How to convert single disk EFI boot to software RAID after installation

Solution Verified - Updated -

Issue

  • Need to convert a non-raided EFI root disk to RAID1 mirror after installation of Red Hat Enterprise Linux 7.

Environment

  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • EFI
  • Logical Volume Manager (LVM)
  • Software RAID (mdadm)

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