[mrtg] MRTG to monitor Gigabit-ethernet with counter32 and interval: 1

[Michael Markstaller]

Just a quick question, I have to monitor a 3Com Superstack 4900 GE-switch which seems to have no SNMP-v2c at all and so no 64Bit-counters ifHC*Octets. 
So far so bad, I understand the whole problem; when traffic hits 114 MBit, counters wrap etc..

A possible way out I thought of now is to run MRTG (with RRDtool for sure) more often with "Interval: 1" which should give me at least graphs up2 ~570Mbit.
Am I right ? Anybody done this that way, is there something else to consider ? I created the RRD's with mrtg-2.9.29, are they capable to handle the high values by default or do I have to alter them (I'd find out how)
I thought to create a separate mrtg instance only for these two switches to not tamper the other graphs. 
Just to make sure: I really don't want to make mrtg run with a higher resolution, I only want to monitor the GE-ports with 32bit-counters. another question (I know it was asked a thousand times, but only to enhance resolution which I don't want to): is it possible to set interval to .5 (30 seconds) to poll the counters even more often and be able to see the whole workaround this completely ? 
I read & tried everything possible now, maybe somebody can only acknowlegede "interval" helps me out. (or tell me it's impossible, then I'll go to 3Com and tell them to have a deeper look on rfc2233.

Michael

-----Original Message-----
From: Michael Markstaller 
Sent: Tuesday, May 27, 2003 11:33 AM
To: giochi at telvia.it; mrtg at list.ee.ethz.ch
Subject: [mrtg] Re: Mrtg for monitoring CPU and disk space


you should be a little more specific, what type of box are you talking about. then look on the mrtg-page and search the archives:
http://www.google.de/search?num=100&hl=de&ie=ISO-8859-1&q=cpu+disk+%22+site%3Awww.ee.ethz.ch&meta=
or search for hrStorage and hrProcessorload in case your box supports HOST-RESOURCE-MIB

Michael

-----Original Message-----
From: giochi at telvia.it [mailto:giochi at telvia.it]
Sent: Tuesday, May 27, 2003 10:29 AM
To: mrtg at list.ee.ethz.ch
Subject: [mrtg] Mrtg for monitoring CPU and disk space


Hi alls,

I would like to know how to monitoring cpu and disk space because I have
installaed mrtg but I see only the graph of eth0 and eth1.

Probabily I must add something to the snmpd configuration.

Could someone help me ?

Thanks in advance.


Fabrizio

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