[rrd-users] Re: problem with displaying metrics of different ranges

Serge Maandag serge.maandag at staff.zeelandnet.nl
Wed Feb 23 20:41:37 MET 2005

> For example, I can do this:
> CDEF:aline4=line4,10,/
> But, instead of a static value of 10, I need a dynamic value 
> that depends on the MAX value of the metric.
> I was hoping to get that information from the info, but all I 
> got for the .max was a NaN:
> rra[0].cf = "MAX"
> rra[0].cdp_prep[0].value = NaN

This not the maximum value in te database.

You want to know the max value of the average RRA within the
Time span you are going to graph. That will define your scaling
Factor. If you don't understand that, I urge you to read the 
tutorial at the rrdtool site.

You can get that average in two ways:

1. do an "rrdtool fetch" with the same time span you use for your
   graph statement. Sort the values by size with awk/perl whatever
   and grab the highest (last) value.
2. copy your "rrdtool graph" statement, remove the lines, area's
   and stacks and PRINT the max value. Grab that and reuse it in 
   your graph statement to scale your line height.

So you'll need to do some scripting.


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