Hi,

Deploying oVirt 4.4.1.1 via Cockpit --> Hosted Engine --> Hyperconverged fails at Gluster deployment:

TASK [gluster.infra/roles/backend_setup : Create thick logical volume] *********
failed: [fmov1n3.sn.dtcorp.com] (item={'vgname': 'gluster_vg_nvme0n1', 'lvname': 'gluster_lv_engine', 'size': '100G'}) => {"ansible_index_var": "index", "ansible_loop_var": "item", "changed": false, "err": "  Volume group \"gluster_vg_nvme0n1\" has insufficient free space (25599 extents): 25600 required.\n", "index": 0, "item": {"lvname": "gluster_lv_engine", "size": "100G", "vgname": "gluster_vg_nvme0n1"}, "msg": "Creating logical volume 'gluster_lv_engine' failed", "rc": 5}
failed: [fmov1n1.sn.dtcorp.com] (item={'vgname': 'gluster_vg_nvme0n1', 'lvname': 'gluster_lv_engine', 'size': '100G'}) => {"ansible_index_var": "index", "ansible_loop_var": "item", "changed": false, "err": "  Volume group \"gluster_vg_nvme0n1\" has insufficient free space (25599 extents): 25600 required.\n", "index": 0, "item": {"lvname": "gluster_lv_engine", "size": "100G", "vgname": "gluster_vg_nvme0n1"}, "msg": "Creating logical volume 'gluster_lv_engine' failed", "rc": 5}
failed: [fmov1n2.sn.dtcorp.com] (item={'vgname': 'gluster_vg_nvme0n1', 'lvname': 'gluster_lv_engine', 'size': '100G'}) => {"ansible_index_var": "index", "ansible_loop_var": "item", "changed": false, "err": "  Volume group \"gluster_vg_nvme0n1\" has insufficient free space (25599 extents): 25600 required.\n", "index": 0, "item": {"lvname": "gluster_lv_engine", "size": "100G", "vgname": "gluster_vg_nvme0n1"}, "msg": "Creating logical volume 'gluster_lv_engine' failed", "rc": 5}

Deployment is on 3 count Dell PowerEdge R740xd with 5 count 1.6TB NVMe drives per host.  Deployment is only to three as JBOD, 1 drive per node per volume (engine, data, vmstore) utilizing VDO.
 Thus, deploying even a 100G volume to 1.6TB drive fails with "insufficient free space" error.

I suspect this might have to do with the Ansible playbook deploying Gluster mishandling the logical volume creation due to the rounding error as described here: https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html/logical_volume_manager_administration/nofreeext

If I can provide any additional information, logs, etc. please ask.  Also, if anyone has experience/suggestions with Gluster config for hyperconverged setup on NVMe drives I would greatly appreciate any pearls of wisdom.

Thank you so very much for any assistance!
Charles
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