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

Tay Chee Yong tcy at pacific.net.sg
Fri Mar 8 06:49:14 MET 2002

Hi Alex,

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

Please advise



At 11:40 AM 3/7/02 +0100, Alex van den Bogaerdt wrote:
>Tay Chee Yong wrote:
> > I have implemented a large scale RRD plotting on all of my edge routers. I
> > am plotting the rate-limit traffic for my customers, but however, whenever
> > I change the value of the rate-limit (eg. from 1Mbps - 2Mbps), there will
> > be a sudden spike in the RRD graph, like the one shown in the attachment.
>Could this be due to a counter reset?  Have you set proper
>max values (rrdtool tune) ?
> > And what does the 'P' in the graph means?
>Peta, which is 10^15.  You are using 64-bit counters?
>    __________________________________________________________________
>  / alex at slot.hollandcasino.nl                  alex at ergens.op.het.net \
>| work                                                         private |
>| My employer is capable of speaking therefore I speak only for myself |
>| Technical questions sent directly to me will be nuked. Use the list. |
>| http://faq.mrtg.org/                                                 |
>| http://rrdtool.eu.org  --> tutorial                                  |

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