I have a machine with 3 identical disks, thus I'd like to install it with a raid5 mdadm configuration. What should I do for the /boot and /boot/uefi partitions ? For them I tried to use raid1 with 3 disks configuration, evrything seemed to work right until the installer tried to install grub. I got the message that grub-install dummy did not work. What should I do for this ? Thank you