On 02/03/2014 10:56 AM, David Brown wrote:

On 31/01/14 18:02, Francis Moreau wrote:

quoted

Hello,

On EFI systems I'd like to RAID mirror /boot partition.

For HW RAID there's no issue since access to the disk or any
partitions should be totally transparent to the bios.

For Fake RAID, I'm not sure but I would say that the bios is able to
read the RAID metadata as well.

For (md) Soft RAID, I don't know. I would say that the bios is
unlikely to understand the md metadata stored in the /boot partition
so it won't work.
Is that correct ?
If so does that mean I can't mirror /boot partition on EFI systems ?
Maybe creating a RAID device using the whole disk (not the partition
device) would work ?

Thanks for your enlightments.

I can't answer your question as such, but in case you don't know
VirtualBox virtual machines can be configured with an EFI instead of a
normal bios.  I don't know how complete the emulation of EFI is, but
that might give you a quick and easy way to test out the different ideas.

Yes but I'll give some testing on qemu first, it seems that it's
possible to find and use a EFI bios for qemu.

thanks.