[mrtg] Problem with nulls in RRD files

[Mersberger, Robert]

Thanks for getting back with me even though I did not follow the proper
protocol.
I checked the 3 items you have listed below and they seem correct to me
as follows.
1. community string is correct and there are no error when I run from
the command line.
2. the .cfg files has maxbytes set correctly and I don't use AbsMax
3.  it looks like rrd is still getting nulls: see below.   what is
unknown_sec
[root at mrtg2 ~]# rrdtool dump /usr/local/rrd_data/10.4.38.254_fa0_0.rrd
|more
<!-- Round Robin Database Dump --><rrd> <version> 0003 </version>
        <step> 300 </step> <!-- Seconds -->
        <lastupdate> 1213713084 </lastupdate> <!-- 2008-06-17 09:31:24
CDT -->
 
        <ds>
                <name> ds0 </name>
                <type> COUNTER </type>
                <minimal_heartbeat> 600 </minimal_heartbeat>
                <min> 0.0000000000e+00 </min>
                <max> 1.2500000000e+07 </max>
 
                <!-- PDP Status -->
                <last_ds> 106725109559 </last_ds>
                <value> NaN </value>
                <unknown_sec> 84 </unknown_sec>
        </ds>
 
        <ds>
                <name> ds1 </name>
                <type> COUNTER </type>
                <minimal_heartbeat> 600 </minimal_heartbeat>
                <min> 0.0000000000e+00 </min>
                <max> 1.2500000000e+07 </max>
 
                <!-- PDP Status -->
                <last_ds> 170907938619 </last_ds>
                <value> NaN </value>
                <unknown_sec> 84 </unknown_sec>
        </ds>
 
<!-- Round Robin Archives -->   <rra>
                <cf> AVERAGE </cf>
                <pdp_per_row> 1 </pdp_per_row> <!-- 300 seconds -->
 
                <params>
                <xff> 5.0000000000e-01 </xff>
                </params>
                <cdp_prep>
                        <ds>
                        <primary_value> NaN </primary_value>
                        <secondary_value> NaN </secondary_value>
                        <value> NaN </value>
                        <unknown_datapoints> 0 </unknown_datapoints>
                        </ds>
                        <ds>
                        <primary_value> NaN </primary_value>
                        <secondary_value> NaN </secondary_value>
                        <value> NaN </value>
                        <unknown_datapoints> 0 </unknown_datapoints>
                        </ds>

________________________________

From: Steve Shipway [mailto:s.shipway at auckland.ac.nz] 
Sent: Monday, June 16, 2008 5:27 PM
To: Mersberger, Robert; 'mrtg at lists.oetiker.ch'
Subject: Re: Problem with nulls in RRD files



If you can see the date and time on the .rrd files changing regularly,
then this confirms that MRTG is running, and updating the RRD files.
Therefore, the problem is that nulls are being stored.

 

If nulls are being stored, there are a few possible causes:

 

1) The data really is null.  Maybe the device being monitored is down or
unreachable, or your community string is wrong.  Check the output of
MRTG when run interactively to look for error messages.

2) The data is out of bounds.  If you have MaxBytes or AbsMax set to a
too-low value, then retrieved data may be seen as too large and so a
null is stored.

3) When you do an rrdtool dump, look at the beginning for the PDP
Status.  See what 'value' and 'unknown_sec' are, these show the last
values retrieved.

 

BTW - try starting a new thread in the mailing list for a new question.
Also, there are MRTG/RRD/Routers2 support forums (fora?) available on
http://www.steveshipway.org/forum

 

Steve

 

________________________________

From: Mersberger, Robert [mailto:robert.mersberger at goldenliving.com] 
Sent: Tuesday, 17 June 2008 10:13
To: Steve Shipway; Eric Hernandez; mrtg at lists.oetiker.ch
Subject: RE: [mrtg] graphing more than two values with mrtg/rrdtool

 

maybe this is not the place to ask this but, I need help.

 

I have just installed mrtg, rrdtool and rouers2.cgi on a fedora fc9  and
seem to have all things functioning correctly except for updating the
rrd_data files for the site I am polling.

If I do an ls -al of the rrd_data directory I can watch the date and
time change with each run of my mrtg script.  if I dump one of the rrds
I only seen nulls,

 

Can anyone help me this this?

 

 

 



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