17.5. Converting Root Disk to RAID1 after Installation

If you need to convert a non-raided root disk to a RAID1 mirror after installing Red Hat Enterprise Linux 7, see the instructions in the following Red Hat Knowledgebase article: How do I convert my root disk to RAID1 after installation of Red Hat Enterprise Linux 7?
On the PowerPC (PPC) architecture, take the following additional steps:
  1. Copy the contents of the PowerPC Reference Platform (PReP) boot partition from /dev/sda1 to /dev/sdb1:
    # dd if=/dev/sda1 of=/dev/sdb1
  2. Update the Prep and boot flag on the first partition on both disks:
    $ parted /dev/sda set 1 prep on
    $ parted /dev/sda set 1 boot on
    $ parted /dev/sdb set 1 prep on
    $ parted /dev/sdb set 1 boot on
Note that running the grub2-install /dev/sda command does not work on a PowerPC machine and returns an error, but the system boots as expected.