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(a)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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