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

[John Robinson]

Yes Jack it does. That's why you can use a "trick" with md raid 1 with
metadata 0.90 or 1.0, because those both result in having two (or more)
discs with ESP partitions which are readable and bootable by the EFI
BIOS.

This bug thread is more about making grub-install call efibootmgr
correctly to install two (or more) EFI boot entries for each of the ESP
partition mirrors, than anything else.

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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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