Hi
I'm trying to setup an RRD database to kkep a track f "MAX" values of a
counter. My problem is that the values are transformed depending on the
timeslot alignement. That is, if I setup a RRD database receiving a data
every minute, the value is used unchanged if it's store on the beginning
of the minute, while it is transformed (average with previous value) if
it's entered some second laters.
here's a little shell script that produces 2 curves, one with data
stored on the beginning of a minute, the other 30 second laters. As I
keep "MAX" values, curves should be the same (in my mind at least) but
it's not the case.... Run this script, it'll create a "demo.gif" graph
showing the problem.
If anyone can explain...
Paul
#!/bin/sh
FILE1=/tmp/demo1.rrd
FILE2=/tmp/demo2.rrd
NOW=`date +%s`
START=`expr $NOW - 800`
for file in $FILE1 $FILE2
do
/usr/local/rrdtool/bin/rrdtool create $file -s 60 \
DS:Value:GAUGE:300:0:U \
RRA:MAX:0.5:1:120 \
RRA:MAX:0.5:10:360 \
RRA:MAX:0.5:60:960 \
RRA:MAX:0.5:1440:400 \
-b $START
done
FIRST=`expr $NOW - 630`
DELTA=`expr $FIRST % 60`
START1=`expr $FIRST - $DELTA`
START2=`expr $START1 + 30`
/usr/local/rrdtool/bin/rrdtool update $FILE1 $START1:U
/usr/local/rrdtool/bin/rrdtool update $FILE2 $START2:U
START1=`expr $START1 + 60`
START2=`expr $START2 + 60`
VALUE=1
N=1
while [ $N -le 11 ]
do
/usr/local/rrdtool/bin/rrdtool update $FILE1 $START1:$VALUE
/usr/local/rrdtool/bin/rrdtool update $FILE2 $START2:$VALUE
START1=`expr $START1 + 60`
START2=`expr $START2 + 60`
if [ "$N" -le 5 ]; then VALUE=`expr $VALUE + 1`; else VALUE=`expr
$VALUE - 1`; fi
N=`expr $N + 1`
done
/usr/local/rrdtool/bin/rrdtool graph demo.gif -s $START \
--title "Demo" \
DEF:Value1=$FILE1:Value:MAX -v Value1 \
LINE2:Value1#a00000:'Value1' \
GPRINT:Value1:LAST:'Last\: %2.1lf -\g' \
GPRINT:Value1:MIN:' Min\: %2.1lf -\g' \
GPRINT:Value1:MAX:' Max\: %2.1lf -\g' \
GPRINT:Value1:AVERAGE:' Average\: %2.1lf\n' \
DEF:Value2=$FILE2:Value:MAX -v Value2 \
LINE2:Value2#00a000:'Value2' \
GPRINT:Value2:LAST:'Last\: %2.1lf -\g' \
GPRINT:Value2:MIN:' Min\: %2.1lf -\g' \
GPRINT:Value2:MAX:' Max\: %2.1lf -\g' \
GPRINT:Value2:AVERAGE:' Average\: %2.1lf\n' \
-l 0
rm -f $FILE1 $FILE2
--
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