[ovirt-users] Query about running ovirt-4.2.1 engine support 3.x nodes ?

[Yedidyah Bar David]

On Mon, Mar 19, 2018 at 5:19 AM, Joseph Kelly <
Joseph.Kelly at 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 at 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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