No warning logged when the Storport miniport driver tries to use more than 8 SCSI buses in Windows Server 2008 R2

Applies to: Windows Server 2008 R2 DatacenterWindows Server 2008 R2 EnterpriseWindows Server 2008 R2 Foundation More


To identify incompatibilities between Windows Server 2008 R2 and storage controllers that were designed for Windows Server 2012, an update is available that will log the following warning message in Event Viewer:

This Storport miniport driver is trying to use more than 8 SCSI buses. This exceeds the supported maximum on this operating system. Please contact your storage controller manufacturer to determine whether this device and driver is designed to work on this operating system.

This warning message will be logged when the system is started and the Storport miniport driver detects that the storage controller is trying to use more than the maximum number of supported buses. For Windows Server 2008 R2 and earlier versions of Windows, 8 is maximum number of supported buses.

If you see this warning message being logged, see the documentation from the storage controller vendor to make sure that this hardware is supported for Windows Server 2008 R2.

More Information

Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing the problem described in this article. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, go to the following Microsoft website: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.


To apply this hotfix, you must be running Service Pack 1 for Windows Server 2008 R2.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any previously released hotfix.


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.