[Users] oVirt-engine Migration Docs

[Itamar Heim]

On 09/06/2012 03:58 PM, Neil wrote:
> Hi guys,
>
> I've read the following regarding upgrading from 3.0 to 3.1...
>
>   "Due to the nature of this upgrade, we DO NOT recommend it, users are
> advised to do a 3.1 clean installation, and to import all VM's and
> template into the new installation."
>
> I'm running a live ovirt-engine(very early 3.1 release with no upgrade
> path) system with 3 VM's and I'd like to do the recommended -- "clean
> installation and import all VM's and template", but I'd like to know
> if there are any detailed guides on how to do this?
>
> I also have an unused server that I can use as a spare host that I can
> add into my clean engine install to get the VDSM onto the latest
> version as well, but how do you go about exporting and importing the
> VM's and the template?
>
> I am working on a live system and downtime needs to be limited, not
> sure if this is the correct procedure?
>
> Prepare old engine:
> 1.) Create a export storage domain
> 2.) Suspend each VM and export (presume suspending is enough and they
> don't need to be shutdown?)

I'm pretty sure they need to be in 'down' state for export.

> 3.) Detach export storage domain
>
> Prepare new engine machine:
> 1.) Install new ovirt-engine
> 2.) "Restore previous keystore and preserve .sh scripts" presume this
> is how the configs and DB are restored?

edit dns entry to point to new engine?
backup the db on source engine and restore on new engine.

> 3.) Log into ovirt as admin and add only the spare host (to ensure
> that VDSM 4.10 is used, because I'm currently using VDSM 4.9)
> 4.) Attach export storage domain

you need to detach it from first engine.

> 5.) Import VM's all running on new "spare" host
>
> Upgrade old VDSM hosts:
> 1.) Remove VDSM 4.9 on old hosts(2 of them)?
> 2.) Add/install the new hosts from inside webadmin to get the old
> hosts up to VDSM 4.10?
>
> I'll gladly document the steps in detail if there is no detailed guide
> already for this.
>
> Thanks, any assistance is greatly appreciated.
>
> Regards.
>
> Neil Wilson.
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