[rrd-users] couple of questions

Ricardo Kleemann ricardo at americasnet.com
Thu Sep 9 05:08:56 CEST 2010

Thanks Darren.

How do I go about doing a TOTAL VDEF? That would take care of summing
up the data points between start/end?

You're right, what I meant was to print it, on the legend I guess is


At Wednesday, 09-08-2010 on 17:26 "A Darren Dunham"  wrote:

On Wed, Sep 08, 2010 at 01:26:02PM -0700, Ricardo Kleemann wrote:
> Thanks Simon.
> I'm not yet very familiar with rrdtool, but could I read out data
> values for an arbitrary period between time1 and time2 and add up
> values to come up with accumulated?
> I was thinking of a page where I could choose the dates and then
> a graph drawn for those dates, including the accumulated values as
> well.

Simplest is to pass that to rrdgraph as new --start and --end times
then use a TOTAL VDEF to sum them.

If you truly want to sum something that is only a subset of the
I'd probably try to construct a CDEF from the original data and have
nulled out outside the region of interest. Then run TOTAL on it as

> >I would like to also display an accumulated counter (say total?
> >bandwidth for the month), how would I do that on the graph and on?
> >the rrd table?

If you generate a total with a VDEF, you can print it as part of the
legend with GPRINT or to stdout with PRINT. I don't really know what
you mean by "on the graph".


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