Symptoms

Consider the following scenario:

  • You connect a storage device to a computer that is running Windows Server 2008 Service Pack 2 (SP2) or Windows Server 2008 R2.

  • You configure the storage device as a multipath disk by using Microsoft Multipath I/O (MPIO) and Microsoft Device Specific Module (MSDSM).

  • Heavy I/O operations are performed on the multipath disk.

  • A path to the multipath disk fails.

In this scenario, the path failover does not work correctly. The expected behavior is that MPIO fails over to an alternative path and the I/O operations continue.

Cause

The issue occurs because MSDSM does not start a path failover correctly when the storage driver returns an error code. This issue occurs if an I/O operation fails on a removed path.

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=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 one of the following operating systems:

  • Windows Server 2008 R2 Service Pack 1 (SP1)

  • Windows Server 2008 R2

  • Windows Server 2008 SP2

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 For more information about how to obtain a Windows Server 2008 service pack, click the following article number to view the article in the Microsoft Knowledge Base:

968849 How to obtain the latest service pack for Windows Server 2008

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 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 file information notes
  • The files that apply to a specific product, SR_Level (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table.

    Version

    Product

    SR_Level

    Service branch

    6.0.600
    2.
    22xxx

    Windows Server 2008

    SP2

    LDR

  • Service Pack 1 is integrated into the release version of Windows Server 2008. Therefore, RTM milestone files apply only to Windows Vista. RTM milestone files have a 6.0.0000.xxxxxx version number.

  • 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 and for Windows Vista" section. MUM files and MANIFEST files, and the associated security catalog (.cat) files, are extremely important 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 x86-based versions of Windows Server 2008

File name

File version

File size

Date

Time

Platform

Msdsm.sys

6.0.6002.18690

91,520

07-Sep-2012

17:54

x86

Msdsm.sys

6.0.6002.22928

92,032

07-Sep-2012

17:54

x86

For all supported x64-based versions of Windows Server 2008

File name

File version

File size

Date

Time

Msdsm.sys

6.0.6002.22937

111,488

14-Sep-2012

14:59

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

File name

File version

File size

Date

Time

Platform

Msdsm.sys

6.0.6002.18690

274,816

07-Sep-2012

17:51

IA-64

Msdsm.sys

6.0.6002.22928

276,864

07-Sep-2012

17:51

IA-64

Windows Server 2008 R2 file information notes
  • The files that apply to a specific product, SR_Level (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table:

    Version

    Product

    Milestone

    Service branch

    6.1.760
    0.17xxx

    Windows Server 2008 R2

    RTM

    GDR

    6.1.760
    0.21xxx

    Windows Server 2008 R2

    RTM

    LDR

    6.1.760
    1.17xxx

    Windows Server 2008 R2

    SP1

    GDR

    6.1.760
    1.22xxx

    Windows Server 2008 R2

    SP1

    LDR

  • 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 7 and for Windows Server 2008 R2" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are extremely important 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 name

File version

File size

Date

Time

Platform

Msdsm.sys

6.1.7600.17135

140,144

04-Oct-2012

17:52

x64

Msdsm.sys

6.1.7600.21335

141,680

04-Oct-2012

18:00

x64

Msdsm.sys

6.1.7601.17965

140,656

04-Oct-2012

17:58

x64

Msdsm.sys

6.1.7601.22125

141,680

04-Oct-2012

17:53

x64

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

File name

File version

File size

Date

Time

Platform

Msdsm.sys

6.1.7600.17135

346,504

04-Oct-2012

17:27

IA-64

Msdsm.sys

6.1.7600.21335

351,600

04-Oct-2012

17:01

IA-64

Msdsm.sys

6.1.7601.17965

348,016

04-Oct-2012

16:44

IA-64

Msdsm.sys

6.1.7601.22125

351,624

04-Oct-2012

16:56

IA-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

Additional file information

Additional file information for Windows Server 2008

Additional files for all supported x86-based versions of Windows Server 2008

File name

X86_msdsm.inf_31bf3856ad364e35_6.0.6002.18690_none_cbcc7666d8fac879.manifest

File version

Not applicable

File size

1,664

Date (UTC)

07-Sep-2012

Time (UTC)

18:00

Platform

Not applicable

File name

X86_msdsm.inf_31bf3856ad364e35_6.0.6002.22928_none_cca9c8c1f1d869b2.manifest

File version

Not applicable

File size

1,664

Date (UTC)

07-Sep-2012

Time (UTC)

18:00

Platform

Not applicable

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

File name

Amd64_msdsm.inf_31bf3856ad364e35_6.0.6002.22937_none_28bc940faa3edd82.manifest

File version

Not applicable

File size

1,666

Date (UTC)

14-Sep-2012

Time (UTC)

15:03

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

File name

Ia64_msdsm.inf_31bf3856ad364e35_6.0.6002.18690_none_cbce1a5cd8f8d175.manifest

File version

Not applicable

File size

1,665

Date (UTC)

07-Sep-2012

Time (UTC)

18:00

Platform

Not applicable

File name

Ia64_msdsm.inf_31bf3856ad364e35_6.0.6002.22928_none_ccab6cb7f1d672ae.manifest

File version

Not applicable

File size

1,665

Date (UTC)

07-Sep-2012

Time (UTC)

18:00

Platform

Not applicable

Additional file information for Windows Server 2008 R2

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

File name

Amd64_msdsm.inf_31bf3856ad364e35_6.1.7600.17135_none_26722963f5142bc2.manifest

File version

Not applicable

File size

2,079

Date (UTC)

04-Oct-2012

Time (UTC)

18:45

Platform

Not applicable

File name

Amd64_msdsm.inf_31bf3856ad364e35_6.1.7600.21335_none_26fbc8150e31c8b3.manifest

File version

Not applicable

File size

2,079

Date (UTC)

04-Oct-2012

Time (UTC)

18:59

Platform

Not applicable

File name

Amd64_msdsm.inf_31bf3856ad364e35_6.1.7601.17965_none_28384069f252b566.manifest

File version

Not applicable

File size

2,079

Date (UTC)

04-Oct-2012

Time (UTC)

18:29

Platform

Not applicable

File name

Amd64_msdsm.inf_31bf3856ad364e35_6.1.7601.22125_none_28ecf5070b5018ae.manifest

File version

Not applicable

File size

2,079

Date (UTC)

04-Oct-2012

Time (UTC)

18:26

Platform

Not applicable

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

File name

Ia64_msdsm.inf_31bf3856ad364e35_6.1.7600.17135_none_ca5531d63cb4c388.manifest

File version

Not applicable

File size

2,077

Date (UTC)

04-Oct-2012

Time (UTC)

18:17

Platform

Not applicable

File name

Ia64_msdsm.inf_31bf3856ad364e35_6.1.7600.21335_none_caded08755d26079.manifest

File version

Not applicable

File size

2,077

Date (UTC)

04-Oct-2012

Time (UTC)

18:22

Platform

Not applicable

File name

Ia64_msdsm.inf_31bf3856ad364e35_6.1.7601.17965_none_cc1b48dc39f34d2c.manifest

File version

Not applicable

File size

2,077

Date (UTC)

04-Oct-2012

Time (UTC)

18:11

Platform

Not applicable

File name

Ia64_msdsm.inf_31bf3856ad364e35_6.1.7601.22125_none_cccffd7952f0b074.manifest

File version

Not applicable

File size

2,077

Date (UTC)

04-Oct-2012

Time (UTC)

18:10

Platform

Not applicable

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