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Korjavin Ivan
Asked: 2012-01-19 23:07:26 +0800 CST

Is it possible show difference between two graphs in cacti?

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I have cacti with a lot of graphs (interface statistics) and I need show the difference between two of them. Something like traffic=traffic1-traffic2 where traffic1 and traffic2 are interfaces on two separate switches.

Is it possible?

cacti monitoring

2 Answers

  1. Best Answer

    Yes, its possible. For a good example of a similar, but not exactly the same, howto read the following thread and examples:
    http://forums.cacti.net/viewtopic.php?t=8532

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  2. Yes. You need to create a custom cdef.

    http://www.cacti.net/downloads/docs/html/cdefs.html

    Assuming the DEFs are as such Total = a Used = b The cdef=a,b,- should do. It is position dependant; that's bad. But the cure, a COMPUTE data source, will not be introduced until cacti 088 Reinhard

    http://forums.cacti.net/about30395.html

    Go to Graph Management->CDEFs

    Take a look at

    Total All Data Sources

    and

    x Negate CDEF

    .

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