On Sat, Nov 23, 2024, at 8:13 AM, Greg Troxel via Nut-upsuser wrote: > Dan Langille via Nut-upsuser <[email protected]> > writes: > >> I have an idea for my shutdown process at home. My goal: maximize the >> network run-time. At present, the UPS has a run-time of about 57 minutes. >> >> This is my idea: >> >> * shutdown the servers after 15 minutes of downtime (for me, that's when >> battery.runtime hits 40) >> * leave the network gear (switches, firewall, wifi) running so I can >> continue with Internet access
.... > The other thing is that I more or less believe that running the UPS all > the way out is probably rougher on batteries than shutting down when it > claims 10m. But I also believe that UPS service is really tough on > batteries and they seem to be reliably in need of replacment at 4 years. > And, almost every battery I have pulled from a UPS (which I do when it > becomes troubled) has been messed up, usually a shorted cell or a very > weak cell. Whereas batteries proactively pulled after 5y from a FiOS > ONT, are often ok. So I am not at all sure that trying to be nice to > the batteries is a good strategy. I agree. I thought about that when I was writing my post. I'll aim to shut down when there is about 10-15 minutes left. > So I would recommend: > > - shut down servers after 5 minutes of outage > - shut down firewall and killpower when runtime <10m (or maybe 5m) > - have some way to start servers, such as switch controllable by > firewall I have an Eaton APU - which I first need to clean up and document what is plugged in where. > - once you have a way to bring servers back hands off, consider server > shutdown at 30s of outage, and restore after 15m of no outage 30s is a bit short - but I take your meaning. I have spoken with my electricity supplier and none of my outages were less than 30 minutes. > - going over all your non-server stuff and thinking if you can reduce > usage > > - log outages and also transfer to battery events. log remaining > runtime vs time so you can see what the mapping is from reported > runtime to actual runtime I'm doing that via LibreNMS over SNMP in 5 minute increments. That might be fine enough. That log remaining runtime will not get logged once the server go down - that's what does the logging. > Your outage patterns may be different, so I may be off about the precise > timings. I suspect though, that there is a gulf between "protection > device restores power in seconds" and "truck roll". 28m for drive to > fault, visually inspect, decide it's cleared, replace fuse, is amazing > and only happens if the people are in the office next to the truck, and > even then it needs more luck. -- Dan Langille [email protected] _______________________________________________ Nut-upsuser mailing list [email protected] https://alioth-lists.debian.net/cgi-bin/mailman/listinfo/nut-upsuser
