Open Stack

On Thu, Dec 13, 2018 at 06:48:10PM -0500, Erik McCormick wrote:
: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?
:>

: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.

My bets are on this one, it's the sort of thing I do anyway. An
`openstack server reboot --hard` should also recreate the VM inplace
with new config settings I think.

you can double check that the instance you are trying to move has the
correct CPU setting by looking at the libvirt XML, either in:

/var/lib/nova/instances/<instance uuid>/libvirt.xml

or dumping libvirt's info on running VM:

virsh dumpxml <virt instance-name>

what you don't want to see is:

  <cpu mode="host-passthrough" match="exact">

This is what I use and just live with somewhat complex mappings of
what will move where because my user want all thw feature they can
get.  So I'm not 100% sure what you wnat to see here, but I know it's
not that.

-Jon