[rrd-users] Re: Help wint customization

[Alex van den Bogaerdt]

Bryan Vest wrote:

> I can see that this line is pulling the numbers from somewhere:
> 
> "GPRINT:$mds1:MAX:Max $sout", "GPRINT:mpcout:MAX:(%2.0lf%%)",
> 
> Does ayone know how i can pull the data used by this GPRINT function to use
> in another area?

By far the easiest is to use another RRDtool command.  Use rrdtool graph
without actually creating an image.  Only use PRINT (not *G*PRINT) and
collect the output to use it as input for the next run.

> my $modemsinuse = qx(/usr/local/rrdtool-1.0.33/bin/rrdtool fetch $rrd
> MAX --start end-4minutes);

Close, you should use "graph", not "fetch".  You can then query
MAX, MIN, AVERAGE and LAST as you're used to do.

   rrdtool graph /dev/null
      DEF:....
      ...
      CDEF:....
      ...
no LINE, AREA, STACK or GPRINT
      ...
      PRINT:ds0:MAX:%10.2lf

Now you can use $modemsinuse in the next rrdtool command, spanning
the same time range yet actually creating the graph.

If you like you can also have a look at the 1.1.x version.  This is
alpha code but I think VDEF is suitable to solve your problem.
If you want to test it and comment on it that would be great.

HTH
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