>-----Original Message----- >From: centos-bounces@xxxxxxxxxx [mailto:centos-bounces@xxxxxxxxxx] On Behalf Of >Les Mikesell >Sent: Monday, February 02, 2009 5:20 PM >To: CentOS mailing list >Subject: Re: Emergency rescue help needed > >> I've been buying from the Smart-UPS and Back-UPS range. Those should be ok, >> shouldn't they? > >That depends on how important it is to never fail. If it is extremely >important, you might want something with redundant components like the >Symmetra line. These are designed to keep working with some failed >components and to allow you to replace parts with the equipment on >bypass but still running. The UPS-units serve group-server machines. If one or two should go down it's not really a biggie, although it's not good either. Not critical in any way. Still, one would expect the UPS-units to last more, or at least not fail due to the electronics. Besides, I'd never be able to get the funding for the Symmetra line UPS:es. 8-/ > > All in all about a handfull of them. They're quite pricey... 90% >> of them suffered some kind of a circuit board failure. Not what you'd usually >> expect from a UPS, rather you'd expect the battery to give up first. I bought >> them over a few years, so it shouldn't be a bad batch or something like that. > >You might blame one or two on bad components, but this sounds like >something is wrong with the input power at your location. I assume they >are lasting at least through the 2 year warranty period. We have at >least a few dozen of them and haven't noticed any pattern of problems >other than aging batteries. Are you tracking the in/out power levels on >the smart units to see what they have to deal with? The voltage has been fairly constant here over the years since I started using UPS and logging the voltage and stuff, 238V more or less constantly. It rarely drops below 236V or over 240V. We mainly use the UPS:es to have controlled shutdowns should the power fail entirely - We had some issues a few years back while they built a new school the other side of the road when the power went up and down for a uyear or so, and the diesel-generators didn't start up as expected. This whole building where I work is supposed to be a wartime hospital with power-backups up to yinyang. But it failed when we needed them... #=;-( It might be that the power is too high, although the standard is 240V in Europe AFAIK. Or the UPS-units *may* have been rated for the previous lower voltage-level at 220V, but that sounds a bit farfetched IMO. Unless the units were a (very much) older batch that APC dumped on us... -- /Sorin
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