jberkus added a new comment to an issue you are following:
The unallocated space is because we can't predict if the user will need more space for
containers, or more for other things (a Gluster storage partition, for example). This
means that, in the default case, the user can easily expand the partition where they run
out of room.
I cases where you know more about your users than we do in the "default" case,
you don't necessarily need the unallocated space.
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