unexpected raid1 behavior?

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Hi, I'm starting to play with btrfs on my new computer. I'm running Gentoo and 
have compiled the 2.6.31 kernel, enabling btrfs.

Now I have 2 partitions (on 2 different sata disks) that are free for me to 
play with, each about 375 gb in size.  I wanted to create a "raid1" volume 
using these two partitions, so I did:
 
# mkfs.btrfs -d raid1 /dev/sda5 /dev/sdb5
# mount /dev/sda5 /btrfs

and everything seems fine.

Now what I find strange is that everything looks like a raid0 was created, not 
a raid1:

$ df -h /btrfs/
 Filesystem            Size  Used Avail Use% Mounted on
/dev/sda5             684G   72G  612G  11% /btrfs

What am I doing (or understanding) wrong?

Thanks!

Jp
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