Open Stack

Hi,

When trying to live-migrate between two distinct CPUs, I kind of expect
there to be issues. Which is why openstack supports the "cpu_mode=custom",
"cpu_model=MODELNAME" flags for libvirt.

When I set those to some Lowest Common Denominator (and restart
everything), I still git the issue. I've set both systems to SandyBridge
and tested as well as Conroe. The actual CPUs are Ivy Bridge and Haswell
(newer than SandyBridge and supersets thereof.)

The Older->Newer migration works fine (even without setting a cpu_model)
but the newer to older never works.

Specfics:
OpenStack Juno.2
LibVirt: 1.2.2

Older: model name : Intel(R) Xeon(R) CPU E5-2650 v2 @ 2.60GHz (Ivy Bridge)
Newer: model name : Intel(R) Xeon(R) CPU E5-2650 v3 @ 2.30GHz (Haswell)

And to clarify: the nova-compute error is the subject line:

2015-07-09 17:55:02.485 8651 ERROR oslo.messaging._drivers.common
[req-48a16da3-41e0-43ee-99c8-43d178273101 ] ['Traceback (most recent call
last):\n', '  File
"/usr/lib/python2.7/dist-packages/oslo/messaging/rpc/dispatcher.py", line
134, in _dispatch_and_reply\n    incoming.message))\n', '  File
"/usr/lib/python2.7/dist-packages/oslo/messaging/rpc/dispatcher.py", line
177, in _dispatch\n    return self._do_dispatch(endpoint, method, ctxt,
args)\n', '  File
"/usr/lib/python2.7/dist-packages/oslo/messaging/rpc/dispatcher.py", line
123, in _do_dispatch\n    result = getattr(endpoint, method)(ctxt,
**new_args)\n', '  File
"/usr/lib/python2.7/dist-packages/nova/exception.py", line 88, in wrapped\n
   payload)\n', '  File
"/usr/lib/python2.7/dist-packages/nova/openstack/common/excutils.py", line
82, in __exit__\n    six.reraise(self.type_, self.value, self.tb)\n', '
 File "/usr/lib/python2.7/dist-packages/nova/exception.py", line 71, in
wrapped\n    return f(self, context, *args, **kw)\n', '  File
"/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 331, in
decorated_function\n    kwargs[\'instance\'], e, sys.exc_info())\n', '
 File "/usr/lib/python2.7/dist-packages/nova/openstack/common/excutils.py",
line 82, in __exit__\n    six.reraise(self.type_, self.value, self.tb)\n',
'  File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line
319, in decorated_function\n    return function(self, context, *args,
**kwargs)\n', '  File
"/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 4860, in
check_can_live_migrate_destination\n    block_migration,
disk_over_commit)\n', '  File
"/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 4999,
in check_can_live_migrate_destination\n
 self._compare_cpu(source_cpu_info)\n', '  File
"/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 5177,
in _compare_cpu\n    raise exception.InvalidCPUInfo(reason=m % {\'ret\':
ret, \'u\': u})\n', "InvalidCPUInfo: Unacceptable CPU info: CPU doesn't
have compatibility.\n\n0\n\nRefer to
http://libvirt.org/html/libvirt-libvirt.html#virCPUCompareResult\n"]

The nova client reports:
dmbp:~ dmedberry$ nova live-migration 7181cea1-ebbf-4f05-9316-80eef0216648
ERROR (BadRequest): No valid host was found.  (HTTP 400) (Request-ID:
req-48a16da3-41e0-43ee-99c8-43d178273101)

Daniel, Operators? Ring any bells? Any ideas?

-d
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