DEVICES="/dev/sda /dev/sdb"
RAIDLEVEL=1
mdadm --detail /dev/md* | grep imsm >& /dev/null && exit 0
lvm vgchange -a n
mdadm -S -s
NUMDEVS=$(for dev in $DEVICES; do
   echo wipefs -a $dev
done|wc -l)
for dev in $DEVICES; do
   wipefs -a $dev
done
mdadm -C /dev/md/imsm0 $DEVICES -n $NUMDEVS -e imsm
mdadm -C /dev/md/md0_0 /dev/md/imsm0 -n $NUMDEVS -l $RAIDLEVEL
mdadm -S -s
mdadm --assemble --scan