[rrd-users] Re: Preventing counter wraps

Jerome Fleury jerome.fleury at none.net
Tue Jul 4 19:06:06 MEST 2000

Tobias Oetiker wrote:
> Today you sent me mail regarding [rrd-users] Preventing counter wraps:
> *>
> *> Is there any way to prevent RRDTool from detecting counter wraps ?
> *>
> *> I mean: when my equipment reloads itself, counters reset, and rrdtool
> *> assumes it is a counter wrap, that is not, and generates peaks on the
> *> graph.
> 1. make sure you define MIN and MAX rate values for the datasource this
>    should catch most false positives ...

But not clean enough. Because values can still pass this check with 32
bits counters.

> 2. you can use DERIVE instead of counter ... this has no wrapp
>    detection ...

But I don't want to skip wrap detection :)

> if you were polling the 64bit hi* counters you could ...

My equipment doesn't do 64 bit counters.

What about a "nowrap" option to rrd_update ?

Jerome Fleury      none Networks / Freesbee
Network Team
+33 1 45082314

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