Gluster users - Dec 2013 - adding bricks to replicated volume

Hi,
                I've seen this question asked a couple of times here
http://www.gluster.org/pipermail/gluster-users/2013-July/036414.html and here
http://supercolony.gluster.org/pipermail/gluster-users/2013-June/036272.html but
never fully answered, unless I'm reading the answers wrongly.

                I understand that bricks are replicated in pairs (with rep 2) in
the order in which they are added, so for a 3-node cluster we're planning on
having 6 bricks, 2 per node, and replicating in a pair-wise fashion, so that one
node never holds both bricks of a replica.  My question is what to do when you
add another node to the cluster.  It would have two bricks that are replicas of
each other.


a)      Is there a way of changing these pairings later on, even if just for the
new data?

b)      Could I take down the volume and add the bricks in one at a time again?

Thanks,
Anne
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