ceph-ansible/roles/ceph-validate/tasks/check_devices.yml

---
- name: validate devices is actually a device
  parted:
    device: "{{ item }}"
    unit: MiB
  register: devices_parted
  with_items: "{{ devices }}"

- name: fail if one of the devices is not a device
  fail:
    msg: "{{ item }} is not a block special file!"
  when:
    - item.failed
  with_items: "{{ devices_parted.results }}"