you can check if this is valid: http://www.ovirt.org/documentation/upgrade-guide/upgrade-guide/
if its not or innacurate, please provide feedback.

regards,

2017-02-08 9:35 GMT-03:00 Yedidyah Bar David <didi@redhat.com>:
On Wed, Feb 8, 2017 at 2:26 PM, Massimo Mad <mad1969it@gmail.com> wrote:
> Hi David,
> I try to use yum update but i have this error :
> yum update
> Loaded plugins: fastestmirror, imgbased-warning
> Warning: yum operations are not persisted across upgrades!
> The problem is that on the server i have this repository:
> ovirt-4.0.repo
> ovirt-4.0-dependencies.repo
> With this repository it's possible upgrade ovirt only only between minor
> releases for example from 4.0.1 to 4.0.6, i want to upgrade the host from
> 4.0 to 4.1.

So please try adding 4.1 repos (install ovirt-release41) and then update.
--
Didi
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