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

[Sahina Bose]

On Thu, Mar 30, 2017 at 4:39 PM, Sahina Bose <sabose at redhat.com> wrote:

>
>
> 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
>

Sorry, missed that in your previous email. So you'll be upgrading from
3.7.6 to 3.8.x.
If you do have the option of an offline upgrade - that's the safest, though
rolling upgrade is also possible from 3.7



>
>
>>
>>> 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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