[rrd-users] newbie rrd question - probably a very old issue

Dan Gahlinger dgahling at hotmail.com
Sat Sep 1 04:06:24 CEST 2007

I'll have to do this tomorrow or tuesday (monday is a holiday here),
and I don't have access to it at the moment.

you may be correct that we are asking it to consolidate, and we don't want 
to. we simply don't know.
it just seems, totally wrong.

we used to have the RRD file setup for a years worth of data points, and it 
was still doing this.

what's the point of defining so many data points if its going to consolidate 
it anyhow?

we have learned it is NOT the graphing function doing it, though.

if we look at the raw data it is correct, but if we query the data, we get 
the consolidated results.
it shouldn't be consolidating.

there is no reason that an RRD file created with 93 days of data points 
should start consolidating data after only one week - or less. there has to 
be something we're doing wrong.

so i'll post it either later this weekend or at latest tuesday.

>From: Alex van den Bogaerdt <alex at ergens.op.het.net>
>To: rrd-users at lists.oetiker.ch
>Subject: Re: [rrd-users] newbie rrd question - probably a very old issue
>Date: Fri, 31 Aug 2007 19:35:57 +0200
>On Fri, Aug 31, 2007 at 01:07:44PM -0400, Dan Gahlinger wrote:
> > for example, we do a 1 day graph and the "maximum" is 90
> > we do the same graph for 1 week and the "maximum" has magically changed 
> > 30
> > do it again for 1 month, and it gets even worse.
>An RRA stores average, minimum or maximum rates.
>GPRINT writes the average, minimum or maximum on the graph.
>If you are graphing data from an AVERAGE RRA, you can print the
>maximum of those averages, not the maximum out of another RRA.
>1 step per row:  1,2,3,4,5,6,7,8,9,10,11,12
>MAX(1,2,3,4,5,6,7,8,9,10,11,12) -> 12
>consolidation function average, 3 steps per entry:
>avg(1,2,3),avg(4,5,6),avg(7,8,9),avg(10,11,12) -> 2,5,8,11
>MAX(2,5,8,11) -> 11, not 12.
>consolidation function average, 6 steps per entry:
>avg(1,2,3,4,5,6),avg(7,8,9,10,11,12) -> 3.5 , 9.5
>MAX(3.5,9.5) -> 9.5, not 12
>and so on.
> > but when we check the raw data, we can see all the data points are 
> > if we have so many data points, it shouldn't be consolidating the data, 
> > it is.
>It shouldn't? Or perhaps you ask it to do so but don't want to?
> > and it's driving me crazy trying to figure out why.
> > we thought of using separate data files for min, max and average, but 
> > the data storatge and triple the overhead is killing our server.
> >
> > can someone tell us what we're doing wrong or give us a suggestion so 
> > the data will be reported properly?
>Post the command you use to create your RRD file.  Also post the
>relevant parts of your graph command.
>Keep it simple. We don't need to see all fancy formatting and such,
>a simplified example would be best, as long as it shows what you are
>talking about.
>Alex van den Bogaerdt
>rrd-users mailing list
>rrd-users at lists.oetiker.ch

Windows Live Hotmail. Even hotter than before. Get a better look now. 

More information about the rrd-users mailing list