[CentOS] Power-outage

Jason Pyeron jpyeron at pdinc.us
Sat Jul 2 13:00:54 UTC 2011


> -----Original Message-----
> From: centos-bounces at centos.org 
> [mailto:centos-bounces at centos.org] On Behalf Of Timothy Murphy
> Sent: Saturday, July 02, 2011 8:52
> To: centos at centos.org
> Subject: Re: [CentOS] Power-outage
> 
> Emmanuel Noobadmin wrote:
> 
> >> It seems to me that it should be possible to have a simple, 
> >> torch-battery operated, system which will keep the machine 
> alive long 
> >> enough to make a graceful exit.
> 
> > Like others have suggested, a cheap UPS is the way to go.
> 
> I'm convinced.
> Could you (or anyone) suggest a cheap UPS?
> This is only a tiny server (HP MicroServer) on a home LAN.

http://www.amazon.com/APC-Back-UPS-shutdown-software-UPS-BE350G/dp/B001985SWW/

> 
> > The problem
> > with your idea is that you'll need a DC to AC inverter that 
> can handle 
> > the output current required by your server and something to 
> hold the 
> > batteries (you'll need more than one because attempting to 
> draw a huge 
> > current from a normal battery will either kill it or at the 
> very least 
> > cause it to have a shorter than expected capacity) and everything 
> > together, it's probably going to cost more in both money 
> and time to 
> > have this thing.
> 
> I'm sure you are right, as I know nothing at all about power supplies.
> But surely computers actually use DC,
> so couldn't my torch-battery device just supply the PC 
> components directly?
> 

You will either need many different batteries for the different voltages (1.2,
3.3, 5, 12, -12, -5) or a DC ATX power supply (not cheap and not very powerful
until the 48V input variety)


> Many decades ago I went to lectures at university given by 
> Fred Hoyle (famous at the time for a TV series where he said 
> God was unnecessary).
> The lectures (on thermodynamics) were not really very good, 
> but they were interesting because Fred Hoyle was slighly 
> paranoid, and believed evil capitalists were foisting 
> unnecessary devices on us.
> 
> One of his pet theories was that cars did not need huge 
> accumulators, but could be started with a torch-battery.
> 
> Another was that incandescent bulbs were deliberately made to 
> fail after a certain time.
> 
> Another was razor blades, which according to him could easily 
> last for ever.
> 
> One interesting idea was that instead of nuclear power 
> stations it would be cheaper, and give the same energy, to 
> plant trees in a strip around the equator (I forget how wide).
> 
> 
> 
> 
> 
> 
> --
> Timothy Murphy
> e-mail: gayleard /at/ eircom.net
> tel: +353-86-2336090, +353-1-2842366
> s-mail: School of Mathematics, Trinity College, Dublin 2, Ireland
> 
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