Re: [CentOS] [OT] ups advice
Some of the newer HP servers are very picky about power from UPS's, from what I have read. I have used several Best Ferrups UPSs over the years, other than one that toasted it's transformer, have never had any trouble out of them (just replace the battery every 3 to 4 years). They are picky about their input power, do not run not connect them to an auto regulating transformer (not the proper term?), or on the output of other UPSs, it can cause interesting problems Howard On 4/14/2011 15:33, Lamar Owen wrote: On Thursday, April 14, 2011 02:55:51 PM John R Pierce wrote: http://powerquality.eaton.com/Products-services/Backup-Power-UPS/5125.aspx or similar for this application. I'd take one of those up versus the same size APC SmartUps any day. We have a 5KVA Best Ferrups here that has never worked correctly :-) But I've seen my share of toasted APC's, too. Currently we run older APC SmartUPS (pure sine) for the workstation stuff and Symmetras in the Data Centers. Looking to put in a Toshiba or similar 500KVA in the secondary Data Center later in the year. BTW, another thing the 'good' UPS's do, more important than 'pure sinusoidal output' for computer purposes*, is buck/boost voltage regulation. Yes. * if you're running audio gear off a UPS, you definitely want the sinusoidal output, but thats another market entirely. Or old 3Com Corebuilder/CellPlex 7000 gear, which shuts down with anything but pure sinewave. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] [OT] ups advice
On 4/15/2011 10:48, John R Pierce wrote: On 04/15/11 4:38 AM, Howard Fleming wrote: I have used several Best Ferrups UPSs over the years, other than one that toasted it's transformer, have never had any trouble out of them (just replace the battery every 3 to 4 years). They are picky about their input power, do not run not connect them to an auto regulating transformer (not the proper term?), or on the output of other UPSs, it can cause interesting problems... I don't think they make any FerrUPS anymore. Those were based on a massive ferroresonant transformer which, yes, is very sensitive to the input frequency. Specifically, they don't like generator power, unless it has extremely well regulated frequency output (such as a DC generator with a digital sinusoidal converter) Eaton has the Ferrups line now (still available as far as I know). I have actually run into the input frequency problem in the past with the Ferrups. I was working at a gas company that for political reasons generated their own power inhouse. Had one Ferrups UPS (of 10?) that was complaining about it (kept going online/offline/online There is a parameter in the settings that can be adjusted to allow a greater input freq range on the UPS (59.5 - 60.5 hz is the default range, from what I remember). In this case that took care of the problem. I have 3 1.4kw units at home, no trouble to date running them off of my backup generator (Campbell 5k unit). They are also 18 years old at this point and still going... :o). Running 3 of my CentOS servers at home in fact. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
