Update for data deduplication to improve scalability in Windows Server 2012 R2

S’applique à : Windows Server 2012 R2 EssentialsWindows Server 2012 R2 DatacenterWindows Server 2012 R2 Foundation

This article describes issues that occur when you run data deduplication in Windows Server 2012 R2. An update is available to resolve these issue. Check out the list of issues that are fixed in this update.

Issues that are fixed in this update


  • Assume that the volume space that is used is around 1.2 terabytes (TB) and that the data deduplication job uses at least 6.5 gigabytes (GB) of memory. In this situation, the job stays at 100 percent for several minutes, and a new job cannot be started.
  • Assume that you try to run deduplication on a Cluster Shared Volumes (CSV) volume in a Windows Server 2012 R2 failover cluster. Data Protection Manager (DPM) is enabled to protect the failover cluster. When you run data deduplication, it fails.
  • Assume that multiple data deduplication jobs are queued, and the job initialization needs more than five seconds. In this situation, these jobs cannot be started together.
  • Assume that you try to run deduplication on a CSV volume in a Windows Server 2012 R2 failover cluster. DPM is enabled to protect the failover cluster. You have a large file that ran data deduplication previously. When you run data deduplication again, it runs slower than expected. 
  • Assume that you have a file server that is running Windows Server 2012 R2 and that data deduplication is running. When multiple write operations occur on the file from different resources (for example, from both local and remote shares), the file server may crash. 
  • Assume that you try run data deduplication on a CSV volume in a Windows Server 2012 R2 failover cluster. A data deduplication process (for example, paging I/O) may take more time than expected. In this situation, the CSV volume is paused and unavailable. 

Resolution


Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that 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, 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 first install the update 2919355 on Windows Server 2012 R2. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
2919355 Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 Update April, 2014

Registry information

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

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.
To resolve this issue, install update rollup 2995388. For more information about how to obtain this update rollup package, click the following article number to view the article in the Microsoft Knowledge Base:
2995388 October 2014 update rollup for Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2
 

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
For more information about date deduplication, go to the following Microsoft website: