Symptoms

Consider the following scenario:

  • You enable the Single Instance Storage (SIS) feature on one or more volumes that are hosted on a computer that is running Windows Storage Server 2008 R2.

  • You configure Distributed File System (DFS) Replication for a read-only replicated folder on one of these volumes.

In this scenario, the SIS service does not de-duplicate files that are located in the replicated folder.

Note To check whether files are de-duplicated by the SIS service, run the following command:

sisadmin /v

Cause

This issue occurs because DFS Replication read-only mini-filter driver (DfsrRo.sys) prevents the SIS service from changing the files that are located in the replicated folder. Therefore, the SIS service cannot de-duplicate these files.

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 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 Web site:

http://support.microsoft.com/contactus/?ws=supportNote 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 Storage Server 2008 R2. Additionally, the DFS Replication service under the File Server role must be installed.

Restart requirement

You may have to 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 Storage Server 2008 R2 file information notes


  • The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows Storage Server 2008 R2" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are extremely 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.

For all supported x64-based versions of Windows Storage Server 2008 R2

File name

File version

File size

Date

Time

Platform

Dfsrro.sys

6.1.7600.20787

66,944

24-Aug-2010

00:57

x64

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 how to enable or disable the SIS feature on a volume, visit the following Microsoft website:

General information about how to enable or disable the SIS feature on a volumeFor more information about how to manage the SIS feature by using the SisAdmin.exe command, visit the following Microsoft website:

General information about how to manage the SIS feature by using the "SisAdmin.exe" command For more information about how to download SIS in Microsoft Windows Storage Server 2003 R2, visit the following Microsoft website:

Download information for SIS in Microsoft Windows Storage Server 2003 R2For more information about the functions of the SIS filter and the Groveler service, click the following article number to view the article in the Microsoft Knowledge Base:

299726 A Description of the Functions of the Single Instance Storage Filter and the Groveler ServiceFor 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

Additional file information

Additional file information for Windows Storage Server 2008 R2

Additional files for all supported x64-based versions of Windows Storage Server 2008 R2

File name

Amd64_4be2e7596fdf5141ed0b7f77e72af4c6_31bf3856ad364e35_6.1.7600.20787_none_af6daf0bc295acb7.manifest

File version

Not applicable

File size

705

Date (UTC)

25-Aug-2010

Time (UTC)

17:43

Platform

Not applicable

File name

Amd64_microsoft-windows-dfsr-readonly_31bf3856ad364e35_6.1.7600.20787_none_ac069f727690e042.manifest

File version

Not applicable

File size

3,403

Date (UTC)

24-Aug-2010

Time (UTC)

01:47

Platform

Not applicable

File name

Update.mum

File version

Not applicable

File size

2,316

Date (UTC)

25-Aug-2010

Time (UTC)

17:43

Platform

Not applicable

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