Adding values from multiple data sources

[aratux]

Is it possible to get the total of multiple data sources graphed in cacti ??
I want to graph the bandwidth used by each router alone.
And I want to be able to graph the total Bandwidth consumed by all these routers, on one graph too.
Is cacti able to perform addition based on rrd files ??

Regards

[raX]

Yes, this is exactly what a CDEF is for. For instance, to create a CDEF that adds up the first 5 items on a graph, you could use:

Code: Select all

a,b,c,d,e,+,+,+,+

You could then add this into cacti by going into "CDEF's", and adding a "Custom Entry" to a new CDEF with the text above. Then when you go to create your graph, just use this CDEF.

You can also save yourself a lot of time by using the "Total All Data Sources" CDEF, which automatically does this for most graphs.

-Ian

[aratux]

I have already tried the CDEF : Total all data source.
But it doesn't seem to work, or rather to say, I am little confused.
Let us go step by step.
I have to add 6 ( for example) graph items.
And define a datasource for each graph item.
but really, I want to graph only the total of those six datasources.
Then, do I have to define the CDEF: Total all data sources, for each graph item ??
Or do I need to have a 7th graph item that only has the Total all data sources CDEF defined ???


Regards