Creating Software RAID arrays on Debian systems:

  * apt-get install mdadm
  * fdisk and create partitions type 0xfd
  * mdadm --zero-superblock /dev/hda /dev/hdc
  * mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/hd["ac"]1
  * mkfs.ext3 /dev/md0 
  *add entry to fstab

/dev/md0 /home ext3 noatime,rw 0 0

  * Create mdadm config file:

panther:~# cat /etc/mdadm/mdadm.conf

 ARRAY /dev/md0 devices=/dev/hda1,/dev/hdc1 level=1 num-devices=2 auto=yes
 DEVICE /dev/hda1 /dev/hdc1

Note that the array is actually started in /etc/rc0.d/S50mdadm (via mdadm -A -s) or mdrun command