-----Original Message----- From: centos-bounces@centos.org [mailto:centos-bounces@centos.org] On Behalf Of Timothy Murphy Sent: Saturday, July 02, 2011 8:52 To: centos@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/B001985SW...
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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