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

[Georg Sauthoff]

Tom Reynolds (tomreyn) wrote (https://bugs.launchpad.net/ubuntu/+source
/grub-installer/+bug/1466150/comments/28):

> While installing ESP on top of mdadm (metadata version <= 1.0) RAID-1
is practically possible, supporting this is not: The UEFI specification
(version 2.8, sections 13.3.1.1, 13.3.3) defines the ESP as a FAT32 file
system which is located (directly) on a GPT partition. While this does
not seem to be part of the specification, some UEFI implementations
expect to be able to write to an ESP.

Can you name _one_ UEFI implementation that actually does write to an
ESP?


FWIW, when installing Fedora with the default installer and selecting a RAID-1 scheme there, the EFI system partition is created on a superblock 1.0 RAID-1. Thus, the Fedora developers seem to be pretty sure that there isn't any UEFI implementation that expects to be able to write to an ESP ...

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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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