This is a very severe data corrupting bug.

Thus, even if the the md devs can not fix the "bio" abstraction or
whatever would be necessary to support mixed interface setups, the md
module should definitely have a safeguard and make sure to return a
failure on hot add/remove under these circumstances, instead of letting
this bug eat it's user's data.

** Changed in: mdadm (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/320638

Title:
  hot-add/remove in mixed (HDD/USB/SD-card/...)  RAIDs -> data
  corruption (bio too big device md0 (248 > 200))

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