> [ ... ] btrfs incorporates disk management which is actually a
> version of md layer, [ ... ]

As far as I know Btrfs has no disk management, and was wisely
designed without any, just like MD: Btrfs volumes and MD sets
can be composed from "block devices", not disks, and block
devices are quite high level abstractions, as they closely mimic
the semantics of a UNIX file, not a physical device.
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