Symptoms

Consider the following scenario:

  • You connect a Windows Server 2008-based computer to a storage device that is controlled by Microsoft Multipath I/O (MPIO).

  • A failover occurs on the MPIO paths.

In this scenario, the failover process does not complete. Additionally, all MPIO-related operations stop responding.

Cause

This problem occurs because the MPIO.sys driver does not decrement an I/O count correctly.

Resolution

Hotfix information

Important Windows Vista and Windows Server 2008 hotfixes are included in the same packages. However, only one of these products may be listed on the “Hotfix Request” page. To request the hotfix package that applies to both Windows Vista and Windows Server 2008, just select the product that is listed on the page.

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 Web site:

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

No prerequisites are required.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other hotfixes.

File information

The Global version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.

Windows Vista and 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 fileversion numbers as shown in the following table.

    Version

    Product

    SR_Level

    Service branch

    6.0.6000.16xxx

    Windows Vista

    RTM

    GDR

    6.0.6000.20xxx

    Windows Vista

    RTM

    LDR

    6.0.6001.18xxx

    Windows Vista and Windows Server 2008

    SP1

    GDR

    6.0.6001.22xxx

    Windows Vista and Windows Server 2008

    SP1

    LDR

    6.0.6002.18xxx

    Windows Vista and Windows Server 2008

    SP2

    GDR

    6.0.6002.22xxx

    Windows Vista and Windows Server 2008

    SP2

    LDR

  • Service Pack 1 is integrated into Windows Server 2008.

  • The MANIFEST files (.manifest) and MUM files (.mum)installed for each environment are listed separately. MUM and MANIFEST files, andthe associated security catalog (.cat) files, are critical to maintaining thestate of the updated component. The security catalog files (attributes notlisted) 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

Mpio.inf

Not Applicable

3,760

29-Apr-2009

09:00

Not Applicable

Mpio.sys

6.0.6001.22422

107,488

29-Apr-2009

14:08

x86

Mpio.inf

Not Applicable

3,760

29-Apr-2009

08:57

Not Applicable

Mpio.sys

6.0.6002.22125

107,496

29-Apr-2009

19:25

x86

For all supported x64-based versions of Windows Server 2008

File name

File version

File size

Date

Time

Platform

Mpio.inf

Not Applicable

3,768

29-Apr-2009

09:01

Not Applicable

Mpio.sys

6.0.6001.22422

131,040

29-Apr-2009

14:20

x64

Mpio.inf

Not Applicable

3,768

29-Apr-2009

08:57

Not Applicable

Mpio.sys

6.0.6002.22125

131,560

29-Apr-2009

19:18

x64

For all supported Itanium-based versions of Windows Server 2008

File name

File version

File size

Date

Time

Platform

Mpio.inf

Not Applicable

3,764

29-Apr-2009

08:58

Not Applicable

Mpio.sys

6.0.6001.22422

290,272

29-Apr-2009

14:06

IA-64

Mpio.inf

Not Applicable

3,764

29-Apr-2009

08:57

Not Applicable

Mpio.sys

6.0.6002.22125

291,288

29-Apr-2009

19:22

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 for Windows Server 2008

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

File name

File version

File size

Date

Time

Platform

Package_for_kb968287_sc_0~31bf3856ad364e35~x86~~6.0.1.0.mum

Not Applicable

1,421

30-Apr-2009

07:28

Not Applicable

Package_for_kb968287_sc_1~31bf3856ad364e35~x86~~6.0.1.0.mum

Not Applicable

1,690

30-Apr-2009

07:28

Not Applicable

Package_for_kb968287_sc~31bf3856ad364e35~x86~~6.0.1.0.mum

Not Applicable

1,701

30-Apr-2009

07:28

Not Applicable

Package_for_kb968287_server_0~31bf3856ad364e35~x86~~6.0.1.0.mum

Not Applicable

1,425

30-Apr-2009

07:28

Not Applicable

Package_for_kb968287_server_1~31bf3856ad364e35~x86~~6.0.1.0.mum

Not Applicable

1,694

30-Apr-2009

07:28

Not Applicable

Package_for_kb968287_server~31bf3856ad364e35~x86~~6.0.1.0.mum

Not Applicable

1,713

30-Apr-2009

07:28

Not Applicable

X86_mpio.inf_31bf3856ad364e35_6.0.6001.22422_none_1da8dfd4a880413d.manifest

Not Applicable

1,659

30-Apr-2009

07:33

Not Applicable

X86_mpio.inf_31bf3856ad364e35_6.0.6002.22125_none_1f92529aa5a3e266.manifest

Not Applicable

1,659

30-Apr-2009

07:33

Not Applicable

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

File name

File version

File size

Date

Time

Platform

Amd64_mpio.inf_31bf3856ad364e35_6.0.6001.22422_none_79c77b5860ddb273.manifest

Not Applicable

1,661

30-Apr-2009

07:37

Not Applicable

Amd64_mpio.inf_31bf3856ad364e35_6.0.6002.22125_none_7bb0ee1e5e01539c.manifest

Not Applicable

1,661

30-Apr-2009

07:37

Not Applicable

Package_for_kb968287_sc_0~31bf3856ad364e35~amd64~~6.0.1.0.mum

Not Applicable

1,429

30-Apr-2009

07:28

Not Applicable

Package_for_kb968287_sc_1~31bf3856ad364e35~amd64~~6.0.1.0.mum

Not Applicable

1,702

30-Apr-2009

07:28

Not Applicable

Package_for_kb968287_sc~31bf3856ad364e35~amd64~~6.0.1.0.mum

Not Applicable

1,711

30-Apr-2009

07:28

Not Applicable

Package_for_kb968287_server_0~31bf3856ad364e35~amd64~~6.0.1.0.mum

Not Applicable

1,433

30-Apr-2009

07:28

Not Applicable

Package_for_kb968287_server_1~31bf3856ad364e35~amd64~~6.0.1.0.mum

Not Applicable

1,706

30-Apr-2009

07:28

Not Applicable

Package_for_kb968287_server~31bf3856ad364e35~amd64~~6.0.1.0.mum

Not Applicable

1,723

30-Apr-2009

07:28

Not Applicable

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

File name

File version

File size

Date

Time

Platform

Ia64_mpio.inf_31bf3856ad364e35_6.0.6001.22422_none_1daa83caa87e4a39.manifest

Not Applicable

1,660

30-Apr-2009

07:28

Not Applicable

Ia64_mpio.inf_31bf3856ad364e35_6.0.6002.22125_none_1f93f690a5a1eb62.manifest

Not Applicable

1,660

30-Apr-2009

07:28

Not Applicable

Package_for_kb968287_sc_0~31bf3856ad364e35~ia64~~6.0.1.0.mum

Not Applicable

1,425

30-Apr-2009

07:28

Not Applicable

Package_for_kb968287_sc_1~31bf3856ad364e35~ia64~~6.0.1.0.mum

Not Applicable

1,529

30-Apr-2009

07:28

Not Applicable

Package_for_kb968287_sc~31bf3856ad364e35~ia64~~6.0.1.0.mum

Not Applicable

1,706

30-Apr-2009

07:28

Not Applicable

Package_for_kb968287_server_0~31bf3856ad364e35~ia64~~6.0.1.0.mum

Not Applicable

1,429

30-Apr-2009

07:28

Not Applicable

Package_for_kb968287_server_1~31bf3856ad364e35~ia64~~6.0.1.0.mum

Not Applicable

1,533

30-Apr-2009

07:28

Not Applicable

Package_for_kb968287_server~31bf3856ad364e35~ia64~~6.0.1.0.mum

Not Applicable

1,717

30-Apr-2009

07:28

Not Applicable

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