ReaR recovery fail in a multipath system

Issue

• When recovering a PPC64+multipath system, the following error message is seen when executing rear -v recover:

  Installing for powerpc-ieee1275 platform.
  ofpathname: Could not retrieve Open Firmware device path for logical device "/dev/mapper/mpathf".
  Installation finished. No error reported.
  2021-06-04 13:42:33.207523277 GRUB2 installed on /dev/mapper/mpathf1