How do I clone a linux software raid drive BE CAREFUL BEFORE MESSING WITH sfdisk! MAKE SURE YOU KNOW WHAT YOU'RE DOING! sfdisk -d /dev/sda | /dev/sdc If above doesn't work, try with sdb sfdisk -d /dev/sda > sda.out sfdisk /dev/sda < sda.out cat /proc/mdstat mdadm /dev/md0 --add /dev/sda6 For instance mdadm /dev/md1 --add /dev/sdc1 // boot mdadm /dev/md0 --add /dev/sdc2 // big sfdisk -l If you want the second disk to boot, you need to deal with grub. Use grub-install /dev/sda, /dev/sdb etc or else following dependent on ide/hda,hdb, etc grub > device (hd0) /dev/hda > root (hd0,0) > setup (hd0) > device (hd1) /dev/hdc > root (hd1,0) > setup (hd1) for testing raidsetfaulty /dev/md1 /dev/sdc2 |