I'd email you this but I couldn't find an email :)
Does mdadm RAID5 array growing work like this? http://docs.sun.com/app/docs/doc/806-6111/6jf2ve3il?a=view
If you scroll down, you see "Concatenated (Expanded) RAID 5 Volume" and it appears that they don't actually reshape the array, they just add a disk onto the end of the existing array and somehow deal with the need for extra parity... I'm not sure how.
Is what mdadm does more advanced than this? I thought mdadm would be rebuilding the array bit by bit with the existing data.
Thank you for your work!
