Did you know that configuration changes for Hyper-V replicated virtual machines do not automatically synchronize? Read on for how to keep your changes in sync.

Updating Virtual Machine Configuration Settings

First, you have your virtual guest replicating to another Hyper-V server.  Maybe you have a virtual guest also replicated to another server using extended replication.  However, any changes to the virtual machine configuration settings are not replicated to the other replicas.  The bottom line is, the only time the guest configuration settings synchronize is during the initial replication setup.

Any time you update the primary virtual machine, you will need to configure those same changes on your replica and extended replica virtual machines.  Consequently, this step is crucial in any change management process.

Here are a few examples:

  • CPU changes
  • Memory changes
  • Automatic Start/Stop actions

MAC Address based Licensing

Another consideration is MAC address based licensing.  There are several vendors of virtual appliances that license their product to a particular MAC address. By default, virtual guests are set to a dynamic address configuration.

To make the MAC the same on each replica follow these steps:

    1. Change the primary virtual guest to static using the previously assigned address .
    2. Make note of the MAC address and set the replicas to static using the same MAC address.

As a result, if you need to failover one of the appliances it will have the same MAC address as the primary guest when it was running.

This is just one topic of many relating to setting up and configuring a Hyper-V server.  To learn more about what Peters & Associates IT Infrastructure Services can do for you, call us at 630.832.0075 or email us info@peters.com.