[rrd-users] Question

[Marek Dąbrowski]

Hello

I need one explanation. I create rrd with that settings: step=300 
heartbeat=300
DS:test:ABSOLUTE:300:U:U RRA:LAST:0.5:1:600 .
When I try insert one value for actuall date, after dump this value is NaN.
rrdtool update 1.rrd 1090415400:1
<!-- 2004-07-21 15:10:00 CEST / 1090415400 --> <row><v> NaN </v></row>

But when I insert:
rrdtool update 1.rrd 1090415400:1
rrdtool update 1.rrd 1090415700:1

<!-- 2004-07-21 15:10:00 CEST / 1090415400 --> <row><v> NaN </v></row>
<!-- 2004-07-21 15:15:00 CEST / 1090415700 --> <row><v> 3.3333333333e-03 
</v></row>

and further for exmaple

rrdtool update 1.rrd 1090416600:1
<!-- 2004-07-21 15:30:00 CEST / 1090416600 --> <row><v> NaN </v></row>

NaN again.

Where is first value?
Could you explain me what is wrong? Why values that have before and 
after oneslf NaN, are NaN too?

Regards
Marek

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