[ovirt-users] Communication Problems between Engine and Hosts

[FERNANDO FREDIANI]

Hello Piotr. Thanks for your reply

I was running version 4.1.1, but since that day I have upgraded to 4.1.5 
(the Engine because the hosts remain on 4.1.1). I am not sure the logs 
still exists (how long they are kept normally).

Just to clarify the hosts didn't become unresponsive, but the 
communication between the Engine and the Hosts in question (each in a 
different Datacenter was interrupted - but locally the hosts were fine 
and accessible). What was strange was that since the Hosts could not 
talk to the Engine they seem to have got 'confused' and started several 
VM live migrations which was not expected. As a note I don't have any 
Fencing policy enabled.

Regards
Fernando


On 16/08/2017 07:00, Piotr Kliczewski wrote:
> Fernando,
>
> Which ovirt version are you running? Please share the logs so I could
> check what caused the hosts to become unresponsive.
>
> Thanks,
> Piotr
>
> On Wed, Aug 2, 2017 at 5:11 PM, FERNANDO FREDIANI
> <fernando.frediani at upx.com> wrote:
>> Hello.
>>
>> Yesterday I had a pretty strange problem in one of our architectures. My
>> oVirt which runs in one Datacenter and controls Nodes locally and also
>> remotelly lost communication with the remote Nodes in another Datacenter.
>> To this point nothing wrong as the Nodes can continue working as expected
>> and running their Virtual Machines each without dependency of the oVirt
>> Engine.
>>
>> What happened at some point is that when the communication between Engine
>> and Hosts came back Hosts got confused and initiated a Live Migration of ALL
>> VMs from one of the other. I had also to restart vdsmd agent on all Hosts in
>> order to get sanity my environment.
>> What adds up even more strangeness to this scenario is that one of the Hosts
>> affected doesn't belong to the same Cluster as the others and had to have
>> the vdsmd restarted.
>>
>> I understand the Hosts can survive without the Engine online with reduced
>> possibilities but can communicated between them, but without affecting the
>> VMs or even needing to do what happened in this scenario.
>>
>> Am I wrong on any of the assumptions ?
>>
>> Fernando
>>
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