The LUN for a storage device is lost when multiple paths are lost concurrently in Windows

Applies to: Windows Server 2012 R2 DatacenterWindows Server 2012 R2 EssentialsWindows Server 2012 R2 Foundation

Symptoms


Assume that you configure a Windows Server 2012 R2, Windows Server 2012 or Windows Server 2008 R2-based computer to use Microsoft Multipath I/O (MPIO) and Microsoft Device Specific Module (DSM). You connect a storage device to the computer by using redundant physical paths. In this scenario, when multiple paths are lost concurrently, the logical unit number (LUN) for the storage device is lost on the computer.

Cause


This problem occurs because, while the system tries to fail over one of the paths to the other path, the other path has also failed.

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 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 one of the following operating systems:
  • Windows Server 2012 R2
  • Windows Server 2012
  • Windows Server 2008 R2

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any previously released hotfix.

Status


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

References


See the terminology Microsoft uses to describe software updates.

Additional file information



Additional file information for Windows Server 2012 R2

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Time (UTC)16:33
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Time (UTC)23:29
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Additional file information for Windows Server 2012

Additional files for all supported x64-based versions of Windows Server 2012
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Time (UTC)09:52
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Additional file information for Windows Server 2008 R2

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Additional files for all supported IA-64-based versions of Windows Server 2008 R2
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