# create a raid0, re-assemble with a different super-minor mdadm -CR -e 0.90 $md0 -l0 -n3 $dev0 $dev1 $dev2 testdev $md0 3 $mdsize0 512 minor1=`mdadm -E $dev0 | sed -n -e 's/.*Preferred Minor : //p'` mdadm -S /dev/md0 mdadm -A $md1 $dev0 $dev1 $dev2 minor2=`mdadm -E $dev0 | sed -n -e 's/.*Preferred Minor : //p'` mdadm -S /dev/md1 mdadm -A $md1 --update=super-minor $dev0 $dev1 $dev2 minor3=`mdadm -E $dev0 | sed -n -e 's/.*Preferred Minor : //p'` mdadm -S /dev/md1 case "$minor1 $minor2 $minor3" in "0 0 1" ) ;; * ) echo >&2 "ERROR minors should be '0 0 1' but are '$minor1 $minor2 $minor3'" exit 1 esac