[mrtg] Converting from counter to derive

[Greg.Volk at edwardjones.com]

I'm in the process of converting my RRDs from counter to derive in an 
effort to get around the spike-after-reboot problem that has been 
discussed on both this list, the rrdtool list. I have verified that the 
data sources have been conveted to DERIVE type after executing the 
"rrdtool tune test.rrd -d ds0:DERIVE -d ds1:DERIVE" command. However 
the next time mrtg touches these files it converts them back to COUNTER 
data sources. I noticed that if I edit the mrtg perl script, and change 
the following line:

        my %dstype = qw/u COUNTER a ABSOLUTE g GAUGE h COUNTER m 
COUNTER/;
to
        my %dstype = qw/u DERIVE a ABSOLUTE g GAUGE h DERIVE m DERIVE/;

then the data sources in my test.rrd file automatically convert to 
DERIVE type. 

My questions:

Is everyone else doing this?
Are there any known ramifications to the modification above to the mrtg 
script?

I feel like I'm really missing the boat on this one. Nobody else has 
mentioned having to modify the source to get a COUNTER to DERIVE 
conversion to work.

Thank you


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