#
#
# http://www.byte.com/documents/s=331/byt20000329s0001/index4.htm
#
#
mdadd /dev/md0 /dev/sda1 /dev/sdc1 || {
  ckraid --fix /etc/raid.usr.conf
  mdadd /dev/md0 /dev/hda1 /dev/hdc1
}

         or 

mdrun -p1 /dev/md0
if [ $? -gt 0 ] ; then
  ckraid --fix /etc/raid1.conf
  mdrun -p1 /dev/md0
fi
#
# end of file