<p dir="ltr">The following process worked for me:<br>
1. ensure all hosts are running el7 or above, and all clusters had been upgraded to 3.6 level <br>
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.<br>
3. Upgrade engine by following one of the documented procedures (we just inatalled a new machine for it and switched DNS after backup/restore).<br>
4. Once satisfied that illing back to 3.6 engine will not be needed - upgrade cluster level.</p>
<div class="gmail_extra"><br><div class="gmail_quote">בתאריך 23 באוג׳ 2016 12:43, "Arnaud Lauriou" <<a href="mailto:arnaud.lauriou@irisa.fr">arnaud.lauriou@irisa.fr</a>> כתב:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi,<br>
<br>
What is the best way to upgrade a datacenter from ovirt 3.6 to 4.0 ?<br>
Upgrade engine, hosts then cluster ?<br>
If right, how do you upgrade a host running ovirt 3.6.7 ? Simple upgrade or fresh install ?<br>
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 ?<br>
<br>
Found docs about engine upgrade but not a lot about host and cluster.<br>
<br>
Thanks,<br>
<br>
Arnaud<br>
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