Re: [ovirt-users] Upgrade datacenter from 3.6 to 4.0

[Arnaud Lauriou]

Upgrade done. In my case, the engine was already updated to the latest 
4.x release before the hosts.

Following marks 1 and 2 works fine.
After upgrading the cluster compatibility version, got message to reboot 
all the VMs.

Don't know if I really have to do that.


On 08/23/2016 02:28 PM, Barak Korren wrote:


The following process worked for me:
1. ensure all hosts are running el7 or above, and all clusters had 
been upgraded to 3.6 level
2. upgrade vdsm to 4.x on all hosts (assuming you are not using 
ovirt-node) by switching to maintainance upgrading and activating one 
by one to avoid VM downtime.
3. Upgrade engine by following one of the documented procedures (we 
just inatalled a new machine for it and switched DNS after 
backup/restore).
4. Once satisfied that illing back to 3.6 engine will not be needed - 
upgrade cluster level.



בתאריך 23 באוג׳ 2016 12:43,‏ "Arnaud Lauriou" > כתב:


Hi,

What is the best way to upgrade a datacenter from ovirt 3.6 to 4.0 ?
Upgrade engine, hosts then cluster ?
If right, how do you upgrade a host running ovirt 3.6.7 ? Simple
upgrade or fresh install ?
During the update process of a cluster, some hosts will be in
3.6.7 and others in 4.0.2, is it a problem for migrating VMs ?

Found docs about engine upgrade but not a lot about host and cluster.

Thanks,

Arnaud
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Re: [ovirt-users] Upgrade datacenter from 3.6 to 4.0

[Michal Skrivanek]

> On 24 Aug 2016, at 05:09, Barak Korren  wrote:
> 
> 
> 
> On 23 August 2016 at 19:09, Christophe TREFOIS  > wrote:
> Small add. 
> 
> Shouldnt one update the engine first ?
> 
> Nope. 
> You should always update the hosts first. The other way around can work but 
> AFAIK this is what is being tested.

not really.
we do not define the order, and AFAIR last time we tried to check it was about 
50/50;-)
It is fully compatible both ways

> 
> 
> -- 
> Barak Korren
> bkor...@redhat.com 
> RHEV-CI Team
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Re: [ovirt-users] Upgrade datacenter from 3.6 to 4.0

[Dan Yasny]

Doesn't it make more sense for this major upgrade to be a simple new
install of engine v4, and importing the existing SDs?

On Wed, Aug 24, 2016 at 6:34 AM, Barak Korren  wrote:

>
>
> On 24 August 2016 at 12:32, Christophe TREFOIS 
> wrote:
>
>> Really? That’s strange, as the engine should be backward compatible with
>> previous versions no?
>>
>>
> Think about it like this - When an update comes out it gets pushed to the
> repos/channels. If you then go and provision a new host with some automated
> system like Foreman, you end up with the new VDSM. Also, since you can have
> a large amount of hosts, you may reasonably choose to use some automated
> system to keep them up to date. It is more reasonable to expect the engine
> machine to have a steadier/slower life cycle.
>
>
>
> --
> *Barak Korren*
> bkor...@redhat.com
> RHEV-CI Team
>
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>
>
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Re: [ovirt-users] Upgrade datacenter from 3.6 to 4.0

[Barak Korren]

On 24 August 2016 at 12:32, Christophe TREFOIS 
wrote:

> Really? That’s strange, as the engine should be backward compatible with
> previous versions no?
>
>
Think about it like this - When an update comes out it gets pushed to the
repos/channels. If you then go and provision a new host with some automated
system like Foreman, you end up with the new VDSM. Also, since you can have
a large amount of hosts, you may reasonably choose to use some automated
system to keep them up to date. It is more reasonable to expect the engine
machine to have a steadier/slower life cycle.



-- 
*Barak Korren*
bkor...@redhat.com
RHEV-CI Team
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Re: [ovirt-users] Upgrade datacenter from 3.6 to 4.0

[Christophe TREFOIS]

Really? That’s strange, as the engine should be backward compatible with 
previous versions no?

Anyway, I believe the devs :)

--

Dr Christophe Trefois, Dipl.-Ing.
Technical Specialist / Post-Doc

UNIVERSITÉ DU LUXEMBOURG

LUXEMBOURG CENTRE FOR SYSTEMS BIOMEDICINE
Campus Belval | House of Biomedicine
6, avenue du Swing
L-4367 Belvaux
T: +352 46 66 44 6124
F: +352 46 66 44 6949
http://www.uni.lu/lcsb

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On 24 Aug 2016, at 11:09, Barak Korren 
> wrote:



On 23 August 2016 at 19:09, Christophe TREFOIS 
> wrote:
Small add.

Shouldnt one update the engine first ?

Nope.
You should always update the hosts first. The other way around can work but 
AFAIK this is what is being tested.


--
Barak Korren
bkor...@redhat.com
RHEV-CI Team

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Re: [ovirt-users] Upgrade datacenter from 3.6 to 4.0

[Barak Korren]

On 23 August 2016 at 19:09, Christophe TREFOIS 
wrote:

> Small add.
>
> Shouldnt one update the engine first ?
>

Nope.
You should always update the hosts first. The other way around can work but
AFAIK this is what is being tested.


-- 
*Barak Korren*
bkor...@redhat.com
RHEV-CI Team
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Re: [ovirt-users] Upgrade datacenter from 3.6 to 4.0

[Christophe TREFOIS]

Small add.

Shouldnt one update the engine first ?

--

Dr Christophe Trefois, Dipl.-Ing.
Technical Specialist / Post-Doc

UNIVERSITÉ DU LUXEMBOURG

LUXEMBOURG CENTRE FOR SYSTEMS BIOMEDICINE
Campus Belval | House of Biomedicine
6, avenue du Swing
L-4367 Belvaux
T: +352 46 66 44 6124
F: +352 46 66 44 6949
http://www.uni.lu/lcsb

[Facebook]  [Twitter] 
   [Google Plus] 
   [Linkedin] 
   [skype] 



This message is confidential and may contain privileged information.
It is intended for the named recipient only.
If you receive it in error please notify me and permanently delete the original 
message and any copies.




On 23 Aug 2016, at 14:28, Barak Korren 
> wrote:


The following process worked for me:
1. ensure all hosts are running el7 or above, and all clusters had been 
upgraded to 3.6 level
2. upgrade vdsm to 4.x on all hosts (assuming you are not using ovirt-node) by 
switching to maintainance upgrading and activating one by one to avoid VM 
downtime.
3. Upgrade engine by following one of the documented procedures (we just 
inatalled a new machine for it and switched DNS after backup/restore).
4. Once satisfied that illing back to 3.6 engine will not be needed - upgrade 
cluster level.

בתאריך 23 באוג׳ 2016 12:43,‏ "Arnaud Lauriou" 
> כתב:
Hi,

What is the best way to upgrade a datacenter from ovirt 3.6 to 4.0 ?
Upgrade engine, hosts then cluster ?
If right, how do you upgrade a host running ovirt 3.6.7 ? Simple upgrade or 
fresh install ?
During the update process of a cluster, some hosts will be in 3.6.7 and others 
in 4.0.2, is it a problem for migrating VMs ?

Found docs about engine upgrade but not a lot about host and cluster.

Thanks,

Arnaud
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Re: [ovirt-users] Upgrade datacenter from 3.6 to 4.0

[Barak Korren]

The following process worked for me:
1. ensure all hosts are running el7 or above, and all clusters had been
upgraded to 3.6 level
2. upgrade vdsm to 4.x on all hosts (assuming you are not using ovirt-node)
by switching to maintainance upgrading and activating one by one to avoid
VM downtime.
3. Upgrade engine by following one of the documented procedures (we just
inatalled a new machine for it and switched DNS after backup/restore).
4. Once satisfied that illing back to 3.6 engine will not be needed -
upgrade cluster level.

בתאריך 23 באוג׳ 2016 12:43,‏ "Arnaud Lauriou"  כתב:

> Hi,
>
> What is the best way to upgrade a datacenter from ovirt 3.6 to 4.0 ?
> Upgrade engine, hosts then cluster ?
> If right, how do you upgrade a host running ovirt 3.6.7 ? Simple upgrade
> or fresh install ?
> During the update process of a cluster, some hosts will be in 3.6.7 and
> others in 4.0.2, is it a problem for migrating VMs ?
>
> Found docs about engine upgrade but not a lot about host and cluster.
>
> Thanks,
>
> Arnaud
> ___
> Users mailing list
> Users@ovirt.org
> http://lists.ovirt.org/mailman/listinfo/users
>
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[ovirt-users] Upgrade datacenter from 3.6 to 4.0

[Arnaud Lauriou]

Hi,

What is the best way to upgrade a datacenter from ovirt 3.6 to 4.0 ?
Upgrade engine, hosts then cluster ?
If right, how do you upgrade a host running ovirt 3.6.7 ? Simple upgrade 
or fresh install ?
During the update process of a cluster, some hosts will be in 3.6.7 and 
others in 4.0.2, is it a problem for migrating VMs ?


Found docs about engine upgrade but not a lot about host and cluster.

Thanks,

Arnaud
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