VMM and Cluster Virtual Networks
There have been some questions regarding the correct configuration for Virtual Networks and clusters in SCVMM 2008. So here is how the networks should be set in a cluster and how this helps migrating VMs within the cluster.
To be able to use a Virtual Network in a node that belongs to a cluster, the configuration must meet these 3 conditions:
- The Name of the Virtual Network must be the same in all the nodes of the cluster
- The Tag of the Virtual Network must be the same in all the nodes of the cluster
- Just for external Virtual Networks:
- The location of the NIC attached to the Virtual Network must be the same in all the nodes of the cluster
If your configuration meet these 3 conditions you will be able to use your Virtual Network for your HA VMs.
If you have your VM connected to a Virtual Network in one node that does not meet these conditions your VM will go into unsupported cluster configuration and you need to either disconnect the VM from that Virtual Network by choosing the option 'Repair'. OR you can fix the configuration issue with your Virtual Network and then refresh the cluster to make sure the changes have been applied
Q. What happens when I migrate a VM within the cluster? (Quick migration or Live Migration for Win2k8 R2)
A. Each NIC of the VM will be connected to the equivalent Virtual Network on the destination node. This is the Virtual Network with the same Name, location and tag on the destination Host.
Q. What If I'm moving the VM to another cluster or a standalone host outside of the cluster?
A. When moving a VM in or out a cluster the the normal conditions are applied. This is: Network location and tag are used to deterine the right Virtual Network in the destination host to use.