[rrd-users] rrdtool xport - getting total bandwidth for a specific date interval

[Göran Törnqvist]

Hello,
I got a bunch of RRA files and I want to get the total bandwidth from them for a specific date interval for accounting purposes.
Im using cacti to generate the graphs so Im not too good at RRDTOOL Im afraid (sorry) and couldnt find a solution to this.
I´ve managed to get data from a rrd-file like this: 
rrdtool xport --start now-24h --end now DEF:out=rra/switch_traffic_in_28.rrd:traffic_out:MAX XPORT:out:"out bytes" 
. 

I get a XML file that looks like this: 


      Code: 

      <?xml version="1.0" encoding="ISO-8859-1"?> 
      <xport> 
        <meta> 
          <start>1116057600</start> 
          <step>7200</step> 
          <end>1118656800</end> 
          <rows>362</rows> 
          <columns>1</columns> 
          <legend> 
            <entry>out bytes</entry> 
          </legend> 
        </meta> 
        <data> 
          <row><t>1116057600</t><v>1.3456063333e+04</v></row> 
          <row><t>1116064800</t><v>1.7400663333e+04</v></row> 
          <row><t>1116072000</t><v>1.5801985689e+04</v></row> 
          <row><t>1116079200</t><v>1.4365490467e+04</v></row> 
          <row><t>1118656800</t><v>NaN</v></row> 
        </data> 
      </xport> 
     



I have trouble with interpreting the XML-output, whats <t> and whats <v>, what does 1.3456063333e+04 mean?  I can't find any info on how the data should be parsed. I guess I should loop all rows but after that Im stuck, should I add the numbers somehow?

Thanks for your time...and thanks for any help :)

Best Regards
Goran Tornqvist
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