To fix it, you need to convert on your 32bits machine the .rrd file to xml files.

    for i in `ls *.rrd`; do rrdtool dump $i > $i.xml; done

And on your 64bits machine, transform your XML files to rrd files :

for i in `ls *.xml`; do rrdtool restore $i `echo $i |sed s/.xml//g`; done

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