[rrd-users] rrdtool xport ignoring --step

[Patrick Joy]

Hi,

Would appreciate some help with the following issue.

I have a script configured to read data from 8 different temperature 
sensors and feed them to rrdtool every 60 seconds. My rrd file is 
configured with an rra to keep this data for one week.

rrdtool create temperatures.rrd --start N --step 60 \
DS:Outside:GAUGE:120:-10:90 ...............
RRA:AVERAGE:0.5:1:20160 ..............

When I export 24 hours of data I get the expected result with one 
reading every 60 seconds (note the step=60 in the xml output)

rrdtool xport -s now-4h -e now --step 60  \
DEF:a=/var/www/temp/data/temperatures.rrd:Outside:AVERAGE..................
XPORT:a:"Outside" ............... > /var/www/temp/data/temperature4h.xml

<?xml version="1.0" encoding="ISO-8859-1"?>

<xport>
   <meta>
     <start>1370146380</start>
     <step>60</step>
     <end>1370146380</end>
     <rows>239</rows>
     <columns>8</columns>

However when I export 24 hours worth of data the step is changed to 300 
even though I specified 60 at the command line.

rrdtool xport -s now-24h -e now --step 60  \
DEF:a=/var/www/temp/data/temperatures.rrd:Outside:AVERAGE ............
XPORT:a:"Outside" ................  > /var/www/temp/data/temperature24h.xml


<?xml version="1.0" encoding="ISO-8859-1"?>

<xport>
   <meta>
     <start>1370074500</start>
     <step>300</step>
     <end>1370074500</end>
     <rows>289</rows>
     <columns>8</columns>
     <legend>


Any ideas?

Thanks