Cluster service fails when shutting down or data deduplication fails with "Drive is locked" in Windows Server 2012 R2

Applies to: Windows Server 2012 R2 DatacenterWindows Server 2012 R2 StandardWindows Server 2012 R2 Essentials More

This article describes two issues that are addressed in this update: the cluster service fails when it's being shut down and data deduplication fails with the "This drive is locked by BitLocker Drive Encryption. You must unlock this drive from Control Panel" error message in Windows Server 2012 R2. Before you install this update, see the Prerequisites section.

Issus that are fixed in this update

Issue 1

Critical error occurs when you shut down the cluster service. For example, the "[Shutdown] Groups failed to terminate in a timely manner. Cluster service will exit." error message is logged when you shut down the cluster service.

Issue 2

Data deduplication doesn't work on a BitLocker-encrypted cluster shared volume (CSV) provisioned by using a tiered storage space. It fails even if the drive is unlocked, and the following error message is logged:

This drive is locked by BitLocker Drive Encryption. You must unlock this drive from Control Panel

How to get this update

Important If you install a language pack after you install this update, you must reinstall this update. Therefore, we recommend that you install any language packs that you need before you install this update. For more information, see Add language packs to Windows.

Method 1: Windows Update

This update is provided as an Optional update on Windows Update. For more information on how to run Windows Update, see How to get an update through Windows Update.

Method 2: Microsoft Update Catalog

To get the stand-alone package for this update, go to the Microsoft Update Catalog website.

Update detail information


To install this update, install April 2014, update rollup for Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 (2919355) in Windows Server 2012 R2.

Registry information

To apply this update, you don't have to make any changes to the registry.

Restart requirement

You may have to restart the computer after you apply this update.

Update replacement information

This update doesn't replace a previously released update.


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


Learn about the terminology that Microsoft uses to describe software updates.

File Information

The English (United States) version of this software update installs files that have the attributes that are listed in the following tables.