---
- name: creating lvm as per requirement
  hosts: nodes
  tasks:
    - block:
         - block:
              - name: create a lvm of required size
                lvol:
                  vg: research
                  state: present
                  lv: data
                  size: 1500m
                when: ansible_lvm.vgs.research.size_g == "2.00"
         - block:
              - name: printing message
                debug:
                  msg: Requested size of lvm cannot be created as vg size is not that much

              - name: cretaing lvm of lesser size
                lvol:
                  vg: research
                  lv: data
                  state: present
                  size: 800m
           when: ansible_lvm.vgs.research.size_g == "1.07"
      when: ansible_lvm.vgs.research is defined

    - name: format the filesystem
      filesystem:
        device: /dev/mapper/research-data
        fstype: ext4
        state: present
...