Gluster users - Sep 2013 - Gluster NFS Replicate bricks different size

I've mounted a gluster 1x2 replica through NFS in oVirt. The NFS share
holds the qcow images of the VMs.

I recently nuked a whole replica brick in an 1x2 array (for numerous other
reasons including split-brain), the brick self healed and restored back to
the same state as its partner.

4 days later, they've become inbalanced. The direct `du` of the /brick are
showing different sizes by around 20GB. I can see at brick level how some
images are not the same size. I don't think this is normal, but I can't
see
anything to point what could be the issue.

gluster volume heal STORAGE info
gluster volume heal STORAGE info split-brain

Shows no issues.

Any suggestions?

Cheers,
Andrew.
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