[Os-sim-devel] rrd_plugin.pl + one more strange thing...

[W. <joe...@ei...>]

Hi,

i'm looking to Holt-Winter algorithm with RRD (HWPREDICT). I noticed in
rrd_plugin.pl that you never fetch alpha and beta values in the
framework config table. Configured in CONFIGURATION -> RRD CONFIG...
Quite strange !! So it mean those values are never used by the
algorithm ...

Holt-Winter RRDtool function call:
RRA:HWPREDICT:<array length>:<alpha>:<beta>:<period>

Your HWPREDICT call look like this:
my $result =3D `$rrd_bin fetch $file HWPREDICT -s $stime -e $etime | grep
$etime`;

We can see you never use alpha, beta and period (only a data range "-s"
and "-e")!! You should also put a period configuration in  CONFIGURATION
-> RRD CONFIG because when i did an excel sheet to check parameters
effect with holt-winter, i found that period (m param) was really
important for prediction !!
When www.fullsecurity DNS entry will be set, you will be able to
download this excel an OpenOffice file here:
http://www.fullsecurity.ch/security/sims/download/download.jsp

Informations about RRDtool can be found here:
http://cricket.sourceforge.net/aberrant/rrd_hw.htm#_Toc491746735

Let me know what do you think !! Thanks a lot and read you soon...


Jo=EBl Winteregg