Hi,

I would say that you observed ‘fencing’ and not SSH soft fencing, but actual reboot via IPMI.

https://www.ovirt.org/develop/developer-guide/engine/automatic-fencing.html

You can disable Power management for hosts.

Before doing that you need to understand following:

                -what is impact on VMs when this happens?

                                -the working assumption is that your VMs work just fine, but you need to think about other cases where VMs lose their storage and/or network.

For me it seems that this was storage domain that is not a VM storage domain, so VMs’ disks were just fine.

Maybe it was hosted_storage domain in your case…

                -any of those VMs are High-availability VMs? Once you disable Power Management you will not have automatic restart on different hosts of those.

You need to understand that idea of fencing is either to recover host automatically and possibly to restart VMs

and make sure that there are no duplicated VMs.

There are 100% cases where fencing is used and there is subset of those, X% number of cases where you would consider that behavior is suboptimal.

The drawback of disabling fencing is that you might get suboptimal behavior in Y% cases (100% minus X%)

BR,

Konstantin

From: Murilo Morais <murilo@evocorp.com.br>
Date: Wednesday, 30 November 2022 at 12:13
To: users <users@ovirt.org>
Subject: [ovirt-users] Forced restart when losing communication with the Storages

Good morning everyone!

Is there a way to disable the forced reboot of the machines? This morning there was an event in our infrastructure where the hosts lost communication with the Storage but this caused all the hosts to restart abruptly.

Would this be the correct behavior of oVirt? Is there any way to disable this?