I confirm: 
I am not able to modify compatibility level using engine UI.
I'm running oVirt Version 3.6.7.5-1.el7.centos and I would upgrade to
4.0
I was able to migrate HostedEngine to Default Cluster
On one of the clusters (CentOS7 cluster) I can't change Compatibility
level from 3.5 to 3.6 value 
Now the problem is that I have a gluster volume.
If I delete Gluster Volume from HE UI can I loss data?

Il giorno mar, 20/09/2016 alle 10.38 +0300, Yaniv Dary ha scritto:
> You can also put all HE hosts on that cluster to local maintenance
> and shutdown the vm. It will start up on another cluster.
> Yaniv Dary
> Technical Product Manager
> Red Hat Israel Ltd.
> 34 Jerusalem Road
> Building A, 4th floor
> Ra'anana, Israel 4350109
> Tel : +972 (9) 7692306
>         8272306
> Email: yd...@redhat.com
> IRC : ydary
> 
> On Sep 20, 2016 10:18 AM, "Fedele Stabile" <fedele.stabile@fis.unical
> .it> wrote:
> > For some reason it is not possible migration of he vm to another
> > cluster.
> > This is the reason I asked for direct DB modification.
> > Fedele
> > 
> > Il giorno mar, 20/09/2016 alle 10.09 +0300, Yaniv Dary ha scritto:
> > > You can live migrate the he vm cross cluster and then upgrade the
> > > compatibility level.
> > > Yaniv Dary
> > > Technical Product Manager
> > > Red Hat Israel Ltd.
> > > 34 Jerusalem Road
> > > Building A, 4th floor
> > > Ra'anana, Israel 4350109
> > > Tel : +972 (9) 7692306
> > >         8272306
> > > Email: yd...@redhat.com
> > > IRC : ydary
> > >
> > > On Sep 20, 2016 9:50 AM, "Fedele Stabile" <fedele.stab...@fis.uni
> > cal.
> > > it> wrote:
> > > > As I wrote this morning using a smartphone:
> > > > I can't change compatibility using UI engine because the HE is
> > > > running.
> > > > For this reason I need to change the compatibility value in the
> > DB.
> > > > The problem is that in oVirt 3.6 I can't find any cluster named
> > > > table
> > > > as described in Comment 17 of
> > > > https://bugzilla.redhat.com/show_bug.cgi?id=1341023
> > > > Can anyone verify?
> > > > Thank you
> > > > Fedele
> > > >
> > > > Il giorno mar, 20/09/2016 alle 01.29 +0300, Yaniv Dary ha
> > scritto:
> > > > > You can't mess with the cluster level. It's a recipe for
> > trouble.
> > > > > Please upgrade the cluster compatibility via manager. 
> > > > > What is the issues with doing this you have?
> > > > > Yaniv Dary
> > > > > Technical Product Manager
> > > > > Red Hat Israel Ltd.
> > > > > 34 Jerusalem Road
> > > > > Building A, 4th floor
> > > > > Ra'anana, Israel 4350109
> > > > > Tel : +972 (9) 7692306
> > > > >         8272306
> > > > > Email: yd...@redhat.com
> > > > > IRC : ydary
> > > > >
> > > > > On Sep 19, 2016 6:36 PM, "Fedele Stabile" <fedele.stabile@fis
> > .uni
> > > > cal.
> > > > > it> wrote:
> > > > > > Ah,
> > > > > > I want to migrate to ovirt 4.x and I read that I have to
> > change
> > > > the
> > > > > > compatibily level of the cluster.
> > > > > >
> > > > > > Il giorno lun, 19/09/2016 alle 17.31 +0200, Fedele Stabile
> > ha
> > > > > > scritto:
> > > > > > > Hello,
> > > > > > > I have ovirt-release36-3.6.7-1 and ovirt-engine-setup-
> > > > 3.6.7.5-
> > > > > > > 1.el7.centos
> > > > > > > and I can't find cluster table in the DB engine to force
> > to
> > > > > > > compatibility version 3.6
> > > > > > > as described in https://bugzilla.redhat.com/show_bug.cgi?
> > id=1
> > > > 3410
> > > > > > 23
> > > > > > > infact I have HostedEngine running on a cluster and I
> > can't
> > > > > > change
> > > > > > > it's
> > > > > > > compatibility.
> > > > > > > Can you help me?
> > > > > > >
> > > > > > >
> > > > > > > _______________________________________________
> > > > > > > Users mailing list
> > > > > > > Users@ovirt.org
> > > > > > > http://lists.ovirt.org/mailman/listinfo/users
> > > > > >
> > > > > > _______________________________________________
> > > > > > Users mailing list
> > > > > > Users@ovirt.org
> > > > > > http://lists.ovirt.org/mailman/listinfo/users
> > > > > >
> > > >
> > > >
> > 
> > 

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