Hi,

I checked the self-hosted doc and I see that High-Availability is provided by additional 
"self-hosted" capable hosts and a dedicated shared Storage Domain to store the 
engine VM.

What about the "upgrade-gone-wrong" case ?

I mean, before any important upgrade of any VM, we take a snapshot and revert 
to it if required.

We had a similar case when upgrading the engine from 4.3 to 4.4, where a 
mismatched cluster CPU type prevented starting VMs.
We were even working with two different engine VMs rather than snapshots 
because 4.3 was on OL7 et 4.4 is on OL8.
We had to revert for a while to the 4.3 engine waiting for the fix.

What's the plan w/ a self-hosted engine ?

*Laurent Duparchy*
*ESRF - The European Synchrotron
MIS Unit
04 76 88 22 56*
Michal Skrivanek wrote on 04/11/2022 15:43:

On 4. 11. 2022, at 15:03,[email protected]  wrote:

Thanks for your reply

with oVirt or elsewhere?
That was with XEN,  OCFS2 cluster context, which is more prone to instabilities.
Anyway, loosing the manager/engine when things start going wrong is just 
worsening the situation.
Yes, but oVirt does that quite differently. Despite the challenges around 
deployment I believe it's a way safer solution than trying to run this 
independently/manually.

Thanks,
michal

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