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

[Sahina Bose]

On Wed, Mar 29, 2017 at 10:36 PM, Liron Aravot <laravot at redhat.com> wrote:

>
>
> On Wed, Mar 29, 2017 at 4:35 PM, Nicolas Ecarnot <nicolas at ecarnot.net>
> wrote:
>
>> [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)
>>
>
> Hi Nicolas,
> Regards the gluster update - have your tried to ask in the gluster ml?
> I'm adding Sahina to share her opinion on that flow.
> Export domain as Didi suggested is indeed the easy way from oVirt
> perspective - but it'll take a long time to copy/restore, Gluster backup
> should perform faster if there's a solution that fit your needs.
>

Gluster does work with rolling upgrades - so there's no need to bring your
system offline.
Which glusterfs version are you on? Are you planning to update to gluster
3.10


>
>> 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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>
>
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