grub2-install failed with the error message 'error: unknown filesystem' with /boot partition formatted with xfs during backup recovery with rear

Solution Verified - Updated -

Issue

  • rear recover doesn't work from Red Hat Enterprise Linux 7.3.
  • rear mkbackup looks working well, but rear recover in the rescue image failed with the following error when XFS is used for /boot.
    grub2-install: error: unknown filesystem.

Environment

  • Red Hat Enterprise Linux 7.3
    • rear

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