This bitmap is used for two optimisations.
-Firstly, after an unclear shutdown, the resync process will consult
+Firstly, after an unclean shutdown, the resync process will consult
the bitmap and only resync those blocks that correspond to bits in the
-bitmap that are set. This can dramatically increase resync time.
+bitmap that are set. This can dramatically reduce resync time.
Secondly, when a drive fails and is removed from the array, md stops
clearing bits in the intent log. If that same drive is re-added to