This is the way it's always been. RAID can't really handle mismatched drives either and you must consider that when purchasing drives. It's not a flaw, it's a consequence of geometry

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StopDisinfo910 2 days ago | parent [-]

It’s strange you say that because my btrfs array handles mismatched sizes just fine.

	▲	Elhana 2 hours ago \| parent [-]
		Let's say you can put a hdd and ssd of different sizes in raid1, but doesnt mean you should.