[rrd-users] Re: another guy getting NaNs

Wed Nov 29 19:17:26 MET 2006

On Wednesday 29 November 2006 11:51, Alex van den Bogaerdt wrote:
> On Wed, Nov 29, 2006 at 11:10:20AM -0500, Lincoln Rutledge wrote:
> > I apologize, I know you have been very helpful on this list.  I think you
> > are trying to lead me toward solving my problem :)  I'm just not sure
> > what you are trying to get me to do.
>
> What I am trying to get you to do, is to create an example that
> is clear, no room for misinterpretations.
>
> If I (or anyone else for that matter) run the script, the result
> should show what you try to describe in words.
>
> If we run the script another time, the result should be _exactly_
> the same.
>
> The only reason why results may differ, is if a different rrdtool
> version would do something different to your input.
>
> You then say why you think the output is wrong, what it should be,
> and I (or anyone else) can comment on this.  Perhaps you are right,
> perhaps you found a bug.  Or perhaps you don't understand what is
> happening, and you'll be told where you go wrong.
Hehe, okay.

I have no illusions about having found a bug in the software, only in my 
perception capability.

I've been running such a test, to help me examine rrdtool's habits.  I have in 
fact been successful in putting data in an rrd.

I guess the next step then is to back through my project and move one step at 
a time.

For my successful test, here is the create command:
rrdtool create test.rrd -s 3600 RRA:AVERAGE:.99999:1:24 
DS:octets:GAUGE:4000:U:U

Then in crontab:
55 * * * * /usr/local/bin/rrdtool update test.rrd -t octets N:12345

If I do a dump:
<!-- Round Robin Database Dump --><rrd> <version> 0003 </version>
        <step> 3600 </step> <!-- Seconds -->
        <lastupdate> 1164822900 </lastupdate> <!-- 2006-11-29 12:55:00 EST -->

        <ds>
                <name> octets </name>
                <type> GAUGE </type>
                <minimal_heartbeat> 4000 </minimal_heartbeat>
                <min> NaN </min>
                <max> NaN </max>

                <!-- PDP Status -->
                <last_ds> UNKN </last_ds>
                <value> 4.0745927690e+07 </value>
                <unknown_sec> 0 </unknown_sec>
        </ds>

<!-- Round Robin Archives -->   <rra>
                <cf> AVERAGE </cf>
                <pdp_per_row> 1 </pdp_per_row> <!-- 3600 seconds -->

                <params>
                <xff> 9.9999000000e-01 </xff>
                </params>
                <cdp_prep>
                        <ds>
                        <primary_value> 1.2345000000e+04 </primary_value>
                        <secondary_value> 0.0000000000e+00 </secondary_value>
                        <value> NaN </value>
                        <unknown_datapoints> 0 </unknown_datapoints>
                        </ds>
                </cdp_prep>
                <database>
                        <!-- 2006-11-28 13:00:00 EST / 1164736800 --> <row><v> 
NaN </v></row>
                        <!-- 2006-11-28 14:00:00 EST / 1164740400 --> <row><v> 
NaN </v></row>
                        <!-- 2006-11-28 15:00:00 EST / 1164744000 --> <row><v> 
NaN </v></row>
                        <!-- 2006-11-28 16:00:00 EST / 1164747600 --> <row><v> 
NaN </v></row>
                        <!-- 2006-11-28 17:00:00 EST / 1164751200 --> <row><v> 
NaN </v></row>
                        <!-- 2006-11-28 18:00:00 EST / 1164754800 --> <row><v> 
NaN </v></row>
                        <!-- 2006-11-28 19:00:00 EST / 1164758400 --> <row><v> 
NaN </v></row>
                        <!-- 2006-11-28 20:00:00 EST / 1164762000 --> <row><v> 
NaN </v></row>
                        <!-- 2006-11-28 21:00:00 EST / 1164765600 --> <row><v> 
NaN </v></row>
                        <!-- 2006-11-28 22:00:00 EST / 1164769200 --> <row><v> 
NaN </v></row>
                        <!-- 2006-11-28 23:00:00 EST / 1164772800 --> <row><v> 
NaN </v></row>
                        <!-- 2006-11-29 00:00:00 EST / 1164776400 --> <row><v> 
NaN </v></row>
                        <!-- 2006-11-29 01:00:00 EST / 1164780000 --> <row><v> 
NaN </v></row>
                        <!-- 2006-11-29 02:00:00 EST / 1164783600 --> <row><v> 
NaN </v></row>
                        <!-- 2006-11-29 03:00:00 EST / 1164787200 --> <row><v> 
NaN </v></row>
                        <!-- 2006-11-29 04:00:00 EST / 1164790800 --> <row><v> 
NaN </v></row>
                        <!-- 2006-11-29 05:00:00 EST / 1164794400 --> <row><v> 
NaN </v></row>
                        <!-- 2006-11-29 06:00:00 EST / 1164798000 --> <row><v> 
NaN </v></row>
                        <!-- 2006-11-29 07:00:00 EST / 1164801600 --> <row><v> 
NaN </v></row>
                        <!-- 2006-11-29 08:00:00 EST / 1164805200 --> <row><v> 
NaN </v></row>
                        <!-- 2006-11-29 09:00:00 EST / 1164808800 --> <row><v> 
NaN </v></row>
                        <!-- 2006-11-29 10:00:00 EST / 1164812400 --> <row><v> 
1.2345000000e+04 </v></row>
                        <!-- 2006-11-29 11:00:00 EST / 1164816000 --> <row><v> 
1.2345000000e+04 </v></row>
                        <!-- 2006-11-29 12:00:00 EST / 1164819600 --> <row><v> 
1.2345000000e+04 </v></row>
                </database>
        </rra>
</rrd>

-- 
Lincoln Rutledge
Network Engineer
OARnet
614-292-7779 www.oar.net

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