Now use sfdisk to duplicate partitions from old drive to new drive:
#sfdisk -d /dev/sda | sfdisk /dev/sdb
Now use mdadm to create the raid arrays. We mark the first drive (sda) as "missing" so it doesn't wipe out our existing data:
#mdadm --create /dev/md0 --level 1 --raid-devices=2 missing /dev/sdb1
Now copy the remaining partitions. Be careful to match your md devices with your filesystem layout. This example is for my particular setup
mount /dev/md1 /mnt/var
cp -dpRx /var /mnt
... repeat for remaining folder.
Setting fstab, grub to boot from mdX
Reboot
At this point, you have all of your original data on the new drive, so we can safely add the original drive to the raid volume.
mdadm --add /dev/md0 /dev/sda1
mdadm --add /dev/md1 /dev/sda2
... repeat for remaining partitions.
Thanks to :
http://www.debian-administration.org/articles/238
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