[rrd-users] Re: Graphing total bandwidth usage

Simon Amor simon.a at webfusion.co.uk
Thu Mar 2 18:17:14 MET 2000

On Thu, Mar 02, 2000 at 05:04:07PM +0100, alex at ergens.op.Het.Net wrote:
> Simon Amor wrote:
> > 
> >  I've just started using RRDtool-1.0.13 to log byte counts for each port on
> > each switch so we can monitor bandwidth for each server. The values are
> > combined in/out bytes instead of separate, but this isn't too much of a
> > problem. When I try and graph the information, I end up with what looks like
> > deltas rather than absolute values.
> That is correct.  They look like delta's but in fact they represent the
> delta of the data divided by delta of the time.  This way, you should
> end up with octets per second.
> If you want to log your actual counter values, you should use the GAUGE
> data type, not the COUNTER.  Even in that case, you may end up with
> values that are not exactly what you put in the RRD (due to interpolation)

If I use rrdtool tune to change the type from COUNTER to GAUGE, do I need to
zero the rrd to get rid of data which isn't absolute values or does it store
the actual absolute value and calculate deltas when generating the graph?
Simon Amor
simon.a at webfusion.co.uk

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