2 - check superblock checksum in examine
3 - report "chunk" or "rounding" depending on raid level
4 - report "linear" instead of "-1" for raid level DONE
5 - decode ayout depending on raid level DONE
6 - get Assemble to upgrade devices if force flag.
7 - --verbose and --force flags.
9 - set md_minor, *_disks for Create
10 - for create raid5, how to choose between
11 all working, but not insync
12 one missing, one spare, insync