Comment 26 for bug 1466150

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John Robinson (john.robinson) wrote :

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.