From the description, I understand this problem is specific to installation in PowerVM mode (PReP boot configuration) with multipath root disk. Is that correct?
grub-installer will configure a PReP partition when not running in PowerVM mode, and will equally fail to configure the path when the root disk is on a multipath device, but the failure would not affect the system's bootability after install when booting in PowerNV mode.
From the description, I understand this problem is specific to installation in PowerVM mode (PReP boot configuration) with multipath root disk. Is that correct?
grub-installer will configure a PReP partition when not running in PowerVM mode, and will equally fail to configure the path when the root disk is on a multipath device, but the failure would not affect the system's bootability after install when booting in PowerNV mode.