vgoyal added a new comment to an issue you are following:
``
I think you will have to destroy all images and containers stored in overlay 
and then setup devicemapper from that freed space.

Having said that, in theory a path might exist. If overlay2 does not use all 
free space, then in theory, one can setup devicemapper in rest of the free 
space and use atomic commands to migrate images/containers from overlay2 to 
devicemapper.

Having said that, migration logic has been racy and less used option. 

Shishir wrote support for migration containers from one storage to other.

@dwalsh, you know more about it and how well does it work and should we rely on 
this option or not.
``

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https://pagure.io/atomic-wg/issue/186
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