> -----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 > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos >