Re: Soft RAID and EFI systems

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On 2. Februar 2014 22:39:31 MEZ, Francis Moreau <francis.moro@xxxxxxxxx> wrote:
>Hi Martin,
>
>On 02/01/2014 11:04 PM, Martin Wilck wrote:
>> Hi Francis,
>> 
>>> 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.
>> 
>> there is no big difference between EFI and legacy systems in this
>area.
>
>Well  the main difference I can see is that EFI firmwares access a
>filesystem where as BIOS doesn't in order to load  the bootloader.

The EFI BIOS needs a driver to access the RAID array. But so does the legacy BIOS for accessing the MBR.

If you really want to do RAID on partitions, you can put your md-capable EFI boot loader on the EFI system partition. It will work just like in the legacy case. The UEFI partition itself  is of course non-uRAID in this setup, but the same holds for your legacy MBR.

Martin

>
>In the case of BIOS you can still rely on a bootloader such as grub to
>access a partition with MD RAID on it.
>
>Thanks


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