Hey,

This is noted in the documents: https://www.ovirt.org/documentation/upgrade_guide/index.html#Changing_the_Cluster_Compatibility_Version_minor_updates

I recommend if you can't cope with it (i.e: logging to console and reconfiguring the NICs/Disks) it to change the VM custom emulated machine to "pc-q35-rhel8.1.0", this is the default emulated machine when cluster compatibility level is set to 4.4.

Also note, if you heavily rely on VNC, there's a bug introduced in libvirt 8 that won't allow to set password length longer than 8 chars, oVirt by default tries to set a password length of 12 chars but up until now libvirt simply ignored that and set the password based on the first 8 chars, i don't know from which version that happened but in 4.4.10 you won't be able to use VNC so i recommend to use SPICE (which is actually much better).

On Fri, Apr 22, 2022 at 2:57 PM David Sekne <david.sekne@gmail.com> wrote:

Hello,

I have noticed that some of our Windows VM's (2012 - 2022) randomly won't boot when reboot is initiated from guest OS. As far as I can tell this started happening after we raised the cluster compatibility from 4.4 to 4.5 (it's 4.6 now). To fix it a VM needs to be stopped and started.

We are running oVirt 4.4.10.

I cannot really see much from the logs if grepping for a specific VM that had these issues.

Example VM ID is: daf33e97-a76f-4b82-b4f2-20fa4891c88b

Im attaching logs:

- Initial hypervisor where VM was running on (reboot is initiated at 4:06:38 AM): vdsm-1.log
- Second hypervisor where VM was started after it was stopped and started back (this was done 7:45:43 AM): vdsm-2.log
- Engine log: engine.log

Has someone noticed any similar issues and can provide some feedback / help?

Regards,
David
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