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The current MD driver does not pass FITRIM (trim/discard) commands down to the underlying devices, so a mirror or raid of SSDs cannot be trimmed with offline tools such as "fstrim" (and I presume online trim, i.e. mount -o discard probably won't work either).

dm was fixed a while ago, it seems that md should handle this too.

-Eric

*** This bug has been marked as a duplicate of bug 714644 ***