I have this exact same issue, did you guys get anywhere with this, or find the cause?

It’s difficult to debug because as far as the engine and hosts involved are concerned it was successful. It’s just the VM stops responding to pings etc after migration and the console freezes exactly as described here.

I’m using oVirt 4.5.1 Cluster 4.7. I’ve even reinstalled oVirt Node on the problem host still behaves the same. I’ve tried removing all VirtIO devices from the VM, I’ve tried with lower CPU family profiles, I’ve tried with different BIOS/UEFI settings.

In some cases the VM freezes moving away from the problem host as well which is interesting.

From: Arik Hadas <ahadas@redhat.com>
Sent: 31 March 2022 15:11
To: Moshe Sheena <msheena@redhat.com>
Cc: users <users@ovirt.org>
Subject: [ovirt-users] Re: VM hangs after migration

Moshe, this sounds similar to what we've seen in your environment, no?

Did you manage to resolve it?

On Thu, Mar 31, 2022 at 12:57 PM Giorgio Biacchi <giorgio@di.unimi.it> wrote:

Hi,
I have a fresh Ovirt installation (4.4.10.7-1.el8 engine and oVirt Node
4.4.10) on a Dell VRTX chassis. There are 3 blades, two of them are
identical hardware (PowerEdge M630) and the third is a little newer
(PowerEdge M640). The third has different CPUs, more RAM, and slower
NICs. I also have a bunch of data domains some on the shared PERC
internal storage and others on an external iSCSI storage, all seems
configured correctly and all the hosts are operational.

I can migrate a VM back and forth from the first two blades without any
problem, I can migrate a VM to the third blade but when I migrate a VM
from the third blade to any of the other two the task terminate
successfully, the VM is marked as up on the target host but the VM
hangs, the console is frozen and the VM stops to respond to ping.

I have no clues about why this is happening and I'm looking for
suggestions about how to debug and hopefully fix this issue.

Thanks in advance
--
gb

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