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 <[email protected]>
Date: Wednesday, 30 November 2022 at 12:13
To: users <[email protected]>
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?
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