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Why on Earth would you do this? Creating an md device with intentional unfixable errors precludes successful array rebuilds, and in the bigger picture, fixating on hacks like this goes against the flow of data integrity, and tunnel vision leads to accidents. You mentioned, "I want to do this right", so you really should be using the decade-long established solution, ZFS.
– Deltik
Commented Aug 9, 2018 at 15:16

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