[rrd-users] Advanced CDEF Question
dayton at digidefense.com
Wed May 26 22:03:47 MEST 2004
I'm using some CDEFs to combine the throughput on Traffic graphs (ie i
have 4 servers in a load balanced cluster, and i want the combined
totals for IN and OUT for all of them together in one graph)
Anyways, Ive got this working, using the CDEF
a,b,+,c,+,d,+,1024,*,8,* (to change to bits and mult by 1024)
Where data source a,b,c,d are the INs from Servers 1-4, and e,f,g,h
are the OUT's from Servers 1-4
This all works perfectly.
Now I have another area on my graph that shows me the difference
between the in and out (traffic savings on behalf of caching on a squid
proxy) the CDEF is:
This is represented on single graphs where there is only 1 interface.
1 in, 1 out. This works fine.
I want to be able to see this CDEf on my combined graphs too, so i
created a new CDEF:
Substituting the combination CDEFs for b and a respectively.
When i look at the graph in graph debug mode, It just shows a broken
graph, and "RRDtool Says: "
Normally it would say OK, or if there was an error, spit out what the
error was. This is obviously making it hard to debug.
Can anyone make any suggestions?
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