[rrd-users] Re: Sudden spike in RRD graph

[Alex van den Bogaerdt]

Tay Chee Yong wrote:

> >
> >Could this be due to a counter reset?  Have you set proper
> >max values (rrdtool tune) ?
> >

> I am running my cron every 5 minutes to perform rrdtool update. So where 
> and when should I use rrdtool tune? Do I specify in the cron also?
> 
> Does the following help??
> 
> rrdtool tune data.rrd -i ds-name:U -a ds-name:U

That would UNset the maxima (if it works at all, didn't try).

You only need to do it once, set it to the maximum byte rate
you'll ever expect to encounter.  It doesn't protect against
all counter resets but it will protect against many of them,
especially if you're using 64-bit counters.

HTH
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