Probably stupid questions but here goes:
Can btrfs use only a portion of a HDD in a raid "array"?
I have 3 HDDs: 80GB, 160GB, and 200GB external USB. I want to put root+boot in the first 20GB of the smallest drive on EXT4 and use the rest of the free space on all 3 drives for a btrfs "raid10 array". Is this possible?
Is this sane? Would you do it differently?