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Cannot add second vNIC to Hyper-V virtualized guest

Posted on 2014-09-07
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Last Modified: 2014-11-12
Using VMM and clustered 2012R2 Hyper-V hosts.

The virtualized guest machine is also the VMM server in our environment.

1. I try to add a vNIC via VMM to the guest machine, but that is not possible when it is turned on.
2. I turn it off, and try to add a vNIC to the guest machine via the Hyper-V manager on the host where the VM is running. This is not possible due to the error below:
Error"Some settings cannot be modified because the virtual machine is clustered. To modify a setting that is unavailable, use the Faileover Cluster Manager."
3. I install the Failover Cluster Manager on the host and connect to the cluster it is a part of, but I can't see any option there to configure the VM guests vNIC and virtual hardware(as I expected).

So I am stuck. How is this done?
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Question by:itnifl
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Expert Comment

by:Shabarinath Ramadasan
ID: 40309267
As far as I know, HotAdd of Virtual network interface is not yet supported on Hyper-V. You can only change the interface configuration while the VM is On.

Have a look on what all are supported as HotAdd in Hyper-V.

http://blogs.technet.com/b/kevinremde/archive/2013/03/05/you-want-to-hot-add-what-20-days-of-server-virtualization-part-2-of-20.aspx

Cheers!
Shaba
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by:itnifl
ID: 40309274
So there is no way for me to add the second vNIC? I really need one. I have already tried to turn off the VM, but then I don't have a VMM server to connect to because it is the VMM server. Using the Hyper-V manager on the host doesn't work.
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Expert Comment

by:Shabarinath Ramadasan
ID: 40309282
You could add if the VM is OFF.
Go to failover manager -> Right click on the VM -> Settings -> Add Hardware -> Network Adapter

Let me know if you have any challenge on this.

Cheers.
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Accepted Solution

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Shabarinath Ramadasan earned 500 total points
ID: 40309284
Once the VM is added to Failover Cluster, majority of the changes related with the configuration will be available only through Failover Cluster Manager. If its a standalone node, Hyper-V Manager could handle all such changes.
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Author Closing Comment

by:itnifl
ID: 40309345
Yes, you are right about that. I looked too quickly when looking through the 'Failover Cluster Manager.' I found the VM via <ClusterName>->Nodes->SCVMM <VMName>. I added the vNIC there after turning the VM off. Then booted it, connected to it as the VMM server with the VMM console, and configured the vNIC to my liking.
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