New subject: VM hangs after migration

Monday, 27 June 2022

I'm seeing this too on oVirt 4.5.1 using CentOS Stream 8 for the hosts. 
The console is blank, no response to ping and I have to power off the VM 
and power it back on again to recover it.

On 26/06/2022 19:53, Christopher Law wrote:
...

 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(a)redhat.com&gt;
 *Sent:* 31 March 2022 15:11
 *To:* Moshe Sheena <msheena(a)redhat.com&gt;
 *Cc:* users <users(a)ovirt.org&gt;
 *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(a)di.unimi.it&gt; 
 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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Re: VM hangs after migration