[rrd-users] Re: Consolidation many RRDs to 1 RRD

Chan Chi Hung chihung at mc-3.org
Fri Feb 20 09:21:54 MET 2004

Hi Richard,

I tried to create a Tcl script w/ tdom extension (www.tdom.org) to parse 
all the rrd dumps and consolidate the results. It is slow and not 
efficient in this way. The rrd graph with DEF and CDEF is very fast and 
efficient in processing and summarising all these info.

It may be the XPath queries that take up most of the computation time 
and I do not have time to explore further. What I did now is to that 
while I am collecting the data and feeding them into rrd, I do some 
calculation and consolidate the result in a new rrd file.

--Chi Hung

Richard Lithvall wrote:
>>I have 100+ RRD files that I want to graph the consolidated result. I
>>can DEF and CDEF to get what I want but it is getting very lengthy
>>and messy if I have a lot of RRD files. It may even overflow the
>>amount of buffer in the command line argument.
>>Is it possible to 'concatenate' all these RRD files into one single
>>RRD. The RRD files are created and updated at the same time and
>>having the same definition and DSs.
> Hi Chan,
> I'm facing the exact same problem and was thinking of dumping the RRDs
> to XML and, in a perl script, summarize the data and then build a new
> RRD from the resulting XML. But this is messy as well so I'm curious if
> you found out another way to solve this.
> Regards,
> /Richard


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