I could be mistaken, but I think the issue is that ovirt engine believes the NFS domain is mandatory for all hypervisor hosts unless you put the storage domain into 'maintenance' mode.
It will notice its down and start trying to fence the offending hypervisors which in turn tries to migrate VMs to other hypervisors that also are marked bad because they can't reach the storage domain either. That's what I recall once seeing when I thought it was safe to temporarily take down an ISO NFS domain a few years ago.

On Fri, Jun 4, 2021 at 5:11 AM David White via Users <users@ovirt.org> wrote:
I'm trying to figure out how to keep a "broken" NFS mount point from causing the entire HCI cluster to crash.

HCI is working beautifully.
Last night, I finished adding some NFS storage to the cluster - this is storage that I don't necessarily need to be HA, and I was hoping to store some backups and less-important VMs on, since my Gluster (sssd) storage availability is pretty limited.

But as a test, after I got everything setup, I stopped the nfs-server.
This caused the entire cluster to go down, and several VMs - that are not stored on the NFS storage - went belly up.

Once I started the NFS server process again, HCI did what it was supposed to do, and was able to automatically recover.
My concern is that NFS is a single point of failure, and if VMs that don't even rely on that storage are affected if the NFS storage goes away, then I don't want anything to do with it.
On the other hand, I'm still struggling to come up with a good way to run on-site backups and snapshots without using up more gluster space on my (more expensive) sssd storage.

Is there any way to setup NFS storage for a Backup Domain - as well as a Data domain (for lesser important VMs) - such that, if the NFS server crashed, all of my non-NFS stuff would be unaffected?


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