At Fri, 01 Jul 2011 16:25:33 +0200 CentOS mailing list <centos@xxxxxxxxxx> wrote:
>
> Colin Coles wrote:
> > On Friday 01 July 2011 12:05, Timothy Murphy wrote:
> >>
> >> Any advice or suggestions gratefully received.
> >
> > If you are thinking of the UPS route a caveat: I have several HP servers and
> > most of them will not work on cheap UPS's as they do not produce the pure
> > sine wave modern HP machines require but rather a crude stepped voltage.
>
> perhaps naively, I'm surprised: doesn't this mean they put crappy PSUs
> in those servers?
> I thought decent PSUs were expected to deal with dirty input AC?
AND *I* thought *switching power supplies* (effectively) rectified the
AC input and then used the DC to drive a higher frequency system to get
the desired output voltages. (The higher frequency means smaller, more
efficient transformers and need smaller filter caps -- all of which
means a lower cost, more reliable, more efficient power supply.) Which
suggests that both the input voltage and frequency are not particularly
critical, so long as it does not have massive spikes/surges or
consistently low voltage.
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