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<p>​Actually it works great! It's been supported by KVM for a while now. I had one Proxmox cluster with a mix of AMD and Intel and migrated KVM VM's between them frequently. OpenStack (KVM) and VMWare support this as well.<br>
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<p>The trick is to expose a virtual CPU with a common set of features to the VMs. KVM handles the rest. From the KVM FAQ:<br>
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<p><a href="http://www.linux-kvm.org/page/FAQ#Does_KVM_support_live_migration_from_an_AMD_host_to_an_Intel_host_and_back.3F">http://www.linux-kvm.org/page/FAQ#Does_KVM_support_live_migration_from_an_AMD_host_to_an_Intel_host_and_back.3F</a><br>
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<p>"<span style="font-size: 12pt;">Does KVM support live migration from an AMD host to an Intel host and back?</span></p>
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Yes. There may be issues on 32-bit Intel hosts which don't support NX (or XD), but for 64-bit hosts back and forth migration should work well. Migration of 32-bit guests should work between 32-bit hosts and 64-bit hosts. If one of your hosts does not support
NX, you may consider disabling NX when starting the guest on a NX-capable system. You can do it by passing "-cpu qemu64,-nx" parameter to the guest."
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<div class="PlainText">--<br>
Matthew Trent</div>
<div class="PlainText">Network Engineer<br>
Lewis County IT Services</div>
<div class="PlainText">360.740.1247 - Helpdesk<br>
360.740.3343 - Direct line</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Yaniv Kaul <ykaul@redhat.com><br>
<b>Sent:</b> Tuesday, February 2, 2016 2:17 PM<br>
<b>To:</b> Matthew Trent<br>
<b>Cc:</b> users@ovirt.org<br>
<b>Subject:</b> Re: [ovirt-users] Mixing CPU types</font>
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<div class="gmail_quote">On Mon, Feb 1, 2016 at 9:13 PM, Matthew Trent <span dir="ltr">
<<a href="mailto:Matthew.Trent@lewiscountywa.gov" target="_blank">Matthew.Trent@lewiscountywa.gov</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex; border-left:1px #ccc solid; padding-left:1ex">
Though our new oVirt setup is better in most ways, cross-CPU-type migration is one of the features I miss from Proxmox. KVM supports mixed-CPU migration for a while now, even between AMD and Intel.<br>
<br>
<a href="http://www.linux-kvm.org/page/Migration" rel="noreferrer" target="_blank">http://www.linux-kvm.org/page/Migration</a></blockquote>
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<div>I highly doubt the above works in real life scenarios. </div>
<div>Y.<br>
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I'm using a bunch of re-purposed servers with a mix of AMD and Intel. I separate them into clusters, as noted, but it sure would be nice to be able to live migrate between them. :)<br>
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--<br>
Matthew Trent<br>
Network Engineer<br>
Lewis County IT Services<br>
<span class="im HOEnZb"><br>
> Hi Rene,<br>
><br>
> Thank you very much for coming back to me.<br>
><br>
> That's perfect then and answers my questions exactly.<br>
><br>
> Much appreciated.<br>
><br>
> Regards.<br>
><br>
>Neil Wilson.<br>
><br>
><br>
</span>
<div class="HOEnZb">
<div class="h5">>On Wed, Jan 27, 2016 at 1:57 PM, René Koch <rkoch at <a href="http://rk-it.at" rel="noreferrer" target="_blank">
rk-it.at</a>> wrote:<br>
>><br>
>> Hi Neil,<br>
>><br>
>> You can mix cpu types (but not AMD and Intel) if you leave the cluster<br>
>> level at the lowest cpu level.<br>
>> I personally don't mix cpu levels if possible, but instead create own<br>
>> clusters for each cpu type in order to be able to use the newest cpu<br>
>> features...<br>
>><br>
>><br>
>> Regards,<br>
>> René<br>
>><br>
>><br>
>> On 01/27/2016 12:53 PM, Neil wrote:<br>
>><br>
>> Hi guys,<br>
>><br>
>> I currently have an oVirt 3.5 cluster with Sandy Bridge Xeon CPU's, and I<br>
>> need to add a new host for more RAM and vCPU's, however the new Xeon e5<br>
>> cpu's are Haswell based.<br>
>><br>
>> Can I mix CPU types (Haswell and Sandy Bridge) in my cluster and will I be<br>
>> able to migrate between my hosts?<br>
>><br>
>> I'm guessing that for this to work I'll need to leave my "CPU type" set to<br>
>> Sandy Bridge, will the Haswell based CPU be compatible with my cluster, but<br>
>> just run without any Haswell type features?<br>
>><br>
>> Apologies if this is a dumb question or if it's been answered before.<br>
>><br>
>> Thank you.<br>
>><br>
>> Regards.<br>
>><br>
>> Neil Wilson<br>
>><br>
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