You cannot use an MPIO storage device after a failover operation in Windows Server 2008 or in Windows Server 2008 R2

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Symptoms

Consider the following scenario:

  • You connect a computer that is running Windows Server 2008 or Windows Server 2008 R2 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 operation is unsuccessful. Therefore, you cannot use the storage device.

Cause

This issue occurs because the pseudo-LUN is removed when the last path is removed and while MPIO is waiting for an alternative path to become available. This behavior causes lost I/O or failed I/O. Or, some "delay write" errors occur at the file system level.

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 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

To apply this hotfix, you must be running one of the following operating systems:

  • Windows Server 2008

  • Windows Server 2008 Service Pack 2 (SP2)

  • 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

Restart requirement

You may have to restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

File information

The English (United States) 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
    1.
    22xxx

    Windows Server 2008

    SP1

    LDR

    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.xxxxx 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" section. MUM files and MANIFEST files, and the associated security catalog (.cat) files, are very 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 x86-based versions of Windows Server 2008

File name

File version

File size

Date

Time

Platform

Mpio.sys

6.0.6001.22649

105,872

05-Mar-2010

17:16

x86

Mpio.sys

6.0.6002.22355

106,376

05-Mar-2010

16:41

x86

For all supported x64-based versions of Windows Server 2008

File name

File version

File size

Date

Time

Platform

Mpio.sys

6.0.6001.22649

129,928

05-Mar-2010

18:10

x64

Mpio.sys

6.0.6002.22355

130,432

05-Mar-2010

16:31

x64

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

File name

File version

File size

Date

Time

Platform

Mpio.sys

6.0.6001.22649

289,160

05-Mar-2010

16:55

IA-64

Mpio.sys

6.0.6002.22355

290,176

05-Mar-2010

16:19

IA-64

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 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 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

File name

File version

File size

Date

Time

Platform

Mpio.sys

6.1.7600.20853

155,008

09-Dec-2010

06:27

x64

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

File name

File version

File size

Date

Time

Platform

Mpio.sys

6.1.7600.20853

348,544

09-Dec-2010

05:23

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

Update.mum

File version

Not Applicable

File size

3,068

Date (UTC)

06-Mar-2010

Time (UTC)

03:38

Platform

Not Applicable

File name

X86_mpio.inf_31bf3856ad364e35_6.0.6001.22649_none_1d9a45cea88a24ce.manifest

File version

Not Applicable

File size

1,659

Date (UTC)

06-Mar-2010

Time (UTC)

03:39

Platform

Not Applicable

File name

X86_mpio.inf_31bf3856ad364e35_6.0.6002.22355_none_1f71e6a2a5bc3087.manifest

File version

Not Applicable

File size

1,659

Date (UTC)

06-Mar-2010

Time (UTC)

03:39

Platform

Not Applicable

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

File name

Amd64_mpio.inf_31bf3856ad364e35_6.0.6001.22649_none_79b8e15260e79604.manifest

File version

Not Applicable

File size

1,661

Date (UTC)

06-Mar-2010

Time (UTC)

03:39

Platform

Not Applicable

File name

Amd64_mpio.inf_31bf3856ad364e35_6.0.6002.22355_none_7b9082265e19a1bd.manifest

File version

Not Applicable

File size

1,661

Date (UTC)

06-Mar-2010

Time (UTC)

03:39

Platform

Not Applicable

File name

Update.mum

File version

Not Applicable

File size

3,092

Date (UTC)

06-Mar-2010

Time (UTC)

03:38

Platform

Not Applicable

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

File name

Ia64_mpio.inf_31bf3856ad364e35_6.0.6001.22649_none_1d9be9c4a8882dca.manifest

File version

Not Applicable

File size

1,660

Date (UTC)

06-Mar-2010

Time (UTC)

03:39

Platform

Not Applicable

File name

Ia64_mpio.inf_31bf3856ad364e35_6.0.6002.22355_none_1f738a98a5ba3983.manifest

File version

Not Applicable

File size

1,660

Date (UTC)

06-Mar-2010

Time (UTC)

03:39

Platform

Not Applicable

File name

Update.mum

File version

Not Applicable

File size

2,249

Date (UTC)

06-Mar-2010

Time (UTC)

03:38

Platform

Not Applicable

Additional file information for Windows Server 2008 R2

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

File name

Amd64_mpio.inf_31bf3856ad364e35_6.1.7600.20853_none_79cfe1d5c20c53fa.manifest

File version

Not Applicable

File size

2,073

Date (UTC)

09-Dec-2010

Time (UTC)

07:00

Platform

Not Applicable

File name

Update.mum

File version

Not Applicable

File size

2,064

Date (UTC)

10-Dec-2010

Time (UTC)

00:20

Platform

Not Applicable

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

File name

Ia64_mpio.inf_31bf3856ad364e35_6.1.7600.20853_none_1db2ea4809acebc0.manifest

File version

Not Applicable

File size

2,071

Date (UTC)

09-Dec-2010

Time (UTC)

06:51

Platform

Not Applicable

File name

Update.mum

File version

Not Applicable

File size

1,445

Date (UTC)

10-Dec-2010

Time (UTC)

00:20

Platform

Not Applicable

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