Data scrubbing jobs freeze and fail in Windows Server 2012 R2

This article describes a problem that occurs if you enable data deduplication and then run a data scrubbing job on a deduplicated volume in Windows Server 2012 R2. An update is available to fix this issue. Before you install this update, see the Prerequisites section.
Assume that you have a computer that's running Windows Server 2012 R2, and you have enabled data deduplication in one or more volumes on your system. When you run a data scrubbing job on a deduplicated volume, the job may freeze or fail. 
This problem occurs because redundant actions were performed during data scrubbing.
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 a Recommended 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 Download Center

The following files are available for download from the Microsoft Download Center.
Operating systemUpdate
All supported x64-based versions of Windows Server 2012 R2DownloadDownload the package now.
For more information about how to download Microsoft support files, select the following article number to view the article in the Microsoft Knowledge Base:
119591 How to obtain Microsoft support files from online services
Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.
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.

Windows Server 2012 R2

  • The files that apply to a specific product, milestone (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table.

    VersionProductMilestoneService branch
    6.3.960 0.18xxxWindows Server 2012 R2RTMGDR
  • GDR service branches contain only those fixes that are widely released to address widespread, critical problem. LDR service branches contain hotfixes in addition to widely released fixes.
  • The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed in the "Additional file information" section. MUM, MANIFEST, and the associated security catalog (.cat) files, are very important to maintain the state of the updated components. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.
x64 Windows Server 2012 R2
File nameFile versionFile sizeDateTimePlatform

Additional file information

x64 Windows Server 2012 R2
File propertyValue
File nameAmd64_5bc9c174ef58968373dc6dd9be6eb2bb_31bf3856ad364e35_6.3.9600.18185_none_5be66b568bd2babc.manifest
File versionNot applicable
File size706
Date (UTC)31-Dec-2015
Time (UTC)04:43
PlatformNot applicable
File nameAmd64_microsoft-windows-dedup-pipeline_31bf3856ad364e35_6.3.9600.18185_none_4a1afd0994c0c4de.manifest
File versionNot applicable
File size14,040
Date (UTC)30-Dec-2015
Time (UTC)15:36
PlatformNot applicable
File nameUpdate.mum
File versionNot applicable
File size1,575
Date (UTC)31-Dec-2015
Time (UTC)04:43
PlatformNot applicable

Article ID: 3127060 - Last Review: 03/08/2016 18:52:00 - Revision: 3.0

Windows Server 2012 R2 Datacenter, Windows Server 2012 R2 Standard, Windows Server 2012 R2 Essentials, Windows Server 2012 R2 Foundation

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