This is how to create simple RRD graphs using one data source that can be 0 and above. It is not an “ever increasing” counter.
It will look like this:
1. Create the rrd database
I wrote this down in a .sh file so I can go back later and see how it was set up.
$rrdtool create $rrdfile –step 300 DS:movers:GAUGE:600:U:U RRA:AVERAGE:0.5:1:576 RRA:AVERAGE:0.5:6:672 RRA:AVERAGE:0.5:24:732 RRA:AVERAGE:0.5:144:1460
#5 minute step (base interval with which data will be fed into the RRD)
#10 minute heartbeat for the data source
#2 days of 5 minute averages
#2 weeks of 1/2 hour averages
#2 months of 2 hour averages
#2 years of 12 hour averages
2 Add data to the rrd
Also done in a bash script. Because the –step above is set to 300, you need to run this script every 300 seconds (or every 5 minutes). The script specified in $allpools prints the path to a file. Then with $output and $movers that file is grepped for ‘RUNNING’ and then it counts how many lines that was – amount of movers.
movers=$(grep RUNNING $output|wc -l)
$rrdtool update $rrdfile N:$movers
The N: is NOW. $movers is the value you want to plot.
3. Make a graph
Add this to another .sh script. This you can run at whatever interval you want.
#enddate is the same as "now"
$rrdtool graph $alltimeimage --end now --start 1321603000 \
-v from_beginning -t active_movers \
#rrdtool graph /path/to/image.png --end now --start when_I_started_capturing -v label_left -t title_top \
#DEF: as I only have one I only used movers, maybe you can change the names in case you have several data sources
#DEF: you can also use other things than AVERAGE (like MIN/MAX)
#LINE: #000000 is black
$rrdtool graph $lastweekimage --start -1w \
-v last_week -t active_movers \
DEF:movers=$rrdfile:movers:AVERAGE LINE:movers#000000 \
GPRINT:movers:LAST:"Current\: %1.0lf" \
GPRINT:movers:MAX:"Max\: %1.0lf" \
GPRINT:movers:MIN:"Min\: %1.0lf" \
#If you want to make it a little more complex. AREA fills the space between the value and the x-axis.
#GPRINT statements print some values relating to the graph.
$rrdtool graph $last4hoursimage --end now --start end-4h \
-v last_4_hours -t active_movers \
$rrdtool graph $lastmonthimage --end now --start -1m \
-v last_month -t active_movers \
$rrdtool graph $last3monthsimage --end now --start -8035200 \
-v last_3_months -t active_movers \
$rrdtool graph $lastday --end now --start -1d \
-v last_day -t active_movers \
4. Crontab – scheduling
*/5 * * * * /bin/bash /home/$user/rrd/rrd.update.sh > /dev/null 2>&1
#every 5 minutes
*/15 * * * * /bin/bash /home/$user/rrd/rrd.graph.sh > /dev/null 2>&1
#every 15 minutes
5. Final Words
I am not providing the data gathering script here as you probably won’t need it: it lists movers (transfers) on all pools in a dCache system.