Dear Strahil,

Last strange discovery. Newly installed VM – same OS, same NIC’s – connected to 
the same VLAN’s. Both machines are running on the same virtualization host.
Newly installed VM – no network issues at all. It works flawlessly.

It is really very strange.


From: Strahil <>
Sent: Sunday, January 12, 2020 5:58 PM
To: Latchezar Filtchev <>; users <>
Subject: RE: [ovirt-users] Re: Unstable VM network connectivity after upgrade 
4.2.8 to 4.3.7

I guess I didn't clarify myself.
I asked if you can shutdown the VM and then set only this VM's  'Custom 
compatibility mode' to 4.2 and power up to test.

Yet, if the cluster was at 4.2 when you imported , then I am afraid that the 
'Custom Compatibility mode' won't make a difference.

I'd recommend you to open a bug on<> and share the link with the 
mailing list. Many of the dev take a look here.

But st Regards,
Strahil Nikolov
On Jan 12, 2020 15:02, Latchezar Filtchev 
<<>> wrote:

Yes! It is.

After upgrade 4.2 to 4.3 datacenter and cluster compatibility mode was 4.2 when 
I discovered the issue. Then I set Cluster mode to 4.3 – no luck. It is not so 
easy to return it to 4.2.

Thank you!



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