[ovirt-users] Migrating oVirt cluster from 4.0 to 4.1

[Pavel Gashev]

Tomas,

Since the restart is not actually required in my case, what if I set compatibility version in the DB directly to make the engine happy?

I have no plans to restart my VMs in this year. And I don’t want to block online updating of VM parameters by the “next run configuration”.


From: Tomas Jelinek <tjelinek at redhat.com>
Date: Monday, 12 June 2017 at 16:42
To: Pavel Gashev <Pax at acronis.com>
Cc: James <james at jloh.co>, users <users at ovirt.org>
Subject: Re: [ovirt-users] Migrating oVirt cluster from 4.0 to 4.1



On Mon, Jun 12, 2017 at 2:12 PM, Pavel Gashev <Pax at acronis.com<mailto:Pax at acronis.com>> wrote:
Can I update VMs compatibility version without restarting VMs?

yes, but it will be applied only after restart.


According to the source code, restarting is required during upgrading to 4.1 only if a VM uses random generator device. If it doesn’t, a restart is not really required.

right, but the VM will still be marked with this "next run configuration" and will be set to have the old compatibility version.



From: <users-bounces at ovirt.org<mailto:users-bounces at ovirt.org>> on behalf of Tomas Jelinek <tjelinek at redhat.com<mailto:tjelinek at redhat.com>>
Date: Monday, 12 June 2017 at 14:15
To: James <james at jloh.co<mailto:james at jloh.co>>
Cc: users <users at ovirt.org<mailto:users at ovirt.org>>
Subject: Re: [ovirt-users] Migrating oVirt cluster from 4.0 to 4.1



On Mon, Jun 12, 2017 at 12:17 PM, James <james at jloh.co<mailto:james at jloh.co>> wrote:
We recently moved our oVirt cluster from 4.0 to 4.1 and have migrated
all the hosts. The datacenter currently has a compatability setting of
4.1 but the cluster is still on 4.0. As cross-cluster migrations has
been removed (no option anymore?) we aren't 100% sure how to get the
cluster onto 4.1 whilst keeping the VMs online. Do we just change the
compatibility version live and it "just works" or do we have to have
downtime?

yes, you just change the compatibility version. The VMs which are down will be automatically updated and work with the new cluster, the running ones will be marked with a "triangle" icon and will be automatically updated on restart of them.


Any info would be great!

Regards,
James
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