On 12/24/21 06:38, cen wrote:
# remove raid metadata
mdadm --zero-superblock /dev/sdd1
Assuming the new disk hasn't been used, that step is probably unnecessary.
# install bootloader on new disk
grub2-install /dev/sdd1
That looks wrong, it should probably be 'grub2-install /dev/sdd'.
Additionally, it should be performed *after* adding the replacement disk
to the RAID set, not before.
(Note that this step is not required and should not be performed on UEFI
systems, only BIOS.)