Hi Gianluca,

As mentioned in below RFE, EL 8.4 is not enough, you also need Advanced Virtualization 8.4 (libvirt >= 7.0.0) and AFAIK this has not been released upstream:


So right now you can use 4.6 cluster level only on hosts running on CentOS Stream.

Also the error message tells you that all your Up hosts need to provide EL + AV 8.4 features before you upgrade cluster level. But of course you can upgrade them one by one, it's not required to put all hosts into Maintenance before upgrade.

Regards,
Martin


On Tue, Jun 8, 2021 at 3:40 PM Gianluca Cecchi <gianluca.cecchi@gmail.com> wrote:
Hello,
I updated all my 3 CentOS 4.4.5 hosts to 4.4.6.
Or at least upgrading them from the GUI I see now they are on CentOS 8.4 and:
[root@ov200 ~]# rpm -qa| grep 4.4.6
ovirt-release44-4.4.6.3-1.el8.noarch
ovirt-host-4.4.6-1.el8.x86_64
ovirt-host-dependencies-4.4.6-1.el8.x86_64
[root@ov200 ~]#

How to see from the webadmin GUI or from the Host Console that they are indeed 4.4.6?

If I try to set cluster compatibility version to 4.6 I get:

Error while executing action: Cannot change Cluster Compatibility Version to higher version when there are active Hosts with lower version.
-Please move Host ov300, ov301, ov200 with lower version to maintenance first.

I don't remember the need of giving downtime to get new cluster version...

Or what are further requirements (and benefits....) to upgrade to 4.6?

Thanks,
Gianluca

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--
Martin Perina
Manager, Software Engineering
Red Hat Czech s.r.o.