MPIO disk is removed unexpectedly when a PR_IN command fails in a Windows Server 2008 R2 environment

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Article ID: 2718576 - View products that this article applies to.
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Symptoms

Consider the following scenario:
  • You configure the Failover Clustering feature in a Windows Server 2008 R2 environment.
  • You configure the disk resource for the Failover Clustering feature to use Multipath I/O (MPIO).
  • A transient error occurs, and all paths to the disk resource are unavailable.
  • A Persistent Reservation IN (PR_IN) command fails on all paths.
In this scenario, a failover starts. Then, the failover moves the disk resource for the Failover Clustering feature to another node. Additionally, the state of the disk resource on the cluster-available disk and the state of cluster-shared volumes are changed to "redirected access."

Note After this issue occurs, you experience the following issues:
  • The Iscsicli session list command returns -1 as the Device Number that is listed under Devices in the cmd window.
  • The MPIO tab on the iSCSi initiator GUI is unavailable.
  • Event ID 5121 is logged in the event log.

Note The Failover Cluster feature uses Persistent Reservation commands to reserve a disk resource for an active node. A server requests a reservation and then sends the reservation to the storage device for the storage object. After the storage device grants the reservation, the server registers a key. Requests from other servers to access the same storage object are denied if the requests do not include the key. The host bus adapter (HBA) that stores the key can access the storage device. The Failover Cluster feature uses a Persistent Reserve IN (PR_IN) command to read keys from the PR table on the storage device.

Cause

This issue occurs because the PR_IN command is retried on an alternative path when the PR_IN command fails on a disk resource that has MPIO configured. If the PR_IN command fails on all available paths, the state of the MPIO disk is changed to "pending failure." Additionally, the MPIO disk is removed before the time expires in the PDORemovePeriod parameter that is configured in the following registry key:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\mpio\Parameters

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 or 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:
976932 Information about Service Pack 1 for Windows 7 and for Windows Server 2008 R2

Registry information

After the update is installed, you must create a registry key. To do this, follow these steps.

Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
322756 How to back up and restore the registry in Windows
  1. Start Registry Editor. To do this, click Start, type regedit in the Start Search box, and then press Enter.
  2. Locate and then click the following registry key: 
    HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\mpio\Parameters
  3. On the Edit menu, point to New, and then click DWORD (32 bit) Value
  4. Type DiskPathCheckEnabled, and then press Enter.
  5. On the Edit menu, click Modify.
  6. In the Value data box, type 1, and then click OK.
  7. Exit Registry Editor.
Notes
  • If the DiskPathCheckEnabled key is set to a nonzero value, the MPIO component creates a path recovery worker. This occurs when a PR_IN command fails on all available paths to an MPIO disk.
  • To configure the time interval at which the MPIO component starts path recovery attempts, modify the registry key. To do this, follow these steps:
    1. Start Registry Editor. To do this, click Start, type regedit in the Start Search box, and then press Enter.
    2. Locate and then click the following registry key: 
      HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\mpio\Parameters
    3. On the Edit menu, point to New, and then click DWORD (32 bit) Value
    4. Type DiskPathCheckInterval, and then press Enter.
    5. On the Edit menu, click Modify.
    6. In the Value data box, type a value to represent a particular number of seconds, and then click OK.
    7. Exit Registry Editor.
  • If the DiskPathCheckInterval key is set to 0, or if the key does not exist, the MPIO component uses a default time interval. The default time interval is half of the time that is set in the PDORemovePeriod parameter.

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 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, milestone (RTM,SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table:
    Collapse this tableExpand this table
    VersionProductMilestoneService branch
    6.1.760 0.17xxxWindows Server 2008 R2RTMGDR
    6.1.760 0.21xxxWindows Server 2008 R2RTMLDR
    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) that are installed for each environment are listed separately in the "Additional file information for Windows Server 2008 R2" section. 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 Server 2008 R2
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Mpio.inf_locNot applicable1,25808-Jun-201205:16Not applicable
Mpio.sys6.1.7600.17037158,06408-Jun-201205:29x64
Mpio.sys6.1.7600.21229159,60008-Jun-201205:40x64
Mpio.sys6.1.7601.17858158,57608-Jun-201205:39x64
Mpio.sys6.1.7601.22014159,60008-Jun-201205:36x64
For all supported IA-64-based versions of Windows Server 2008 R2
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Mpio.inf_locNot applicable1,25808-Jun-201204:13Not applicable
Mpio.sys6.1.7600.17037355,18408-Jun-201204:18IA-64
Mpio.sys6.1.7600.21229362,86408-Jun-201204:15IA-64
Mpio.sys6.1.7601.17858355,18408-Jun-201204:15IA-64
Mpio.sys6.1.7601.22014363,37608-Jun-201204:24IA-64

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 the PDORemovePeriod structure, go to the following Microsoft website:
General information about the PDORemovePeriod structure

Additional file information

Additional file information for Windows Server 2008 R2

Additional files for all supported x64-based versions of Windows Server 2008 R2
Collapse this tableExpand this table
File nameAmd64_02ff06d9693f9e0a2e49825d9aec4d12_31bf3856ad364e35_6.1.7601.22014_none_16605290dd82c159.manifest
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File size650
Date (UTC)08-Jun-2012
Time (UTC)23:41
PlatformNot applicable
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File size650
Date (UTC)08-Jun-2012
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File size650
Date (UTC)08-Jun-2012
Time (UTC)23:41
PlatformNot applicable
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File nameAmd64_afe133c393f0d0514260f1ad7962734b_31bf3856ad364e35_6.1.7601.22014_none_528917d8ebba22fa.manifest
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File nameAmd64_mpio.inf_31bf3856ad364e35_6.1.7601.22014_none_7be25ca9bf119430.manifest
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Additional files for all supported IA-64-based versions of Windows Server 2008 R2
Collapse this tableExpand this table
File nameIa64_086b69711092de2f2146793f6886599c_31bf3856ad364e35_6.1.7601.22014_none_10248da0072e0a53.manifest
File versionNot applicable
File size648
Date (UTC)08-Jun-2012
Time (UTC)23:41
PlatformNot applicable
File nameIa64_1a2e58a6e0b0bd8acfd89bd5d657bb74_31bf3856ad364e35_6.1.7601.22014_none_09788647abb886b6.manifest
File versionNot applicable
File size648
Date (UTC)08-Jun-2012
Time (UTC)23:41
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File nameIa64_252d291d678ea80ef9c3db241d479b7c_31bf3856ad364e35_6.1.7601.22014_none_ffbe7b00fa86eca2.manifest
File versionNot applicable
File size648
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File nameIa64_mpio.inf_31bf3856ad364e35_6.1.7601.22014_none_1fc5651c06b22bf6.manifest
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File size2,071
Date (UTC)08-Jun-2012
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Properties

Article ID: 2718576 - Last Review: September 7, 2012 - Revision: 2.0
Applies to
  • Windows Server 2008 R2 Datacenter
  • Windows Server 2008 R2 Enterprise
  • Windows Server 2008 R2 for Itanium-Based Systems
Keywords: 
kbautohotfix kbqfe kbhotfixserver kbfix kbexpertiseadvanced kbsurveynew KB2718576

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