On Mon, Mar 19, 2018 at 5:19 AM, Joseph Kelly < joseph.ke...@tradingscreen.com> wrote:
> Sorry to ask again, But I can see from the link below the that nodes and > engines should work between minor number > > upgrades. > Indeed. > But is ovirt 4.2.x backward compatible with, say, 3.6 nodes. Does anyone > know ? Is this documented anywhere ? > You can search the release notes pages of 4.2.z releases for '3.6' to find relevant bugs. Just _using_ such hosts, should work. Adding a 3.6 host to a 4.2 engine will likely break. It's definitely not intended to be used for long times - you are encouraged to upgrade your hosts too, soon after the engine. If you plan a very long transition period, I suggest to create a list of operations you might want/need to do, and test everything in a test environment. > > [ovirt-users] compatibility relationship between datacenter, ovirt and > cluster > https://www.mail-archive.com/users@ovirt.org/msg17092.html > > Thanks, > Joe. > > ------------------------------ > *From:* Joseph Kelly > *Sent:* Wednesday, March 14, 2018 5:32 PM > *To:* users@ovirt.org > *Subject:* Query about running ovirt-4.2.1 engine support 3.x nodes ? > > > Hello All, > > > I have two hopefully easy questions regarding an ovirt-4.2.1 engine > support and 3.x nodes ? > > > 1) Does an ovirt-4.2.x engine support 3.x nodes ? As This page states: > > > "The cluster compatibility is set according to the version of the least > capable host operating system in the cluster." > > > https://www.ovirt.org/documentation/upgrade-guide/chap-Post-Upgrade_Tasks/ > > > Which seems to indicate that you can run say a 4.2.1 engine with lower > version nodes, but is that correct ? > > > 2) And can you just upgrade the nodes directly from 3.x to 4.2.x as per > these steps ? > > > 1. Move the node to maintenance > 2. Add 4.2.x repos > 3. yum update > 4. reboot > 5. Activate (exit maintenance) > This should work. You can also use the admin web ui for updates, which might be better, didn't check recently. See also e.g.: https://bugzilla.redhat.com/show_bug.cgi?id=1344020 Best regards, -- Didi
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