[rrd-users] Holt winters

[Darryl Lewis]

I'm trying to figure out how H-W forecasting works in rrdt. I changed a little simulation program that makes an rrd and graphs it in realtime, which I'm using to play with the variables and to experiment.

I've got the following:

DAY=1
GENERATIONS=60
PERIOD=$(($DAY * $GENERATIONS))

rrdtool create sim.rrd --start 'N' --step $DAY \
        DS:sim:ABSOLUTE:$DAY:0:U \
        DS:unk:ABSOLUTE:$DAY:0:U \
        RRA:AVERAGE:0.1:1:$GENERATIONS \
        RRA:HWPREDICT:$GENERATIONS:0.5:0.5:$GENERATIONS


I get the following:
ERROR: can't parse argument 'RRA:HWPREDICT:60:0.5:0.5:60'
Any ideas?


Also, the rrd help pages don't show how to graph it...

    rrdtool graph tmpgraph.gif --start -$PERIOD \
        DEF:vsim=sim.rrd:sim:AVERAGE \
        DEF:vunk=sim.rrd:unk:AVERAGE \
        CDEF:real=vsim,$DAY,* \
        CDEF:unrl=vunk,$DAY,* \
        AREA:real#FF0000:"Number of spam messages" \
        STACK:unrl#0000FF:"Number of false negatives"

Any ideas what I need to add to get it to graph?


Darryl.

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