[mrtg] Re: Cumulative graphing issue using "gauge" option - data wrap s after hitting 2^32 Bytes ...

[dhazell at aap.com.au]

Alex
Thanks for your comments. I'm running mrtg on a Windows 2000 server (not my
preference!) so I thought I could use the SNMP_Session.pm and BER.pm perl
modultes that mrtg itself uses to do the snmp querying - I assume it's not
to hard to figure out.

Re your last comment, how do I differentiate between a counter wrap and a
reset ( - check the uptime?)

Cheers
Derek

-----Original Message-----
From: Alex van den Bogaerdt [mailto:alex at ergens.op.het.net]
Sent: Tuesday, 7 October 2003 5:38 PM
To: mrtg at list.ee.ethz.ch
Subject: [mrtg] Re: Cumulative graphing issue using "gauge" option -
data wrap s after hitting 2^32 Bytes ...


On Tue, Oct 07, 2003 at 02:36:39PM +1000, dhazell at aap.com.au wrote:
> Dear all
> I am trying to graph the cumulative usage im megabytes of the ports from
our
> routers to our isps. So far my graphs are quite good except that the OIDs
in
> question that I am monitoring seem to wrap (go back to zero) after they
get
> to around 4000000000 bytes (2 ^ 32 bytes).
> 
> I was thinking that I could write a script to tweak the data that is
stored
> in the .log file to somehow recognise that the counter has wrapped and
> simply process the .log data so that the data continues incrementing
instead
> of going back to zero.

Alternatively: write your own script that queries the device,
handles any overflow (counterwrap), and returns the difference
to MRTG.  MRTG needs to call this script using the external
program; it needs to process the numbers as ABSOLUTE.

Make sure your program knows when MRTG failed to update its log,
and make sure your program knows when a counter was reset rather
than wrapped.

HTH
Alex
-- 
http://www.googlism.com/index.htm?ism=alex+van+den+bogaerdt&type=1

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