The Physical Disk resource for a Cluster Shared Volume may not come online during backup

Applies to: Windows Server 2012 DatacenterWindows Server 2012 DatacenterWindows Server 2012 Essentials More

Important The hotfix that corresponds to KB 2869923 has been included with the hotfix KB 2878635, which contains all fixes that were previously included in KB 2869923.

Symptoms


Consider the following scenario:

  • You configure a Windows Server 2012-based Hyper-V failover cluster that uses Cluster Shared Volumes (CSV).
  • The VHD or VHDX files reside on the Cluster Shared Volume.
  • Backups of the Cluster Shared Volume are performed by using software snapshots.
  • The Physical Disk resource for the Cluster Shared Volume is moved to another node in the cluster.
In this scenario, the Physical Disk resource may not come online if the backup of the Cluster Shared Volume is in progress. Therefore, virtual machines that rely on the Cluster Shared Volume may crash. Additionally, the following event is logged in the System log:

Cause


During a move of the Physical Disk resource, when the Physical Disk resource comes online on the new node, the Physical Disk resource queries the Volume Shadow Copy Service (VSS) to discover the software snapshots that are associated with that volume. If the move occurs while software snapshots are in progress, VSS may not respond or may take a long time to respond. Ultimately, this may cause the Physical Disk resource to either not come online or take a long time to come online on the new node. Therefore, virtual machines that have VHD files on the Cluster Shared Volume may crash.

Resolution


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 this specific problem.

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, submit a request to 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.

Prerequisites

To apply this hotfix, you must be running Windows Server 2012.

Registry information

To use the hotfix in this package, you do not have to make any changes to the registry.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

The hotfix that corresponds to KB 2869923 has been included with the hotfix KB 2878635, which contains all fixes that were previously included in KB 2869923. You should use the hotfix KB 2878635 to fix the issues described in KB 2869923. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
2878635 Update is available that improves the resiliency of the cloud service provider in Windows Server 2012: December 2013

Status


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

More Information


For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates