If you have created a correct GPT then kpartx should find them.

Does dmraid detect the correct RAID layout?
Ie stride size, count, etc.

You need to investigate the partitioning on the disk, you need to make
sure your data is backup up as you are likely to loose partitioning
here.

Dump the current GPT to a file (First 17kB of array in total I think)
and then recreate the GPT using gparted or gdisk creating the same
partition layout and dump it again.

Take a look at the files and try to analyse the GPT, also post both
files here.

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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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