Hi All,

I was trying to do some graphing of the Disk Usage of the my root partition.

I tried it with rrdtool,but I am not able to create any graph.

I followed the below steps

1. Creating a rrd database file

rrdtool create diskusage.rrd --start N DS:Usage:ABSOLUTE:600:1:100 RRA:AVERAGE:0.5:1:432

I then updated the rrd file with below cron entry,

*/5 * * * * rrdtool update /home/athreya/diskusage.rrd N:`/home/athreya/rootdiskuse.sh`
==================================================================
/rootdiskuse.sh is

#!/bin/bash

df -h / | awk '{ print $3}' | tail -1 | sed 's/G//'

===================================================================

After 30 mins I tried to fetch the data from the rrd file


root@pclinux:/home/athreya# rrdtool fetch diskusage.rrd AVERAGE --start N
Usage

1252224900: nan


Why no data is coming into the rrd file ?

Please help ,

Regards,

Athreya

Read the man page for rrdtool update. The way you're calling it won't work with what you're doing, with the external script. I'd put the rrdtool update command at the bottom of the rootdiskuse.sh script, and put that in CRON, but again, verify the command first. rrdtool is picky about what it will work with.....