tripleo-validations/roles/undercloud_disk_space/vars/main.yaml

---
metadata:
  name: Verify undercloud fits the disk space requirements
  description: >
    Make sure that the root partition on the undercloud node has enough
    free space.

    http://tripleo.org/install/environments/baremetal.html#minimum-system-requirements    
  groups:
    - prep
    - pre-introspection