On 09/16/2013 03:56 PM, Francis Moreau wrote:

I did give your patch "DDF: compare_super_ddf: fix sequence number
check" a try and now mdadm is able to detect a difference between the
2 disks. Therefore it refuses to insert the second disk which is
better.

However it's still not able to detect which version is the "fresher"
like mdadm does with soft RAID1 (metadata 1.2). Therefore mdadm is not
able to kick out the first disk if it's the outdated one.

Is that expected ?

At the moment, yes. This needs work.

Martin