Openshift+Atomic dm.basesize setting

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I'm looking to deploy openshift as a container within a cluster of three atomic based nodes.

On the following page ( it states the following:

"Meeting the /var/ file system sizing requirements in RHEL Atomic Host requires making changes to the default configuration. See Managing Storage in Red Hat Enterprise Linux Atomic Host for instructions on configuring this during or after installation."

It links to another document, but that document does not make mention of what configuration option I need to change.

However, based on past experiences with containers I'm assuming I need to change the default dm.basesize of docker on each atomic host. (The prereqs say openshift master will consume 30GB so I'm assuming I should set dm.basesize to 30GB but it's not clear in the docs if doing so is necessary.

What changes do I need to make to each atomic host?