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error when live migrating. computes node with different CPUs

asked 2015-04-12 07:33:02 -0500

AlonFre gravatar image

Hi all,

we are trying to live migrate a VM between two Compute nodes. after looking for this problem on this site, we understand that it's related to the fact that the two compute nodes have different CPUs. the problem appears only one way, which means that live migration from compute-2 to compute-1 works good, but live migration from compute-1 to compute-2 does not works.

this is the error that we get when trying to migrate from compute-1 to compute-2:

2015-04-12 15:03:49.590 22634 ERROR oslo.messaging._drivers.common [req-2407f9e2-c89e-4e99-9909-e2bb6269b919 ] Returning exception Unacceptable CPU info: CPU doesn't have compatibility.

we had tried several solution, but the problem did not solved. we first tried setting cpu_model = None on the nova.conf. and later reconfigure it to:


but without success.

Do you have any suggestions? Thanks in advance, Alon.

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as a workaround, we also tried modifying the code according to the answer to this question: but without success... please advice.

AlonFre gravatar imageAlonFre ( 2015-04-14 06:28:50 -0500 )edit

1 answer

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answered 2015-04-17 10:57:42 -0500

Poonam Agarwal gravatar image

This is a known problem and has been fixed in kilo The patches are needed on files nova/tests/unit/virt/libvirt/ & nova/virt/libvirt/

Refer the links below for more information

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Thanks! can you please also elaborate, how to install the patches on the compute nodes? should i just replace the the .py files?

AlonFre gravatar imageAlonFre ( 2015-04-27 10:10:25 -0500 )edit

when trying to replace the file, the nova-compute service failed to start. any suggestions? thanks!

AlonFre gravatar imageAlonFre ( 2015-04-27 11:35:31 -0500 )edit

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Asked: 2015-04-12 07:33:02 -0500

Seen: 2,292 times

Last updated: Apr 17 '15