gene heskett
2023-May-16 19:08 UTC
[Nut-upsuser] Synthesize low batt (LB) fron SNMP UPS which doesnot support this?
On 5/16/23 14:09, Carsten Aulbert wrote:> Hi Roger, > > On 5/16/23 17:00, Roger Price wrote: >> Hello Carsten, That's what I did but for a much simpler setup. I live >> in an area with a lot of lightning, and my shutdown criteria is to be >> able to shut down repeatedly during an electrical storm.? The NOTIFY >> and CMDSCRIPT and the upssched-cmd logic are written up in detail in >> chapter 7 of https://rogerprice.org/NUT/ConfigExamples.A5.pdf . >> >> Chapter 8 contains a detailed description of a hypothetical >> installation fed by multiple UPSs. > > wow, that looks like a LOT of content to digest but I'm not so sure if > our problems align that well (but then I only briefly skimmed over it). > > Luckily for us, our power grid is really stable, I think we only had 4 > or 5 outages lasting more than a fraction of a second over the past ~ 15 > years. Thus, we use our UPSes mainly for providing clean and stable > power to our computing center with the bonus of have power when the > mains go down. > > We shut down the compute nodes via upssched and a 30s timer. If the > power cut is shorter than that, they will simply continue running as the > timer is cancelled by nut. Otherwise they will simply power down and > stretch our 6-8 minutes battery buffer to much longer. > > What I'm more worried about then are the storage servers, networking, > head nodes and a couple of special nodes which are powered by both UPSes. > > We could use upssched also for those nodes, but the pipelining of > messages makes it a bit hard to have a final "stateful" service working > around the missing LB flag. This would need to actively query the UPS > and act after battery.runtime or battery.charge is too low overall. My > simple approach there did not work (effectively looping in the script) > as the next message from upssched would simply wait in the pipeline > while my script was still looping. > > We could also use upsmon to call our script instead of upssched which > then would need to handle being called multiple times and coordinate > what to do based on the messages being passed. > > Both cases would probably need our own running service which would need > to be fed messages and then act based on their own UPS queries. Probably > doable, but not that nice. > > Idly browsing the client sources, I guess I could try to add our logic > here[1] and use [2] to gather the battery stats from our UPS and then > decide if this UPS is considered critical or not. But for this, I would > need to dust off/excavate my ancient poor C knowledge ;-). > > I guess I will give this a try unless someone has a brilliant idea and > could save my sanity. > > Cheers > > Carsten >Take an extra vitamin b1 and start hacking ;o) Seriously, if its that important, do as I did when my last wife was dying of COPD. Leave your ups setup as is but for under $10k (USD), have an automatic home sized standby generator installed to run the important stuff, then your power outages won't last more than startup lags, 5 or 8 seconds. Because we have central air, I bought the biggest generac, 20kw, nat gas powered version about 13 years back, but generac hasn't answered the phone in 3 or 4 years, & the controller died a few months back so the label got changed from generac to kohler, same 20kw rating. So I have more than $10k usd in it now, but you should be able to src a smaller one if the AC is not in the picture for quite a bit less. I've had several multiday outages here, plus the 15 minute weekly test so the generac still has the synth oil I put in it to assure cold weather starting, and 157 hours on its clock. Its currently sitting in the back yard, needing a controller or this one fixed, if you are local to northern WV, USA, $5k and a hoist will put it in your pickup. You'll need a transfer switch too.> [1] > https://github.com/networkupstools/nut/blob/e3bdc28476700c7396bdde912e5789ccb7ecb1d7/clients/upsmon.c#L925 > > [2] > https://github.com/networkupstools/nut/blob/e3bdc28476700c7396bdde912e5789ccb7ecb1d7/clients/upsclient.h#LL105C1-L107C33 > > > _______________________________________________ > Nut-upsuser mailing list > Nut-upsuser at alioth-lists.debian.net > https://alioth-lists.debian.net/cgi-bin/mailman/listinfo/nut-upsuserCheers, Gene Heskett. -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author, 1940) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/>
Carsten Aulbert
2023-May-17 05:13 UTC
[Nut-upsuser] Synthesize low batt (LB) fron SNMP UPS which doesnot support this?
Hi Gene, On 5/16/23 21:08, gene heskett wrote:> Take an extra vitamin b1 and start hacking ;o)yeah ;-)> > Seriously, if its that important, do as I did when my last wife was > dying of COPD.:( sorry to hear> Leave your ups setup as is but for under $10k (USD), > have an automatic home sized standby generator installed to run the > important stuff,no room for that and also our set-up is kind of large, the two UPS systems I'm talking about are 800kVA each and without doing the actual maths, I'd guess we would need at least a 100kW generator. That would come with all sort of other problems (getting a room, deciding whether to run all the time for quick mains sync, i.e. generator wheel is powered by mains when not needed, fuel exchange every few months as gas add-ons tend to flocculate(?) when stored too long, ...). So, I doubt that will materialize any time soon ;-) Cheers Carsten -- Dr. Carsten Aulbert, Max Planck Institute for Gravitational Physics, Callinstra?e 38, 30167 Hannover, Germany, Phone +49 511 762 17185 -------------- next part -------------- A non-text attachment was scrubbed... Name: smime.p7s Type: application/pkcs7-signature Size: 4827 bytes Desc: S/MIME Cryptographic Signature URL: <http://alioth-lists.debian.net/pipermail/nut-upsuser/attachments/20230517/36b586d3/attachment.bin>
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- Synthesize low batt (LB) fron SNMP UPS which does not support this?
- Synthesize low batt (LB) fron SNMP UPS which does not support this?