[ovirt-users] oVirt 3.6 on CentOS 6.7 based HyperConverged DC : Upgradable?

[Nicolas Ecarnot]

[Please ignore the previous msg]

Hello,

One of our DC is a very small one, though quite critical.
It's almost hyper converged : hosts are compute+storage, but the engine 
is standalone.

It's made of :

Hardware :
- one physical engine : CentOS 6.7
- 3 physical hosts : CentOS 7.2

Software :
- oVirt 3.6.5
- glusterFS 3.7.16 in replica-3, sharded.

The goal is to upgrade all this to oVirt 4.1.1, and also upgrade the 
OSes. (oV 4.x only available on cOS 7.x)

At present, only 3 VMs here are critical, and I have backups for them.
Though, I'm quite nervous with the path I have to follow and the 
hazards. Especially about the gluster parts.

At first glance, I would go this way (feel free to comment) :
- upgrade the OS of the engine : 6.7 -> 7.3
- upgrade the OS of the hosts  : 7.2 -> 7.3
- upgrade and manage the upgrade of gluster, check the volumes...
- upgrade oVirt (engine then hosts)

But when upgrading the OSes, I guess it will also upgrade the gluster layer.

During this upgrade, I have no constraint to keep everything running, 
total shutdown is acceptable.

Is the above procedure seems OK, or may am I missing some essential points?

Thank you.

-- 
Nicolas ECARNOT
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