Comment 20 for bug 1349711

Maybe different default options. I don't think a PV guest will know the difference of the backing real device. Would those not all be just blkfront pv block devices? Probably another detail we might be interested in here. If the device name for the pv was xvd* then its a pv disk (not using ec2 that much to know all things that might be possible).
And I am not saying the metadata+DUP thing is bad. But maxybe something to ask those people that have a better clue on btrfs. ;)