On Saturday 06 Dec 2003 7:24 pm, John Richard Smith wrote: > Carroll Grigsby wrote: > >John: > >Neither one. The first one is just a PSU; the second one is > > probably way too big for your needs. (But then, I don't know what > > your needs are, do I?) That puppy should be able to back up five > > or six workstations without breaking a sweat. > > > >I went through this exercise last year, and ended up with a 525 VA > > Belkin. I would have preferred an APC, as they work right out of > > the box with Linux, but the Belkin did a better job of matching > > up with some hardware constraints that I had. IIRC, it cost about > > $135. It has sufficient reserve to keep my system up for > > something like ten minutes -- adequate to do finish up whatever > > I'm doing and shut down. > > > >A couple of things to look for: Either USB or serial feedback -- > > this will allow you to monitor the state of the batteries (hence > > the need for Linux support), separate ports for such > > non-essential devices as speakers and printers (these will have > > surge protection, but not power backup), and, if you have a > > modem, a protected telephone line. > > > >I went to the liebert site (http://www.liebert-hiross.com/), and > > found some appropriate units clicking down through UPS ==> > > workstations. What I didn't find on their site was any help on > > sizing and selection. APC has some very good information at their > > site, although they may try to sell you more capacity than you > > may need. > > > >-- cmg > > Forgive my utter ignorance here. > > An UPS, > does it sit between the ring main and each > individual computer.
Yes > If the latter then in the case of a situation > as I have , namely 4 computer within the one building, then I would > have to constuct a new power supply setup so that each computer is > powered off the same circuit whereever they are situated.Not an > easy task for me. You can get a network UPS, but it will cost you an arm and a leg. I decided that most of the computers here are only on when being used, so don't need auto-clean-shutdown. This is the 24/7 box, and I decided to get auto-shutdown for this one. > So an UPS, it's basically what, a big battery > that supplies mains voltage for a period while the system powers > down of it's own accord, or until you power it down manually, > because if the later, what happens if your not there to power it > down yourself. Inexpensive ones hold it for a time - generaly 10-20 minutes, allowing you to manually shutdown. APC ones can run with apcd, which does the auto-shutdown. > Also, while an UPS keeps things going for a while, does an UPS > prevent damage during a power surge on start up ? > Yes Anne -- Registered Linux User No.293302 Have you visited http://twiki.mdklinuxfaq.org yet?
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