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On Thu, Dec 13, 2018 at 5:37 PM Torin Woltjer
<torin.woltjer at granddial.com> wrote:
>
> Having issues getting live migrations to functions between two compute nodes.
> One is an Opteron G4 and the other is an Opteron G5. I can migrate from the G4 to the G5 just fine. When I try to migrate an instance from the G5 node to the G4 node I get an error message:
> InvalidCPUInfo: Unacceptable CPU info: CPU doesn't have compatibility.
> This is despite having the following setting in my /etc/nova/nova.conf on the G5 machine.
>
> [libvirt]
> cpu_mode = custom
> cpu_model = Opteron_G4
>
> Is this not the setting I'm looking for? What can I do to make this work?
>

Generally, yes this should do the trick. So long as the lowest common
set of features is used, then you should be able to live migrate. You
can do a diff on the feature set of each host CPU with: virsh
capabilities

Did you create the instances you are trying to migrate after you
applied the setting? If not, do a cold migrate and then try the live
one again.

Did you apply the setting on both computes? I know this maybe is
obvious, but I've seen people put it on the controllers and not the
computes and wonder why it wasn't working. Doesn't hurt to ask :).



>
> Torin Woltjer
>
> Grand Dial Communications - A ZK Tech Inc. Company
>
> 616.776.1066 ext. 2006
> www.granddial.com

-Erik