Gluster users - Aug 2012 - Convert a Distribute only volume to a Distribute-Replicate Volume

I know this was not possible before version 3.3.0, but the "What's
New"
for 3.3.0 says:

"Ability to change replica count on an active volume (possibly including
ability to add replication to distribute-only volumes)"

So, if this is now possible, how does one do it.

Thanks,
Johnny Hughes

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