[rrd-users] Re: RRDTool graphs: various questions

Alex van den Bogaerdt alex at ergens.op.het.net
Thu May 27 13:57:09 MEST 2004

On Thu, May 27, 2004 at 11:08:24AM +0100, John Murdoch wrote:

> This does seem logical... but my other, more granular data is in a 15 min (--step 900) RRD, so updating at noon-only is impossible if I stay with the same RRD. :( I am guessing this is the cause of why MIN/MAX points are represented as continuous lines for the whole day. Should I construct a seperate RRD to hold the noon-based data? (see below for my DS/RRD layout)

I have a database with a one-second granularity.  I sometimes update
this database twice a day.  No problem.  Just make sure heartbeat
allows it.

> > > 2) Is it possible to plot two RRAs using the same consolidation function, but with differing steps/rows, on the same graph? I'd like to plot two RRA AVERAGEs of varying granularity on the same graph, but I can't seem to do this. 
> > 
> > There's no problem whatsoever to do this AFAIK.
> Hmmm... this is puzzling me (using RRDtool 1.0.47). I've tried plotting the two different AVERAGES, but rrdtool graph seems to just pick the most relevant to the timescale and plots that twice. Here's my RRD layout (every 15 mins for 3 years):
> "DS:users:GAUGE:1700:0:U", "RRA:AVERAGE:0.5:1:105120", "RRA:AVERAGE:0.75:96:1095", "RRA:MIN:0.75:96:1095", "RRA:MAX:0.75:96:1095"

OK, when you try to fetch the RRAs from the same RRD it will currently fail.

You _can_ graph data from different RRAs on the same graph.  In order to
aquire the data you need to fetch them from different RRDs.

But make sure you test this before you rely on what I say.

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