I currently have two disk of the same size (4TB each) in raid1.
I'm wondering if it's now possible to add an additional disk of size 8TB and have it as raid 1 with the other two disks acting as raid 0? Is this type of configuration supported by mdadm? So it would essentially be an additional layer - a raid on top of another raid.
In other words:
Raid 1 between: (8TB disk) + (raid 0 between: 2x 4TB) Total usable space: 8TB