Notes Hard drives are sda and sdb, if you have an IDE drives, replace it with hda and hdb Drive sda is up and running, adding new drive sdb Swap partition will not be RAIDed Change Partition Type of the Old Drive to RAID sfdisk --change-id /dev/sda 1 fd sfdisk --change-id /dev/sda 2 fd Copy Partition table to the New Drive  sfdisk -d /dev/sda | sfdisk /dev/sdb Create swap on the New Drive  mkswap /dev/sdb3 Create Raid and add New Drive  mdadm --create /dev/md1 --level=1 --raid-devices=2 missing /dev/sdb1 mdadm --create /dev/md2 --level=1 --raid-devices=2 missing /dev/sdb2 Format RAID  mke2fs -j /dev/md1 mke2fs -j /dev/md2 Modify Kernel mkinitrd -f /boot/initrd-`uname -r`.img `uname -r` Change Drives Edit /etc/fstab Change LABEL=/ to /dev/md2 Change LABEL=/boot to /dev/md1 Edit /boot/grub/menu.lst Change LABEL=/ to /dev/md2 Copy files to new drive mkdir /mnt/tmp mount /dev/md1 /mnt/tmp cp -axu /boot/* /mnt/tmp sync umount /dev/md1 mount /dev/md2 /mnt/tmp cp -axu / /mnt/tmp Reboot Add old drive to Raid Array Add old Drive mdadm /dev/md1 --add /dev/sda1 mdadm /dev/md2 --add /dev/sda2 Monitor build status watch -n 1 cat /proc/mdstat Create stage 1 grub on sdb grub root (hd0,0) setup (hd0) root (hd1,0) setup (hd1) quit Clean up rm -vfR /mnt/tmp Reboot Useful RAID command