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Yellow bang in device manager if SR-IOV NIC is moved to noncapable slot on Windows Server 2012

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Symptoms

On some SR-IOV capable platforms, some slots are SR-IOV capable, while others are not. If SR-IOV is enabled on a network adapter while inserted into one of the working slots and a virtual switch is created with SR-IOV enabled, the connection will function correctly. However, if the network adapter is then removed from the working slot and placed into a non-SR-IOV capable slot, the driver will fail to load and the device status within Device Manager will indicate a yellow bang error Code 10.

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Cause

When the network adapter is moved to a different slot, Server 2012 recognizes the same NIC device serial number and attempts to initialize the SR-IOV feature when the driver starts. However, this fails since the slot does not support SR-IOV. When this happens, the driver cannot automatically detect that SR-IOV is not functional and tries to enable SR-IOV. This causes the driver load to fail and an error status is indicated in Device Manager. 

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Resolution

There are three workarounds that are available to correct the device error reported by Device Manager:
- Go to the Advanced settings for the NIC driver and disable SR-IOV. This can be found under the Network and Sharing Center by choosing "Change adapter settings". Right-click on the connection and choose Properties, then choose Configure, and then choose the Advanced settings folder.
or
- Within Virtual Switch Manager, remove the Hyper-V virtual switch that is bound to this device and recreate it.
or
- Move the network adapter back into an SR-IOV capable slot

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Keywords: kb

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Article Info
Article ID : 2756208
Revision : 1
Created on : 1/7/2017
Published on : 9/12/2012
Exists online : False
Views : 345