[rrd-users] Re: Disk Usage per SNMP?

[Erik de Mare]

Hugo van der Kooij wrote:
>Hi,
>
>I am trying to graph diskusage with RRDtools. (Finally changing from MRTG) 
>but it seems it does not work to well.
>
>I initialized the database with:
>
>rrdtool create /etc/stats/aragorn.disk.usr.rrd  \
>        DS:units:GAUGE:600:U:U  \
>        DS:size:ABSOLUTE:600:U:U        \
>        DS:used:ABSOLUTE:600:U:U        \
>        RRA:AVERAGE:0.5:1:576           \
>        RRA:AVERAGE:0.5:6:672           \
>        RRA:AVERAGE:0.5:24:732          \
>        RRA:AVERAGE:0.5:288:732         \
>        RRA:MAX:0.5:1:576               \
>        RRA:MAX:0.5:6:672               \
>        RRA:MAX:0.5:24:732              \
>        RRA:MAX:0.5:288:732
>
>I read the vaules in with:
>
>UNITS=`$SNMPGET -v1 -c mysnmpd aragorn 1.3.6.1.2.1.25.2.3.1.4.8|awk '{print $4}'`
>SIZE=`$SNMPGET -v1 -c mysnmpd aragorn 1.3.6.1.2.1.25.2.3.1.5.8|awk '{print $4}'`
>USED=`$SNMPGET -v1 -c mysnmpd aragorn 1.3.6.1.2.1.25.2.3.1.6.8|awk '{print $4}'`
>rrdtool update $STATDIR/aragorn.disk.usr.rrd N:$UNITS:$SIZE:$USED
>
>I checked the values with an additional echo command and the proper values 
>are returned and fed to rrdtool.
>
>But graphing them seem to be a bit harder.
>
>I tried a simple version with:
>
>rrdtool graph $GRAPHS/aragorn-disk-home.$PERIOD.gif --start -$LENGTH    \
>        -t "aragorn DISK /home $TITEL"                          \
>        DEF:units=$STATS/aragorn.disk.home.rrd:units:AVERAGE    \
>        DEF:size=$STATS/aragorn.disk.home.rrd:size:AVERAGE      \
>        DEF:used=$STATS/aragorn.disk.home.rrd:used:AVERAGE      \
>        CDEF:disk=used,units,*                                  \
>        AREA:normal#7EE600:"used"                               \
>        GPRINT:disk:AVERAGE:"Gemiddeld\:%14.0lf B"              \
>        GPRINT:disk:MAX:"Maximum\:%14.0lf B\n"
>
>But the values shown are not what I would expect. The specific partition 
>is rather large but I was under the impression the RRDtools could handle 
>larger values (> 2^32). See also the df output:
>
>Filesystem           1K-blocks      Used Available Use% Mounted on
>/dev/md7             111207864 103446296   2112320  98% /home
>
>In the long run I would like to use a three color approach. (green for < 
>80%; orange for 80-95%; red for > 95%)
>
>Hugo.
>
>  
>
hi,

I tried that also, and wrote a script for that to monitor each drive on 
the computers in my network.
It uses the Net::SNMP and the RRDs modules for perl, als stores the 
"used" and "total" data in the rrd file.

Erik

attached are 3 sample images and the script


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