[rrd-users] what to do with data that resets every day
linux at thehobsons.co.uk
Fri Mar 2 00:46:11 CET 2007
Joey Rutledge wrote:
>I am trying to setup some graphs on total connections (mail server)
>and am getting data from the application via a web dashboard. The
>application resets the data for total connections on a daily basis
>back to zero and essentially does a total count of connections for
>each day (COUNTER). I want to be able to setup some rrd graphs with
>this info but can't figure out the best way to go about this. Has
>anyone had to work with data like this and if so what how did you
>handle the ever so frequently reseting of the data to zero?
>Any help that anyone could provide would be greatly appreciated and if
>this is a RTFM issue please point me in the right direction.
IIRC the DERIVE type will deal with this. While data is increasing it
acts like a COUNTER type, but if it decreases it assumes a reset or
counter wrap. I think you'll lose the sample where the counter
resets, but I suppose you could always add some extra sampling either
side of the reset to minimise that.
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