[rrd-developers] Spikes in RRD after a dead zone

[mboldi at shore.net]

Hi Tobias,
I am noting some spikes that shouldn't be.  I am collecting in & out octets
on many network devices, and occasionally my polling routine cannot
hit a device.  When the connection is resestablished, I get spikes that
are just under the max I set for the RRD database.  However, seems
to me that RRD should recognize this 1st observation (after the the
series of Unknown reading) as a special case and not record these spikes.
Seems that RRD is reporting in the one interval, all traffic that was
incurred over the entire "Unknown" interval.

Is there a setting I have missed ?


example


<!-- Round Robin Database Dump -->
<rrd>
        <version> 0001 </version>
        <step> 300 </step> <!-- Seconds -->
        <lastupdate> 951493928 </lastupdate> <!-- 2000-02-25 10:52:08 EST -->

        <ds>
                <name> ifInOctets </name>
                <type> COUNTER </type>
                <minimal_heartbeat> 600 </minimal_heartbeat>
                <min> 0.0000000000e+00 </min>
                <max> 4.0540500000e+08 </max>


<!-- 2000-02-24 16:10:00 EST --> <row><v> 1.7180658534e+05 </v><v> 3.3976507158e+04 </v></row>
<!-- 2000-02-24 16:15:00 EST --> <row><v> NaN </v><v> NaN </v></row>
<!-- 2000-02-24 16:20:00 EST --> <row><v> NaN </v><v> NaN </v></row>
<!-- 2000-02-24 16:25:00 EST --> <row><v> NaN </v><v> NaN </v></row>
<!-- 2000-02-24 16:30:00 EST --> <row><v> NaN </v><v> NaN </v></row>
<!-- 2000-02-24 16:35:00 EST --> <row><v> NaN </v><v> NaN </v></row>
<!-- 2000-02-24 16:40:00 EST --> <row><v> NaN </v><v> NaN </v></row>
<!-- 2000-02-24 16:45:00 EST --> <row><v> NaN </v><v> NaN </v></row>
<!-- 2000-02-24 16:50:00 EST --> <row><v> NaN </v><v> NaN </v></row>
<!-- 2000-02-24 16:55:00 EST --> <row><v> 8.5213396119e+07 </v><v> 4.2545913160e+07 </v></row>
<!-- 2000-02-24 17:00:00 EST --> <row><v> 1.8505596422e+05 </v><v> 2.4762237483e+04 </v></row>




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