[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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