Ubuntu
grub-installer package

  1. Bug #1466150
  2. Comment #32

Comment 32 for bug 1466150

Revision history for this message
Georg Sauthoff (g-sauthoff) wrote :

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 ...