Hello All,
I wonder if anyone can offer any insight...
I am polling around 1000 devices on a dual Xeon system running Linux
(2.4.18-14smp). This is split into 40 separate mrtg configuration files
that run concurrently using RRD as the logging format. I have a web
frontend using read-only NFS to mount the generated rrds on a similar spec
system from which I use a heavily customised version of mrtg-rrd.cgi to
display the data. (Actually, if anyone's interested, using FastCGI
(www.fastcgi.com) with mrtg-rrd.cgi increases the speed of image creation by
a factor of 20!). Each MRTG process is set to fork 16 times. The mrtg
config is automatically generated from a database holding all of the config
data for all of the Edge devices (using /bin/sh shell scripts). There's all
sorts of error-checking built-in for the consistency of the data, to ensure
the right processes are running and every 24 hours it actively checks the
config of the edge devices. I'm using mrtg-2.9.29 and rrdtool-1.0.43.
It all works beautifully.
Except:
Some devices just do not display data when polled with MRTG, yet when I try
to snmpwalk (or get, or getnext) using the correct community / target IP and
port with both SNMPv1 and v2c (ifInOctets & ifHCInOctets) from the data
collection system I get a valid response every time.
I've tried using SNMPv1 and v2c (by appending :::::2 to the target).
I have tried reducing the forking and increasing the SNMP timeout and
retries (to 5 and 3 respectively) and managed to get a single point of data
on one of the missing graphs but that's all.
The weird thing is the consistency of the problem:
It doesn't work 99% of the time with MRTG.
It works every time with command line snmp tools...
>From the mrtg output:
2003-08-05 16:09:35 -- WARNING: skipping because at least the query for
ifDescr.24 on X.X.X.X did not succeed
2003-08-05 16:09:35 -- WARNING: no data for
ifInOctets&ifOutOctets:[EMAIL PROTECTED] Skipping further queries for Host
X.X.X.X in this round.
2003-08-05 16:09:35 -- ERROR: Target[X.X.X.X_PORT][_IN_] '
$$target[13]{$mode} ' evaluated to 'DEADHOST' instead of a number
2003-08-05 16:09:35 -- ERROR: Target[X.X.X.X_PORT][_OUT_] '
$$target[13]{$mode} ' did not eval into defined data
Packet Loss? Bug in 2.9.29? (Sorry, Tobi)
Thanks in advance for any ideas.
Kind Regards
SM
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