Hyper-V Guest VM NIC goes offline during VSS Snapshot

Gary Dewrell
Gary Dewrell used Ask the Experts™
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I have a single stand alone Hyper-V Box (Server 2008 R2 Enterprise) at a remote office that has two VMs. Both are Server 2008 R2 VMs.

Each night my backup software does a VSS Snapshot of the Hyper-V Host. During this process only one of the VMs virtual NIC goes offline.

Get an Event ID 10: The miniport 'Microsoft Virtual Machine Bus Network Adapter #2' disconnected.

Followed 10 minutes later by a Even ID 9:
The miniport 'Microsoft Virtual Machine Bus Network Adapter #2' connected.

This issue is isolated to this one VM on this one Hyper-V host.
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IT Manager
Commented:
It behaves as if the Integration services were missing or as it was connected to Legacy Network adapter. Check the Integration services first (reinstall them if you suspect that they are not up to date).  

Then if the problem persists, I would recommend recreating the virtual network adapter:

  1. Shutdown the VM
  2. Change the VM settings to disconnect its network adapter from the virtual switch/virtual adapter
  3. Using Virtual Network Manager, remove the problematic adapter and add it again. Make sure the “Allow management OS to share this adapter” is not selected if that sharing is not needed.
  4. Change the VM to reconnect its NIC back to the newly created virtual adapter
Gary DewrellSenior Network Administrator

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Commented:
Thanks Svet, I will have to do this after hours. Will let you know how it turns out.
Gary DewrellSenior Network Administrator

Author

Commented:
Svete that was not the resolution. But since you are the only one that replied you get the points.

The resolution was found by Tech Support and had something to do with running out of space in the volume snapshots directory.
Gary DewrellSenior Network Administrator

Author

Commented:
Thanks Svet

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