[mrtg] Help reading the OIDs for a Emerson/Libert unit

Anson Rinesmith arinesmith at bigrivertelephone.com
Tue Apr 8 17:13:29 CEST 2008

Why in the config are you using
and when using snmpget using
Wouldn't it make more sense to use the full OID that you know returns the
correct value?>

From: mrtg-bounces at lists.oetiker.ch [mailto:mrtg-bounces at lists.oetiker.ch]
On Behalf Of Mills, Charles
Sent: Tuesday, April 08, 2008 9:41 AM
To: mrtg at lists.oetiker.ch
Subject: [mrtg] Help reading the OIDs for a Emerson/Libert unit

Hi all 
 I’m kind of at my wit’s end with this problem and not sure what I’m
doing wrong in the MRTG side of things.  I don’t do a lot of “custom” cfg
files relying mainly on the cfgmaker.

I have a Liebert 22 Ton CRAC unit in my data center and I’d like to use it
as a temp sensor for that part of the computer room.  I believe I have the
correct OID but MRTG doesn’t seem to evaluate/expand it right or I have
something else wrong in the config file:

Running the MRTG program yields:

env LANG=C /usr/local/mrtg-2/bin/mrtg /etc/mrtg/Liebert-AC-4-temp.cfg
2008-04-08 10:31:28: ERROR: Target[liebert-ac-4][_IN_]
'. $target->[0]{$mode} ' evaluated to
'Ç*19773129' instead of a number
2008-04-08 10:31:28: ERROR: Target[liebert-ac-4][_OUT_]
'. $target->[0]{$mode} ' evaluated to
'Ç*38089656' instead of a number

./snmpget.pl -c 'RO-snmp-string’ <ip of liebert webcard>


. = INTEGER: 73

Persuing the docs didn’t yield too much that would point me in the right
if anyone has ever tackled something like this I’d appreciate the


Charles L. Mills
Senior Network Engineer
Access Data Corporation / Pittsburgh, PA 15238
(412) 968-4024 FAX: (412) 967-9504
cmills at accessdc.com / http://www.accessdc.com
Hosting, Colocation, D-R and Managed Services

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