The ansible_lvm fact contains a managed nodes (e.g. the target system) LVM (logical volume manager) information. You must be root to gather that LVM facts, thus you'll typically want to use the remote_user: root parameter.

For example, let's say you have the following playbook. 

---
- hosts: all
  remote_user: root
  tasks:
    - debug:
        var: ansible_lvm
...

Something like this should be returned.

• lvs = logical volume size (like the lvdisplay command)
• pvs = physical group size (like the pvdisplay command)
• vgs = volume group size (like the vgdisplay command)

ok: [lab1.software.eng.us] => {
    "ansible_lvm": {
        "lvs": {
            "root": {
                "size_g": "7.00",
                "vg": "fedora_fedora"
            }
        },
        "pvs": {
            "/dev/sda2": {
                "free_g": "0",
                "size_g": "7.00",
                "vg": "fedora_fedora"
            }
        },
        "vgs": {
            "fedora_fedora": {
                "free_g": "0",
                "num_lvs": "1",
                "num_pvs": "1",
                "size_g": "7.00"
            }
        }
    }
}