I recall some earlier ovirt users list postings with similar issues with the NAS. 
One thought they solved it by changing the ovirt storage domain config NFS version to a lower version instead of whatever it was defaulting to. 
The other was blaming the NAS software ZFS underlying the NFS causing some issues. 

CentOS mdraid disks that are xfs formatted and exported NFS to oVirt seems to work fine in the instances I'm aware of.

On Thu, Feb 11, 2021 at 2:51 AM <stankunas.justas@gmail.com> wrote:
Justas Stankūnas <stankunas.justas@gmail.com>

Wed, Feb 10, 11:29 PM (10 hours ago)

to infra-owner
Hi,

so i have just installed oVirt on 4 nodes (oVirt node 4.4.4) with a hosted engine. For storage I have TrueNAS dedicated machine for NFS.
hosts are all identical Lenovo thinkcentre m92 with (Intel(R) Core(TM) i5-3470T CPU @ 2.90GHz and 16 GB of RAM).
everything is connected with a physical managed switch over 1Gbps each.

everything is setup without any additional configuration. There is only a single vm (hosted engine). but hosts are constant errors and warnings being presented and I am lost even from where to start looking.



Time    |   Message
Feb 10, 2021, 11:07:38 PM| |VM HostedEngine is not responding.
Feb 10, 2021, 10:46:48 PM| |VM HostedEngine is not responding.
Feb 10, 2021, 10:46:35 PM| |Failed to connect Host host1.local to Storage Pool Home
Feb 10, 2021, 10:46:35 PM| |Host host1.local cannot access the Storage Domain(s) ovirt_manager_nfs attached to the Data Center Home. Setting Host state to Non-Operational.
Feb 10, 2021, 10:46:35 PM| |Host host1.local reports about one of the Active Storage Domains as Problematic.
Feb 10, 2021, 10:46:17 PM| |VDSM host1.local command Get Host Statistics failed: Connection timeout for host 'host1.local', last response arrived 17522 ms ago.
Feb 10, 2021, 10:36:27 PM| |VM HostedEngine is not responding.
Feb 10, 2021, 10:25:54 PM| |VM HostedEngine is not responding.
Feb 10, 2021, 10:05:03 PM| |VM HostedEngine is not responding.
Feb 10, 2021, 10:04:54 PM| |Failed to connect Host host1.local to Storage Pool Home
Feb 10, 2021, 10:04:54 PM| |Host host1.local cannot access the Storage Domain(s) ovirt_manager_nfs attached to the Data Center Home. Setting Host state to Non-Operational.
Feb 10, 2021, 10:04:54 PM| |Host host1.local reports about one of the Active Storage Domains as Problematic.
Feb 10, 2021, 10:04:33 PM| |Invalid status on Data Center Home. Setting Data Center status to Non Responsive (On host host3.local, Error: Network error during communication with the Host.).
Feb 10, 2021, 10:04:33 PM| |VDSM host3.local command SpmStatusVDS failed: Connection timeout for host 'host3.local', last response arrived 2184 ms ago.
Feb 10, 2021, 9:54:41 PM| |VM HostedEngine is not responding.
Feb 10, 2021, 9:33:47 PM| |VM HostedEngine is not responding.
Feb 10, 2021, 9:25:52 PM| |VDSM host2.local command Get Host Statistics failed: Message timeout which can be caused by communication issues
Feb 10, 2021, 9:23:22 PM| |VM HostedEngine is not responding.
Feb 10, 2021, 9:12:51 PM| |Failed to connect Host host1.local to Storage Pool Home
Feb 10, 2021, 9:12:51 PM| |Host host1.local cannot access the Storage Domain(s) nfs_vms attached to the Data Center Home. Setting Host state to Non-Operational.
Feb 10, 2021, 9:12:51 PM| |Host host1.local reports about one of the Active Storage Domains as Problematic.
Feb 10, 2021, 9:12:44 PM| |Invalid status on Data Center Home. Setting Data Center status to Non Responsive (On host host3.local, Error: Network error during communication with the Host.).
Feb 10, 2021, 9:12:44 PM| |VDSM host1.local command Get Host Statistics failed: Connection timeout for host 'host1.local', last response arrived 16869 ms ago.
Feb 10, 2021, 9:12:44 PM| |VDSM host3.local command SpmStatusVDS failed: Connection timeout for host 'host3.local', last response arrived 16931 ms ago.
Feb 10, 2021, 9:02:51 PM| |VM HostedEngine is not responding.
Feb 10, 2021, 8:52:25 PM| |VM HostedEngine is not responding.
Feb 10, 2021, 8:31:34 PM| |VM HostedEngine is not responding.
Feb 10, 2021, 8:21:06 PM| |VM HostedEngine is not responding.
Feb 10, 2021, 8:20:36 PM| |Invalid status on Data Center Home. Setting Data Center status to Non Responsive (On host host3.local, Error: Network error during communication with the Host.).
Feb 10, 2021, 8:20:36 PM| |VDSM host3.local command Get Host Statistics failed: Connection timeout for host 'host3.local', last response arrived 23346 ms ago.
Feb 10, 2021, 8:10:11 PM| |Failed to connect Host host1.local to Storage Pool Home
Feb 10, 2021, 8:10:11 PM| |Host host1.local cannot access the Storage Domain(s) ovirt_manager_nfs, nfs_vms, iso attached to the Data Center Home. Setting Host state to Non-Operational.
Feb 10, 2021, 8:10:10 PM| |Host host1.local reports about one of the Active Storage Domains as Problematic.
Feb 10, 2021, 8:10:01 PM| |Failed to connect Host host4.local to Storage Pool Home
Feb 10, 2021, 8:10:01 PM| |Host host4.local cannot access the Storage Domain(s) nfs_vms attached to the Data Center Home. Setting Host state to Non-Operational.
Feb 10, 2021, 8:10:00 PM| |Host host4.local reports about one of the Active Storage Domains as Problematic.
Feb 10, 2021, 8:09:52 PM| |VDSM host1.local command Get Host Statistics failed: Connection timeout for host 'host1.local', last response arrived 22891 ms ago.
Feb 10, 2021, 7:56:14 PM| |Failed to connect Host host2.local to Storage Pool Home
Feb 10, 2021, 7:56:14 PM| |Host host2.local cannot access the Storage Domain(s) iso, ovirt_manager_nfs, nfs_vms attached to the Data Center Home. Setting Host state to Non-Operational.
Feb 10, 2021, 7:56:14 PM| |Host host2.local reports about one of the Active Storage Domains as Problematic.
Feb 10, 2021, 7:56:06 PM| |Invalid status on Data Center Home. Setting Data Center status to Non Responsive (On host host3.local, Error: Network error during communication with the Host.).
Feb 10, 2021, 7:56:06 PM| |VDSM host3.local command SpmStatusVDS failed: Connection timeout for host 'host3.local', last response arrived 24449 ms ago.
Feb 10, 2021, 7:46:10 PM| |VM HostedEngine is not responding.
Feb 10, 2021, 7:45:40 PM| |Invalid status on Data Center Home. Setting Data Center status to Non Responsive (On host host3.local, Error: Network error during communication with the Host.).
Feb 10, 2021, 7:45:40 PM| |VDSM host3.local command SpmStatusVDS failed: Connection timeout for host 'host3.local', last response arrived 24857 ms ago.
Feb 10, 2021, 7:35:49 PM| |VM HostedEngine is not responding.
Feb 10, 2021, 7:25:20 PM| |VM HostedEngine is not responding.
Feb 10, 2021, 7:24:50 PM| |Invalid status on Data Center Home. Setting Data Center status to Non Responsive (On host host3.local, Error: Network error during communication with the Host.).
Feb 10, 2021, 7:24:50 PM| |VDSM host3.local command Get Host Statistics failed: Connection timeout for host 'host3.local', last response arrived 27295 ms ago.
Feb 10, 2021, 7:14:55 PM| |VM HostedEngine is not responding.
Feb 10, 2021, 7:07:37 PM| |Failed to connect Host host1.local to Storage Pool Home
Feb 10, 2021, 7:07:37 PM| |Host host1.local cannot access the Storage Domain(s) ovirt_manager_nfs, nfs_vms, iso attached to the Data Center Home. Setting Host state to Non-Operational.
Feb 10, 2021, 7:07:37 PM| |Host host1.local reports about one of the Active Storage Domains as Problematic.
Feb 10, 2021, 7:07:30 PM| |Failed to connect Host host4.local to Storage Pool Home
Feb 10, 2021, 7:07:30 PM| |Host host4.local cannot access the Storage Domain(s) nfs_vms attached to the Data Center Home. Setting Host state to Non-Operational.
Feb 10, 2021, 7:07:30 PM| |Host host4.local reports about one of the Active Storage Domains as Problematic.
Feb 10, 2021, 7:07:23 PM| |Invalid status on Data Center Home. Setting Data Center status to Non Responsive (On host host3.local, Error: Network error during communication with the Host.).
Feb 10, 2021, 7:07:23 PM| |VDSM host3.local command SpmStatusVDS failed: Connection timeout for host 'host3.local', last response arrived 22551 ms ago.
Feb 10, 2021, 6:46:56 PM| |Failed to connect Host host1.local to Storage Pool Home
Feb 10, 2021, 6:46:56 PM| |Host host1.local cannot access the Storage Domain(s) ovirt_manager_nfs, iso attached to the Data Center Home. Setting Host state to Non-Operational.
Feb 10, 2021, 6:46:55 PM| |Host host1.local reports about one of the Active Storage Domains as Problematic.
Feb 10, 2021, 6:46:50 PM| |Invalid status on Data Center Home. Setting Data Center status to Non Responsive (On host host1.local, Error: Network error during communication with the Host.).
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