quoted
How did you copy the super block.
Not sure what you mean there? Which superblock?
I mean did you use some tool like Ghost(database backup software).
quoted
did you run fsck after booting you could set up that.
http://www.cyberciti.biz/faq/linux-force-fsck-on-the-next-reboot-or-boot-seque
nce/
Not sure why this will be helpful? There's not an independent file system on
each md device is there?
Even an single filesytem requires you sync the upgrades or down grades.