[rrd-users] Re: RRDtool and NaN data

Serge Maandag serge.maandag at staff.zeelandnet.nl
Tue Mar 15 22:03:40 MET 2005

> I've just today started using RRDtool with Cacti to try and 
> log some traffic data.
> The RRA files are created with:
> rrdtool create data.rrd   --step 300
> DS:ifInOctets:COUNTER:6000:0:4294967296
> DS:ifOutOctets:COUNTER:6000:0:4294967296
> DS:ifRequests:COUNTER:6000:0:4294967296
> 2. The heartbeat is significantly larger than the step 

Perhaps a bit too significant.

>From the rrdtool create page:

"A long heartbeat can span multiple ``steps'', which means it is
acceptable to have multiple PDPs calculated from a single sample. An
extreme example of this might be a ``step'' of 5 minutes and a
``heartbeat'' of one day, in which case a single sample every day will
result in all the PDPs for that entire day period being set to the same
average rate."

So you should probably wait 6000 seconds to see the database getting


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