Ok, I think I am starting to see now.  This PDC format is just really
bad.  Instead of having a single record that can define more than one
array, and specifies the region of interest on each component disk like
some of the more sane formats, it just defines additional complete
records with all of the unused space that each one has, and raid.start
defines the starting offset of the array, for all disks ( so they all
start at exactly the same spot ).  dmraid-pdc.tar appears to have been
created by dmraid but it only dumped the first record.  Your script
dumped all 3 and they appear to be in metadata.tar.gz, but without the
corresponding .offset files.  I can't work out the original locations of
each of the 3 records so that I can place them at the proper offset.

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https://bugs.launchpad.net/bugs/599255

Title:
  dmraid fails to read promise RAID sector count larger than 32-bits

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