[Users] 6.4 CR: oVirt 3.1 breaks with missing cpu features after update to CentOS 6.4 (6.3 + CR)

[Omer Frenkel]

----- Original Message -----
> From: "Patrick Hurrelmann" <patrick.hurrelmann at lobster.de>
> To: "users" <users at ovirt.org>
> Cc: "Omer Frenkel" <ofrenkel at redhat.com>
> Sent: Monday, March 11, 2013 11:39:46 AM
> Subject: Re: [Users] 6.4 CR: oVirt 3.1 breaks with missing cpu features after update to CentOS 6.4 (6.3 + CR)
> 
> >> Alright, just verified it. A vm started on a 6.3 host can be
> >> successfully migrated to the new 6.4 host and then back to any
> >> other 6.3
> >> host. It just won't migrate a vm started on 6.4 to any host
> >> running 6.3.
> > 
> > This surprises me. Engine should have used the same emulatedMachine
> > value, independent of the initial host. Could you share the
> > vdsm.log
> > lines mentionioning "emulatedMachine" in both cases?
> > 
> > Dan.
> 
> Hi Dan,
> 
> sorry for coming back this late. I checked it and the default
> emulatedMachine is pc. And machine pc differs in the definition
> between
> 6.3 and 6.4.

the value sent to vdsm from the engine is configurable per cluster compatibility version,
no reason for it to be 'pc' anywhere, you can use engine-config to change EmulatedMachine to the correct value (for 3.2 cluster probably you need to use 'rhel6.3.0')

> 
> virsh 6.3:
>   <guest>
>     <os_type>hvm</os_type>
>     <arch name='x86_64'>
>       <wordsize>64</wordsize>
>       <emulator>/usr/libexec/qemu-kvm</emulator>
>       <machine>rhel6.3.0</machine>
>       <machine canonical='rhel6.3.0'>pc</machine>
>       <machine>rhel6.2.0</machine>
>       <machine>rhel6.1.0</machine>
>       <machine>rhel6.0.0</machine>
>       <machine>rhel5.5.0</machine>
>       <machine>rhel5.4.4</machine>
>       <machine>rhel5.4.0</machine>
>       <domain type='qemu'>
>       </domain>
>       <domain type='kvm'>
>         <emulator>/usr/libexec/qemu-kvm</emulator>
>       </domain>
>     </arch>
>     <features>
>       <cpuselection/>
>       <deviceboot/>
>       <acpi default='on' toggle='yes'/>
>       <apic default='on' toggle='no'/>
>     </features>
>   </guest>
> 
> 
> virsh 6.4:
>   <guest>
>     <os_type>hvm</os_type>
>     <arch name='x86_64'>
>       <wordsize>64</wordsize>
>       <emulator>/usr/libexec/qemu-kvm</emulator>
>       <machine>rhel6.4.0</machine>
>       <machine canonical='rhel6.4.0'>pc</machine>
>       <machine>rhel6.3.0</machine>
>       <machine>rhel6.2.0</machine>
>       <machine>rhel6.1.0</machine>
>       <machine>rhel6.0.0</machine>
>       <machine>rhel5.5.0</machine>
>       <machine>rhel5.4.4</machine>
>       <machine>rhel5.4.0</machine>
>       <domain type='qemu'>
>       </domain>
>       <domain type='kvm'>
>         <emulator>/usr/libexec/qemu-kvm</emulator>
>       </domain>
>     </arch>
>     <features>
>       <cpuselection/>
>       <deviceboot/>
>       <acpi default='on' toggle='yes'/>
>       <apic default='on' toggle='no'/>
>     </features>
>   </guest>
> 
> Regards
> Patrick
> 
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