I can think of two ways.
First, the best way requires you to be using MRTG with RRDTool and some
frontend (Routers2, mrtg-rrd, 14all, etc).
In this case, you can manually tune the RRD files to have a minimum value of
(eg) 1, so zeros are recorded as Unknowns. See the rrdtool documentation on
how to use rrdtune to achieve this, but it would be similar to:
$ rrdtool tune targetname.rrd --minimum ds0:1 --minimum ds1:1
and you would need to do this for all the targetnames in question, but only
once.
Secondly, you could use either a data collection plugin or a post-processing
plugin to convent retrieved zero values to unknowns. This would work for
Native-mode MRTG as well as for RRD-mode, but would require a small amount of
perl coding knowledge in order to write the plugin.
This would require you to first create a file called (eg) conversioncode.pl
containing something like this:
sub nozeros {
my $value = shift;
return ($value?$value:undef);
}
then define the file to MRTG in the .cfg file:
ConversionCode: /path/conversioncode.pl
and finally use it in your Target definition:
Target[something]: oid&oid:commun...@host|nozeros
Hope this helps...
Steve
________________________________
From: [email protected] [[email protected]] On Behalf
Of Ufuk Eskici [[email protected]]
I want to use a function in MRG. I want to discard zero values.
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