trying to calculate amperage, so I
invested in a clamp on ammeter. Then I test my servers when I get them
and
record the high and
On Thu, Oct 13, 2011 at 8:46 PM, Edward Ned Harvey b...@nedharvey.comwrote:
From: discuss-bounces+blu=nedharvey@blu.org [mailto:discuss-
bounces+blu=nedharvey@blu.org] On Behalf Of Matt Shields
A long time ago I got fed up with trying to calculate amperage, so I
invested in a
From: discuss-bounces+blu=nedharvey@blu.org [mailto:discuss-
bounces+blu=nedharvey@blu.org] On Behalf Of Matthew Kowalski
Does anyone have any experience with running server equipment (Dell
Power
Edges, HP Proliant DL G7s HP c7000 Enclosures) at 208 VAC instead of 120
VAC? Right
Back in the days of mainframes, 208 3ph was a normal choice. Especially for
large disk drives (large datawise for back them, today they are just
large physically).
If you are doing mainframe datacenters, yes, 208 3ph is still a
reasonable standard.
And even APCC sells UPSes that deliver that too
Does anyone have any experience with running server equipment (Dell Power
Edges, HP Proliant DL G7s HP c7000 Enclosures) at 208 VAC instead of 120
VAC? Right now we're running 20 Amp circuits at 120 VAC but I've been
reading some on the web about better efficiency at 208V along with
additional
I have a similar arrangement in one of my rooms but we haven't
exercised the switchover to 208V because we implemented a number of
power saving features on the 120V circuits that resulted in us
never needing (or more accurately never getting) additional power to
the servers. We have various
13 matches
Mail list logo
