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Hyper-V virtual machine versions after host OS upgrade from Server 2012R2 to 2019

Hi

Looking for advice on how virtual machine versions are handled during a host upgrade from Windows Server 2012r2 to Server 2019. The setup is as follows:

Production Site - 2 x Windows Server 2012 R2 hosts with Hyper-V Cluster

DR Site - 1 x Windows Server 2012 R2 host with Hyper-V configured as replica server.

The customer wish to upgrade the the 2 production hosts from Server 2012R2 to 2019 but leave the DR replica server running on Server 2012R2.

When upgrading the OS to 2019, will the virtual machine versions stay at 5.0 or are they automatically upgraded? Need confirmation on this as if the versions are auto upgraded then the OS would also need upgraded to 2019 to ensure the virtual machines versions
are the same.

Thanks in advance

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