On Friday 20 April 2012 16:49:48 Tydus Ken wrote:

> I guess there's something wrong with btrfs in how to deal with two
> partition with same UUID or something else, but I'm not sure.

I don't believe that btrfs can cope with partitions with the same UID.  
A pointer here from Auke in July 2011:

http://marc.info/?l=linux-btrfs&m=131161949201880&w=2

# Resetting the UUID on btrfs isn't a quick-and-easy thing - you
# have to walk the entire tree and change every object. We've got
# a bad-hack in meego that uses btrfs-debug-tree and changes the
# UUID while it runs the entire tree, but it's ugly as hell.
#
# You shouldn't clone btrfs really, just make a new filesystem.

That hack is for an unmounted filesystem, but I don't believe it's 
been shared on this list.

Jan Schmidt was working on a "btrfs send" type command to help with 
this, but I've not heard anything recently (last December he posted 
that he was distracted by the backref-walking code which was a 
necessary precursor for the send/receive code).

cheers,
Chris
-- 
 Chris Samuel  :  http://www.csamuel.org/  :  Melbourne, VIC

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