Failing to create a LV thinpool

I have 3 bare-metal servers on which I have 3 disks which are configured as a RAID. There are 3 partitions. One of these partitions I will use for my gluster cluster.

I've tried to configure a pool as follows:

---
- name: Create a GlusterFS brick on the servers
  remote_user: root
  hosts: gluster
  gather_facts: false
  vars:
    gluster_infra_disktype: JBOD
    # Dataalignment, for JBOD default is 256K if not provided.
    gluster_infra_dalign: 256K
    # VDO creation
    #gluster_infra_vdo:
      #- { name: 'hc_vdo_1', device: '/dev/md3' }
    gluster_infra_volume_groups:
      - { vgname: 'vg_md3', pvname: '/dev/md3' }
    # https://de.slideshare.net/GlusterCommunity/data-reduction-for-gluster-with-vdo
    # thinpoolname is optional, if not provided `vgname' followed by _thinpool is
    # used for name. poolmetadatasize is optional, default 16G is used
    gluster_infra_thinpools:
      - { vgname: 'vg_md3', thinpoolname: 'vg_md3_thinpool', thinpoolsize: '1.6T', poolmetadatasize: '2G' }
    # Thinvolumes for the brick. `thinpoolname' is optional, if omitted `vgname' followed by _thinpool is used
    gluster_infra_lv_logicalvols:
      - { vgname: 'vg_md3', thinpool: 'vg_md3_thinpool', vname: 'vg_md3_thinlv', lvsize: '1.8T' }
    gluster_infra_mount_devices:
      - { path: '/data/gluster/brick1', vgname: 'vg_md3', lvname: 'vg_md3_thinlv' }

  roles:
  - gluster.infra

Unfortunately this fails with:

TASK [gluster.infra/roles/backend_setup : Create a LV thinpool] *******************************************************************************************
failed: [prds0001] (item={'vgname': 'vg_md3', 'thinpoolname': 'vg_md3_thinpool', 'thinpoolsize': '1.6T', 'poolmetadatasize': '2G'}) => {"changed": false, "item": {"poolmetadatasize": "2G", "thinpoolname": "vg_md3_thinpool", "thinpoolsize": "1.6T", "vgname": "vg_md3"}, "module_stderr": "Shared connection to prds0001 closed.\r\n", "module_stdout": "Traceback (most recent call last):\r\n  File \"/root/.ansible/tmp/ansible-tmp-1544421225.6793776-67207272652594/AnsiballZ_lvol.py\", line 113, in <module>\r\n    _ansiballz_main()\r\n  File \"/root/.ansible/tmp/ansible-tmp-1544421225.6793776-67207272652594/AnsiballZ_lvol.py\", line 105, in _ansiballz_main\r\n    invoke_module(zipped_mod, temp_path, ANSIBALLZ_PARAMS)\r\n  File \"/root/.ansible/tmp/ansible-tmp-1544421225.6793776-67207272652594/AnsiballZ_lvol.py\", line 48, in invoke_module\r\n    imp.load_module('__main__', mod, module, MOD_DESC)\r\n  File \"/usr/lib/python3.5/imp.py\", line 234, in load_module\r\n    return load_source(name, filename, file)\r\n  File \"/usr/lib/python3.5/imp.py\", line 170, in load_source\r\n    module = _exec(spec, sys.modules[name])\r\n  File \"<frozen importlib._bootstrap>\", line 626, in _exec\r\n  File \"<frozen importlib._bootstrap_external>\", line 673, in exec_module\r\n  File \"<frozen importlib._bootstrap>\", line 222, in _call_with_frames_removed\r\n  File \"/tmp/ansible_lvol_payload_yyp74adb/__main__.py\", line 557, in <module>\r\n  File \"/tmp/ansible_lvol_payload_yyp74adb/__main__.py\", line 510, in main\r\nValueError: invalid literal for int() with base 10: '1.6'\r\n", "msg": "MODULE FAILURE\nSee stdout/stderr for the exact error", "rc": 1}

gluster / gluster-ansible-infra

Failing to create a LV thinpool #43