[rrd-users] newbie: How to read RRDDUMP

[John-Paul Delaney]

Hello List...

The following dump fragment example of an RRA (for MAX 2hr values) has me 
confused (easily done!).  What are the two

 <v> values </v>

for each row?  I would expect one MAX value for that 2 hour period - 
please tell me my mistake.

And what does the <cdp_prep> stand for?

I've tried searching for this but only come up with the man page for 
rrddump which doesn't appear to go into such detail.

Thanks for your help

/j-p.


=====================================================
        <rra>
                <cf> MAX </cf>
                <pdp_per_row> 24 </pdp_per_row> <!-- 7200 seconds -->
                <xff> 5.0000000000e-01 </xff>

                <cdp_prep>
<ds><value> 8.2241484292e+02 </value>  <unknown_datapoints> 0 
</unknown_datapoints></ds>
<ds><value> 2.8292849921e+02 </value>  <unknown_datapoints> 0 
</unknown_datapoints></ds>
                </cdp_prep>
                <database>
<!-- 2003-01-09 11:00:00 GMT+1 / 1042113600 --> <row><v> 3.2838913314e+03 
</v><v> 2.8172668424e+03 </v></row>
<!-- 2003-01-09 13:00:00 GMT+1 / 1042120800 --> <row><v> 2.5326807936e+03 
</v><v> 2.9125726246e+03 </v></row>
======================================================

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