[Nut-upsuser] Configuration tunning

Arjen de Korte nut+users at de-korte.org
Fri Nov 6 11:21:30 UTC 2009

Citeren Antoine Gatineau <antoine.gatineau op alcatel-lucent.com>:

> Is there a maximum value for pollinterval in ups.conf? Is it possible that a
> high value conflicts with other linux components (usb timeout for instance)?


> Is there a relation between pollinterval and MAXAGE (in upsd.conf), and
> parameters in upsmon.conf

No (this used to be in ancient NUT versions, but this has long gone).

In almost all drivers, the pollinterval parameter determines how often  
the UPS status is updated. If you increase the time between polls by  
increasing pollinterval, the latency for updates will increase. You  
may miss critical events on the UPS and worse, may be informed about  
the low battery status too late (if at all).

Whether or not this affects your systems depends on the remaining  
runtime on battery when the low battery alarm is raised. You might  
increase the pollinterval to the remaining runtime when the battery  
low warning is raised by the UPS minus the time it takes to shutdown  
the systems that are attached to it. To be on the safe side, you  
should divide this by three to allow for a couple of failed status  

Best regards, Arjen
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