On 02/04/2014 03:48 AM, David Brown wrote:

On 04/02/14 09:41, Francis Moreau wrote:

quoted

Are both v0.9 and v1.0 MD  put their metadata at the end of a partition
? I thought only v0.9 would do that.

Yes, it is only 0.9 format that is at the end of the partition.  This
means that a plain raid1 mirror (with as many disks as you like, as long
as they are simple mirrors and not raid10) looks just like a normal
partition for other tools.  As long as it is read-only, tools that are
not raid-aware can use it.  For example, grub and lilo can happily boot
from a 0.9 metadata raid1 array just like from a normal partition.
(Actually, modern grub understands a lot of md raid formats.)  The same
thing should apply to EFI, as long as it does not attempt to write to
the partition.

No, both 0.9 and 1.0 have metadata after the data area.  v1.1 and 1.2
have their metadata before the data area.

I've been using v1.0 on my /boot mirrors for a long time.

Phil