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

11 Mar 2013


      ----- Original Message -----
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From: "Patrick Hurrelmann" <patrick.hurrelmann@lobster.de>
To: "users" <users@ovirt.org>
Cc: "Omer Frenkel" <ofrenkel@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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