[Bug 1466150] Re: grub-install breaks when ESP is on raid

[Jack Ostroff]

I'm beginning to thing the problem is simply that the EFI System
Partition really does need to be a real partition, and not a logical
volume or part of a raid.  It is not an issue with raid and fat32, it is
just that the ESP (/boot/efi) needs to be reached from the EFI firmware,
which doesn't know about anything except real GPT partitions.  I'd
really love to find otherwise, but that seems to be the conclusion of
all my searching.  Grub can boot to a kernel and initramfs on a logical
or raid volume, but it seems that grubx64.efi (for example) needs to be
on a physical partition.

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https://bugs.launchpad.net/bugs/1466150

Title:
  grub-install breaks when ESP is on raid

Status in grub-installer package in Ubuntu:
  Triaged

Bug description:
  I run a server with mirrored (RAID1) disks using grub-efi.

  Root and /boot and /boot/grub are on mirrored partitions.

  I have EFI partitions on both disks but it is not possible to RAID1
  these as they are FAT32.  On an EFI system grub-install will only
  install to one of the EFI partitions and so after running install-grub
  you have to remember to copy the EFI file across.

  Could grub configuration and grub-install be amended to automatically
  install to multiple disks?

  Searching around there seem to be many people asking this question
  without any elegant solution.

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