I just ran into this after, over a period of two days, trying to figure out why D-I / partman doesn't allow me to partition /dev/md0, and why it would not even recognize a manual partitioning created via `cfdisk`. I think it would be very useful if partman supported partitionable md devices. It would save you from having to configure, and in case of failure, rebuild, several individual (classic, non-partitionable) md arrays. (Also, using LVM on top of a single big md device as a substitute for partitioning isn't really an option because LVM doesn't support write barriers.) Let me know if I can help with this -- anything short of providing a patch, given that I have absolutely no clue of the partman internals. -Julian
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