Should Hyper-V replication carry changes to underlying VM settings, such as increasing memory, adding a vCPU, or in this specific case, adding a NIC?

I'm running Server 2016 Datacenter edition and Hyper-V replication is via Failover Cluster Manager and a replication broker. I added a NIC to two VM's this morning, verified that replication is working, and the replica's do not have the new NIC after a half-hour and multiple successful replication cycles.

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    I've just confirmed same behaviour on a lab. I cannot give you a definite answer if there's a way to replicate VM settings. Looking back on the replication wizard, it mentions only Choose replication VHDs; it can be a hint that that's all replicated.
    – Krackout
    Oct 28, 2020 at 11:37

1 Answer 1


I also verified this behaviour in lab.

The documentation about hyper-v replica says :

When you enable Hyper-V Replica for a specific virtual machine, initial replication creates an identical replica virtual machine on a secondary host server. After that happens, Hyper-V Replica change tracking creates and maintains a log file that captures changes on a virtual machine VHD.

In short, when the initial replication starts it will create a replica virtual machine with identical settings, but after that only the changes made on the virtual hard disk are replicated.

Furthermore, the only way i see to replicate the VM hardware changes like cpu, memory is to Remove Replication on the source hyper v host and delete the replica VM on the destination hyper v host, and then configure replication again.

Documentation about hyper-v replica : https://docs.microsoft.com/en-us/windows-server/virtualization/hyper-v/manage/set-up-hyper-v-replica

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