[mrtg] Re: Ping Probe Question

[Peter W. Osel]

> *** Jason Humes <jhumes at acs.on.ca>
> *** [2003-03-07 07:53:31]:
> I've setup ping probe to monitor latency times and packet loss...most of the
> graphs show zero loss (Fibre links) but a couple show a loss in only
> percentage (from 7%-15%), not packets.  What does this percentage mean?  I
> would think that it would the loss percentage would be a multiple of 25, 4
> pings sent, 1 lost would equal a loss of 25%, 2 lost would equal a loss of
> 50%, etc.  Thanks.

Jason,
the default for mrtg-ping-probe is to send 10 pings, then you could see
values 0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 % returned from
mrtg-ping-probe.  The question then is does mrtg average these values
over a period of time ...  Look into the mrtg log file, mine e.g. looks
like this:

grep -v " 0 0 0 0" rubycon.loss.log | head

1047055815 0 0
1047044400 0 0 10 10
1047044100 10 10 10 10
1047043800 9 9 10 10
1047039900 0 0 10 10
1047039600 9 9 10 10
1047032700 0 0 10 10
1047032400 9 9 10 10
1047029400 0 0 10 10
1047029100 9 9 10 10


The format of the logfile is documented here:
http://people.ee.ethz.ch/~oetiker/webtools/mrtg/logfile.html

note that colume 2 and 3 are the average since the last measurement,
hence you get numbers we initially did not expect to see.

Include this option for your target:

WithPeak[rubycon.loss]: ymwd

to see the peak values in addition to the averaged values


Hope this helps

	--pwo


--
Peter W. Osel                   Principal - Development Systems
Infineon Technologies           Email: pwo at Infineon.COM
North America Corp.             Phone: +1 (408) 501 6321
1730 North First Street         Fax:   +1 (408) 501 2410
San Jose, CA 95112, USA         WWW:   http://pwo.de/

pgp key fingerprint = 79 2D DD 49 C0 AA D8 CF  2C F9 A5 6A BA 37 0E 28

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