HYPERV live migration between 2 differents intel processor failed

Matthieu OLLIVIER 5 Reputation points


I have a cluster with 4 hyper V.

I have 2 servers with a GenuineIntel Intel64 Family 6 Model 85 Stepping 4 processor,

and the 2 others with GenuineIntel Intel64 Family 6 Model 85 Stepping 7 processor.

Since i migrated my hyperV servers from 2016 to 2019, the live migration between the servers with differents processors failed. (error 21502).

The compatibility box is checked.

I would like some help.


A Windows technology providing a hypervisor-based virtualization solution enabling customers to consolidate workloads onto a single server.
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  1. Limitless Technology 27,101 Reputation points

    Hi. Thank you for your question and reaching out. I’d be more than happy to help you with your query

    It appears that you are having difficulty performing a live migration between the servers with different GenuineIntel Intel64 Family 6 Model 85 processors. This is likely due to the fact that the two processors have different stepping numbers (4 vs. 7). Since the two processors are not completely compatible, the live migration will fail. To work around this issue, you may be able to enable processor compatibility mode in the Hyper-V settings. This will allow the live migration to go through, but with a potential performance penalty. Alternatively, you can try using a third-party tool such as Microsoft Virtual Machine Converter to perform the migration.

    If the reply was helpful, please don’t forget to upvote or accept as answer, thank you.

  2. Matthieu OLLIVIER 5 Reputation points


    The processor compatibilty mode is enabled on each VM, and the cold migration is working.


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  3. Matthieu OLLIVIER 5 Reputation points


    Any answers ?

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  4. Alex Korolev 0 Reputation points

    I have the same ussue with DELL R440 and R650 on WS2022 Datacenter

    Intel64 Family 6 Model 85 Stepping 4 Intel(R) Xeon(R) Silver 4110 CPU @ 2.10GHz

    Intel64 Family 6 Model 106 Stepping 6 Intel(R) Xeon(R) Silver 4316 CPU @ 2.30GHz

    BIOS settings are completely the same.

    CPU copmatibility for live migration set for the vm.

    Migration could be done in both directions, once VM started on 4110

    In case VM started on 4316 it will not move to 4110, but will migrate to 4316.

    Comapre-VM reponces with Incompatibilities : {21026, 24004} without additional info.

    Any help will be apppreciated.

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  5. Matthieu OLLIVIER 5 Reputation points

    Any help ?

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