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Large backlogs on Windows -based DFSR servers

Symptoms
Assume that you have Windows Server 2008 R2 Service Pack 1 (SP1)-based servers, Windows Server 2012 R2-based servers, or Windows Server 2012-based servers that use the Distributed File System Replication (DFSR) service. You have a DFSR replication topology in your environment. In this situation, you experience a spike of backlogs on a daily or weekly basis. Additionally, in the DFSR debug log, you notice that the "GcTask::refreshrecord" entry refreshes lots of records regularly.
Cause
This issue occurs when the garbage collection task (GCTask) of DFSR refreshes the stale records. When a garbage collection task processes the version vector tombstone of a content set before the non-version vector tombstone, the task considers all the records that belong to the content set to be stale. Therefore, the records are refreshed, and the issue that is described in the "Symptoms" section occurs.

Resolution
To resolve this issue, we have released a hotfix for Windows Server 2012 or Windows Server 2008 R2, and we have released an update rollup for Windows 8.1 or Windows Server 2012 R2.

Get the update rollup for Windows Server 2012 R2

To resolve this issue, install the November 2014 update rollup for Windows RT 8.1, Windows 8.1, or Windows Server 2012 R2.

Get the hotfix for Windows Server 2012 or Windows Server 2008 R2

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, visit 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 2008 R2 SP1.

For more information about how to obtain a Windows 7 or Windows Server 2008 R2 service pack, click the following article number to view the article in the Microsoft Knowledge Base:
976932Information about Service Pack 1 for Windows 7 and for Windows Server 2008 R2

Registry information

To apply this hotfix, 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

This hotfix does not replace a previously released hotfix.

File information

The global version of this hotfix installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.
Windows Server 2012 file information notes
Important Windows 8 hotfixes and Windows Server 2012 hotfixes are included in the same packages. However, hotfixes on the Hotfix Request page are listed under both operating systems. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows 8/Windows Server 2012" on the page. Always refer to the "Applies To" section in articles to determine the actual operating system that each hotfix applies to.
  • The files that apply to a specific product, SR_Level (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table:
    VersionProductMilestoneService branch
    6.2.920  0.16xxxWindows Server 2012RTMGDR
    6.2.920  0.21xxxWindows Server 2012RTMLDR
  • GDR service branches contain only those fixes that are widely released to address widespread, critical issues. 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 separately in the "Additional file information" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are extremely important to maintaining the state of the updated component. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.
For all supported x64-based versions of Windows Server 2012
File nameFile versionFile sizeDateTimePlatform
Dfsrprovs.mofNot applicable75,76125-Jul-201220:12Not applicable
Dfsrress.dll6.2.9200.163842,04826-Jul-201202:33x64
Dfsrs.exe6.2.9200.213944,724,73614-Feb-201505:55x64
Windows Server 2008 R2 file information notes
Important Windows 7 hotfixes and Windows Server 2008 R2 hotfixes are included in the same packages. However, hotfixes on the Hotfix Request page are listed under both operating systems. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows 7/Windows Server 2008 R2" on the page. Always refer to the "Applies To" section in articles to determine the actual operating system that each hotfix applies to.
  • The files that apply to a specific product, SR_Level (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table:
    VersionProductMilestoneService branch
    6.1.760 1.17xxxWindows Server 2008 R2SP1GDR
    6.1.760 1.22xxxWindows Server 2008 R2SP1LDR
  • GDR service branches contain only those fixes that are widely released to address widespread, critical issues. 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 separately in the "Additional file information" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are extremely important to maintaining the state of the updated component. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.
For all supported x64-based versions of Windows Server 2008 R2
File nameFile versionFile sizeDateTimePlatform
Dfsrprovs.mflNot applicable109,56614-Jul-200901:49Not applicable
Dfsrprovs.mflNot applicable109,56614-Jul-200901:45Not applicable
Dfsrprovs.mflNot applicable109,56614-Jul-200902:01Not applicable
Dfsrprovs.mflNot applicable109,56614-Jul-200901:58Not applicable
Dfsrprovs.mflNot applicable120,04014-Jul-200902:02Not applicable
Dfsrprovs.mflNot applicable109,56614-Jul-200901:50Not applicable
Dfsrprovs.mflNot applicable109,56614-Jul-200901:24Not applicable
Dfsrprovs.mflNot applicable119,74414-Jul-200901:54Not applicable
Dfsrprovs.mflNot applicable109,56614-Jul-200901:57Not applicable
Dfsrprovs.mflNot applicable109,56614-Jul-200901:50Not applicable
Dfsrprovs.mflNot applicable121,70414-Jul-200902:02Not applicable
Dfsrprovs.mflNot applicable109,56614-Jul-200901:57Not applicable
Dfsrprovs.mflNot applicable109,56614-Jul-200901:47Not applicable
Dfsrprovs.mflNot applicable109,56614-Jul-200902:01Not applicable
Dfsrprovs.mflNot applicable120,83414-Jul-200902:01Not applicable
Dfsrprovs.mflNot applicable82,09614-Jul-200902:10Not applicable
Dfsrprovs.mflNot applicable109,56614-Jul-200903:10Not applicable
Dfsrprovs.mflNot applicable109,56614-Jul-200901:55Not applicable
Dfsrprovs.mflNot applicable109,56614-Jul-200901:51Not applicable
Dfsrprovs.mflNot applicable109,56614-Jul-200901:50Not applicable
Dfsrprovs.mflNot applicable117,78214-Jul-200901:52Not applicable
Dfsrprovs.mflNot applicable109,56614-Jul-200901:45Not applicable
Dfsrprovs.mflNot applicable109,56614-Jul-200901:53Not applicable
Dfsrprovs.mflNot applicable109,56614-Jul-200901:54Not applicable
Dfsrprovs.mflNot applicable109,56614-Jul-200901:47Not applicable
Dfsrprovs.mflNot applicable109,56614-Jul-200902:02Not applicable
Dfsrprovs.mflNot applicable109,56614-Jul-200901:52Not applicable
Dfsrprovs.mflNot applicable109,56614-Jul-200901:57Not applicable
Dfsrprovs.mflNot applicable109,56614-Jul-200901:56Not applicable
Dfsrprovs.mflNot applicable109,56614-Jul-200901:54Not applicable
Dfsrprovs.mflNot applicable109,56614-Jul-200901:47Not applicable
Dfsrprovs.mflNot applicable109,56614-Jul-200901:45Not applicable
Dfsrprovs.mflNot applicable109,56614-Jul-200901:47Not applicable
Dfsrprovs.mflNot applicable109,56614-Jul-200903:04Not applicable
Dfsrprovs.mflNot applicable109,56614-Jul-200901:51Not applicable
Dfsrprovs.mflNot applicable109,56614-Jul-200903:04Not applicable
Dfsrprovs.mofNot applicable75,76124-Sep-201422:39Not applicable
Dfsrress.dll6.1.7601.175142,04820-Nov-201012:57x64
Dfsrs.exe6.1.7601.228194,536,32025-Sep-201402:07x64
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:
824684Description of the standard terminology that is used to describe Microsoft software updates

Additional file information

Additional file information for Windows Server 2012

Additional files for all supported x64-based versions of Windows Server 2012
File propertyValue
File nameAmd64_a2e13e77cc516f3acb54509df188e3ad_31bf3856ad364e35_6.2.9200.21394_none_937a8e03796c1014.manifest
File versionNot applicable
File size712
Date (UTC)14-Feb-2015
Time (UTC)14:45
PlatformNot applicable
File nameAmd64_microsoft-windows-dfsr-core-serveronly_31bf3856ad364e35_6.2.9200.21394_none_f6d40c8c4ab15ca1.manifest
File versionNot applicable
File size37,695
Date (UTC)14-Feb-2015
Time (UTC)14:45
PlatformNot applicable
Additional files for all supported x64-based versions of Windows Server 2008 R2
File propertyValue
File nameAmd64_01db9ad6c14906203bf13a64ef838a12_31bf3856ad364e35_6.1.7601.22819_none_becef21a6a8d0c54.manifest
File versionNot applicable
File size720
Date (UTC)25-Sep-2014
Time (UTC)06:14
File nameAmd64_02141d5c3a0cfec77f9ae499c6ad1ac4_31bf3856ad364e35_6.1.7601.22819_none_5b785ac2b6672c21.manifest
File versionNot applicable
File size720
Date (UTC)25-Sep-2014
Time (UTC)06:14
File nameAmd64_03e08ac945fe4f055c620f05621637c2_31bf3856ad364e35_6.1.7601.22819_none_1bf0df94bbafe2e3.manifest
File versionNot applicable
File size720
Date (UTC)25-Sep-2014
Time (UTC)06:14
File nameAmd64_05ddccee1a5a51d4fd7ec0f6f452a371_31bf3856ad364e35_6.1.7601.22819_none_490fd84e51cf4c05.manifest
File versionNot applicable
File size720
Date (UTC)25-Sep-2014
Time (UTC)06:14
File nameAmd64_110d2cd44d9846868419d12b55b11345_31bf3856ad364e35_6.1.7601.22819_none_d8dc99b32326a4fb.manifest
File versionNot applicable
File size720
Date (UTC)25-Sep-2014
Time (UTC)06:14
File nameAmd64_2321e46dab0f00122b3a0763b31f3e91_31bf3856ad364e35_6.1.7601.22819_none_e009d62595eb6761.manifest
File versionNot applicable
File size720
Date (UTC)25-Sep-2014
Time (UTC)06:14
File nameAmd64_29fd590792153c08c20fbd05ae5c39fb_31bf3856ad364e35_6.1.7601.22819_none_94489253ff6f5eab.manifest
File versionNot applicable
File size720
Date (UTC)25-Sep-2014
Time (UTC)06:14
File nameAmd64_2cc6838667581eef164144bfa8e93292_31bf3856ad364e35_6.1.7601.22819_none_e6067d372ea86655.manifest
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File size720
Date (UTC)25-Sep-2014
Time (UTC)06:14
File nameAmd64_2df008ec3faa3f17557a7278feb5c5b7_31bf3856ad364e35_6.1.7601.22819_none_a2b09159f5c2a11f.manifest
File versionNot applicable
File size720
Date (UTC)25-Sep-2014
Time (UTC)06:14
File nameAmd64_35ad52ef999caa7d78884feaa01f2856_31bf3856ad364e35_6.1.7601.22819_none_2df0d009e67aaf2c.manifest
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File size720
Date (UTC)25-Sep-2014
Time (UTC)06:14
File nameAmd64_5a8627635fc4abd0f1348d6fd1a81488_31bf3856ad364e35_6.1.7601.22819_none_abae2b90b743b8b2.manifest
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File size720
Date (UTC)25-Sep-2014
Time (UTC)06:14
File nameAmd64_5f60d398be010535197717075f8da80f_31bf3856ad364e35_6.1.7601.22819_none_8be533bb5c5b36e3.manifest
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File size720
Date (UTC)25-Sep-2014
Time (UTC)06:14
File nameAmd64_68f3662eda5b15fe46e11b52d4c0d205_31bf3856ad364e35_6.1.7601.22819_none_b7e415f85a69221b.manifest
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File size720
Date (UTC)25-Sep-2014
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File nameAmd64_7d9782c0e4be35d2bf179e1bef85cb85_31bf3856ad364e35_6.1.7601.22819_none_a61f178a2f1e61d3.manifest
File versionNot applicable
File size720
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File nameAmd64_81d4222b0d4ca63fef6da278f3e24f2f_31bf3856ad364e35_6.1.7601.22819_none_6dc6c8aa77bd9593.manifest
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File size35,681
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Properties

Article ID: 2884176 - Last Review: 04/14/2015 22:46:00 - Revision: 3.0

  • Windows Server 2012 R2 Datacenter
  • Windows Server 2012 R2 Essentials
  • Windows Server 2012 R2 Foundation
  • Windows Server 2012 R2 Standard
  • Windows Server 2012 Datacenter
  • Windows Server 2012 Standard
  • Windows Server 2012 Essentials
  • Windows Server 2012 Foundation
  • Windows Server 2008 R2 Service Pack 1
  • kbautohotfix kbqfe kbhotfixserver kbfix kbsurveynew kbexpertiseadvanced KB2884176
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