On 05/15/2015 04:29 PM, Alex Regan wrote:
However, on UEFI, /boot/efi on RAID is not supported. I'm not sure I
understand all the reasons for that, but I'm actually going to be
experimenting this weekend to see whether that works for a partition
with 0.90 or 1.0 metadata, and a system that does not boot Windows.
That would be great.
Sorry to say that the one system I have where I can test this has a
Gigabyte motherboard with a buggy UEFI (Hybrid UEFI) implementation. It
resets the EFI boot order in between boots, so nothing that is set with
"efibootmgr" persists. Spent a while on that before giving up.
So, I still don't know whether an EFI System Partition can be RAID 1
with metadata 0.90 or 1.0. I can't find any documentation that gives a
reason why it can't.
If anyone else wants to test that out, I think the following would be a
good way to start. (but only do this on a test system, because you might
destroy everything)
# Set an unused md device name
raid=/dev/md125
# Set your EFI boot partitions
efip1=/dev/sda1
efip2=/dev/sdb1
# Save /boot/efi
cd /boot
tar cf efi.tar efi
# Create the RAID device
umount /boot/efi
mdadm --create "$raid" --level=1 --raid-devices=2 \
--metadata=0.90 "$efip1" "$efip2"
# Create the filesystem
mkfs -t vfat "$raid"
# Get the UUID of the new filesystem
blkid "$raid"
# Fix the entry for /boot/efi in /etc/fstab
vi /etc/fstab
# If you got the previous two steps right, the filesystem will mount
mount /boot/efi
# Restore /boot/efi
cd /boot
tar xf efi.tar
reboot
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