Why does Btrfs allow raid1 with mismatched drives? Also: How to look behind the curtain

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Hi,

 the subject is pretty selfexplanatory. I"m creating a btrfs using

sudo mkfs.btrfs -m raid1 -d raid1 <smalldisk> <largedisk>

it creates the fs, apparently with the size of the larger disk, no matter in which order i supply the disk-arguments.
How can this be correct?

Is there some way like "cat /proc/mdstat" to see what btrfs is doing and to assure myself my raid1 is secure? It's not
terribly important data, hence i'm trying btrfs, but i don't want to lose it either.

I posted this question on stackexchange as well: http://unix.stackexchange.com/questions/28357/why-does-btrfs-allow-to-create-a-raid1-with-mismatched-drives

Please CC me in any replies.

Regards
Fabian Zeindl--
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