what kind of UPS will work best?
kline at tao.thought.org
Mon Oct 8 10:10:52 PDT 2007
On Mon, Oct 08, 2007 at 02:36:05AM +0200, Pieter de Goeje wrote:
> On Sunday 07 October 2007, Gary Kline wrote:
> > First, thank to both you and Bart for your cmments. You were
> > *right* about the price. Can I assume that a ballpark would be
> > 400W for each server? (My wife is right: I've got to cut back to
> > three computers:-) I've found one APC 2200VA with a 17minute
> > uptime. 3 times 400W, yes?
> I think this is overkill. Some time ago I was wondering the same thing and to
> verify my guess on the overall power usage of my servers I bought a VA/Watts
> meter (EUR. 39,-). Turns out average wattage is about 90watts per server idle
> and max 130watts under load. On powerup they will use a max. of 180watts for
> less than a second. The servers are simple dual cores with about 2 harddisks
> each. (no screens or other devices attached) Also, the powerfactor was ~0,95
> so that means that for every Watt of apparent power (VA) almost a Watt of
> real power was used. Thus, for my servers I would need something like a
> 500Watt/600VA UPS.
> So my advice is: don't guess but measure.
Thanks a lot. I was thinking of doing something like this;
maybe an ammeter to see how much power each server draws; then
(possiibly add a bit for reserve).
I'm looking at this as a long-time project. Not rushing to do
something completely foolish. So the more accuracy, the better!
> Pieter de Goeje
> freebsd-questions at freebsd.org mailing list
> To unsubscribe, send any mail to "freebsd-questions-unsubscribe at freebsd.org"
Gary Kline kline at thought.org www.thought.org Public Service Unix
More information about the freebsd-questions