[ovirt-users] Upgrade datacenter from 3.6 to 4.0

[Arnaud Lauriou]

Upgrade done. In my case, the engine was already updated to the latest 
4.x release before the hosts.
Following marks 1 and 2 works fine.
After upgrading the cluster compatibility version, got message to reboot 
all the VMs.
Don't know if I really have to do that.


On 08/23/2016 02:28 PM, Barak Korren wrote:
>
> The following process worked for me:
> 1. ensure all hosts are running el7 or above, and all clusters had 
> been upgraded to 3.6 level
> 2. upgrade vdsm to 4.x on all hosts (assuming you are not using 
> ovirt-node) by switching to maintainance upgrading and activating one 
> by one to avoid VM downtime.
> 3. Upgrade engine by following one of the documented procedures (we 
> just inatalled a new machine for it and switched DNS after 
> backup/restore).
> 4. Once satisfied that illing back to 3.6 engine will not be needed - 
> upgrade cluster level.
>
>
> בתאריך 23 באוג׳ 2016 12:43,‏ "Arnaud Lauriou" <arnaud.lauriou at irisa.fr 
> <mailto:arnaud.lauriou at irisa.fr>> כתב:
>
>     Hi,
>
>     What is the best way to upgrade a datacenter from ovirt 3.6 to 4.0 ?
>     Upgrade engine, hosts then cluster ?
>     If right, how do you upgrade a host running ovirt 3.6.7 ? Simple
>     upgrade or fresh install ?
>     During the update process of a cluster, some hosts will be in
>     3.6.7 and others in 4.0.2, is it a problem for migrating VMs ?
>
>     Found docs about engine upgrade but not a lot about host and cluster.
>
>     Thanks,
>
>     Arnaud
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