[rrd-users] Re: Displayed data in rrdgraph is not the same as the input data

Judith L. Pancho judith.pancho at latitudebroadband.com
Tue Jan 23 02:45:31 MET 2007

Peter Valdemar Mørch wrote:
> Judith L. Pancho judith.pancho-at-latitudebroadband.com |Lists| wrote:
>> I'm using rrdtool to monitor the network traffic. ...
>> Your help would be greatly appreciated.
> Hi Judith,
> If you update your rrd file exactly on step boundaries, the output data 
> will be exactly your input data. So if you want your output data exacly, 
> make sure your timestamp on update is exactly e.g. 12:00:00 and not 
> 12:00:02.
> When the update timestamp is slightly off, rrdtool compensates the input 
> value for that, because internally it doesn't store your update time. 
> So, in effect, rrdtool compensates for my sloppy system where cron jobs 
> don't run EXACTLY on time. That is probably why you don't see your input 
> values exactly on output.
> Peter
Thanks Guy for the clarification that helps me a lot...


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