[rrd-users] Way to merge files?

Simon Hobson linux at thehobsons.co.uk
Tue Jan 23 17:53:51 MET 2007

Ronald Stamper wrote:

>I use RRDTOOLS to generate a graph that monitors several clusters here at CCP.
>One of the issues, is that we would love to have RRDTOOLS generate 
>graphs for our large cluster, but the cluster is comprised of 164 
>rrd database files.
>We normally tell RRDTOOLS to generate a graph using a dos prompt, 
>but the length of the command needed to get RRD to parse 164 files 
>over flows its buffer.

Can you use it in filter mode ?

Ie, output the parameters to a temporary file, then have rrdtool read 
from this file. I have some graphs that run to 510 stacked elements 
(though from one rrd) so I think you can imagine the length of that 
parameter list !

Having put all the script in a file, I then do :

   /usr/bin/rrdcgi --filter ${TempFile}

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