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 |
