MPIO does not log path failure events in the event log on a Windows Server 2008 R2-based computer

Applies to: Windows Server 2008 R2Windows 7Windows Server 2008 R2 Service Pack 1

Symptoms


 

You encounter one of the following issues when you connect a storage device that is controlled by the Microsoft Multipath I/O (MPIO) feature to a Windows Server 2008 R2-based computer.

Issue 1
Assume that you set the MPIO feature to fail over mode. Then, an application performs I/O operations on one of the standby paths. When a different standby path fails and then is restored, the MPIO feature does not log any events in the event log.

Issue 2
Assume that you set the MPIO feature to round-robin mode. When a standby path fails and then is restored, the MPIO feature only logs an event for the restore operation in the event log.

Note When a standby path fails, two events are logged in the event log. One event is logged when the failure occurs and the other event is logged when the standby path is restored.

Cause



This issue occurs because the MPIO feature does not log an event when a standby path fails because of a Plug and Play (PnP) event.

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:
http://support.microsoft.com/contactus/?ws=support
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 Service Pack 1 (SP1). For more information about how to obtain a 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 hsotfix.

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 2008 R2 file information notes
Important To request the hotfix package that applies to Windows Server 2008 R2, 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, 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
    6.1.760 1.21xxxWindows 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 for Windows Server 2008 R2" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are critical 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
Mpio.sys6.1.7601.21953158,06429-Mar-201219:32x64

For all supported IA-64-based versions of Windows Server 2008 R2

File nameFile versionFile sizeDateTimePlatform
Mpio.sys6.1.7601.21953358,25629-Mar-20124:24IA-64

 

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 for Windows Server 2008 R2

Additional files for all supported x64-based versions of Windows Server 2008 R2
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Date (UTC)30-Mar-2012
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Additional files for all supported IA-64-based versions of Windows Server 2008 R2
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