[ovirt-users] Advise needed: building cheap HA oVirt cluster with just 2 physical servers

[Eduardo Mayoral]

Exporting the VMs to an export storage domain on the first server,
copying the files to another export storage domain on the second server
and importing it should work. What kind of problem did you find?

As for the order of doing things, my first oVirt lab was a 3-node setup
with gluster (oVirt version 4.0). I found this guide helpful:

https://www.ovirt.org/blog/2016/08/up-and-running-with-ovirt-4-0-and-gluster-storage/

I see there is a new version of it:

https://www.ovirt.org/blog/2017/04/up-and-running-with-ovirt-4.1-and-gluster-storage/

If I understand correctly you plan to re-use the server you already
have. I think you will probably find it much easier have to export your
VMs, re-deploy and import your VMs back. It means some downtime, but you
seem very constrained on the hardware available and there is not much
room to manouver...

Good luck!

Eduardo Mayoral Jimeno (emayoral at arsys.es)
Administrador de sistemas. Departamento de Plataformas. Arsys internet.
+34 941 620 145 ext. 5153

On 03/11/17 08:39, Artem Tambovskiy wrote:
> Thanks Eduardo!
>
> I think I can find a third server to build a glusterFS storage. So the
> first step will be to install a self-hosted engine on the new server
> and start building a glusterFS storage. IS there any easy way to
> migrate existing 5 VM's running on the second bare-metal oVirt host,
> right? I found a little bit tricky moving oVirt backups between the
> hosts (at least I failed to replicate the existing VM's on the second
> server).
>
> Regards,
> Artem
>
>
>
> On Fri, Nov 3, 2017 at 10:24 AM, Eduardo Mayoral <emayoral at arsys.es
> <mailto:emayoral at arsys.es>> wrote:
>
>     For HA you will need some kind of storage available to all the
>     compute nodes in the cluster. If you have no external storage and
>     few nodes, I think your best option for storage is gluster , and
>     the minimum number of nodes you will need for HA is 3 (the third
>     gluster node can be metadata-only, but you still need that third
>     node to give you quorum, avoid split-brains and have something
>     that you can call "HA" with a straight face.
>
>     Eduardo Mayoral Jimeno (emayoral at arsys.es <mailto:emayoral at arsys.es>)
>     Administrador de sistemas. Departamento de Plataformas. Arsys internet.
>     +34 941 620 145 ext. 5153 <tel:+34%20941%2062%2001%2045>
>
>     On 03/11/17 08:10, Artem Tambovskiy wrote:
>>     Looking for a design advise on oVirt provisioning. I'm running a
>>     PoC lab on single bare-metal host (suddenly it was setup with
>>     just Local Storage domain) and 
>>     no I'd like to rebuild the setup by making a cluster of 2
>>     physical servers, no external storage array available. That are
>>     the options here? is there any options to build cheap HA cluster
>>     with just 2 servers? 
>>
>>     Thanks in advance!
>>
>>     Artem
>>
>>
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