[rrd-users] Re: Monitoring System Load (graphing it)

Alex van den Bogaerdt alex at ergens.op.het.net
Fri Dec 5 11:28:52 MET 2003

On Fri, Dec 05, 2003 at 10:21:44AM -0000, David Jenkins wrote:

> I have also read "man rrdtutorial" a couple of times but I do obviously
> not understand something fundamental.

> /usr/local/bin/rrdtool create /home/dj/public_html/rrdtool/loadavg.rrd \
>    DS:1min:COUNTER:600:U:U   \

Counter.  You expect something that increases over time and you expect
(current_counter-previous_counter)/(current_time-previous_time) to return
some number.

> $min1 = `/usr/local/bin/snmpget -Ov $ip_address public laLoad.1`;
> #$min5 = `/usr/local/bin/snmpget -Ov $ip_address public laLoad.2`;
> #$min15 = `/usr/local/bin/snmpget -Ov $ip_address public laLoad.3`;

This usually produces a GAUGE.  (current_value - previous_value) is
near to zero and can even be negative.  Dividing it by (current_time
- previous_time) makes no sense.

I guess this is the part, indeed a fundamental part, you didn't grasp.

I suggest you focus on the differences between COUNTER, DERIVE, ABSOLUTE
and GAUGE before you continue.


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