Multipath I/O disks may disappear after you use the Hot Add Processor feature to add a new CPU to a Windows Server 2008-based computer

Multipath I/O disks may disappear after you use the Hot Add Processor feature to add a new CPU to a Windows Server 2008-based computer

Article ID : 951590
Last Review : May 14, 2008
Revision : 1.0
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SYMPTOMS

Consider the following scenario:

• Windows Server 2008 is running on a computer that supports the Hot Add Processor feature.
• The computer uses multipath I/O (MPIO) disks.
• You use the Hot Add Processor feature to add a new CPU to the computer, or you use the PnpCPU.exe tool to simulate hot addition of a new CPU.

In this scenario, the MPIO disks may disappear from the system.

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CAUSE

This problem occurs because the status of the MPIO disks is not updated as expected during plug-and-play resource rebalance.

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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 this specific problem. 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, submit a request to Microsoft Online Customer Services to obtain the hotfix. To submit an online request to obtain the hotfix, visit the following Microsoft Web site:

http://go.microsoft.com/?linkid=6294451 (http://go.microsoft.com/?linkid=6294451)

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. To create a separate service request, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support (http://support.microsoft.com/contactus/?ws=support)

Note The Hotfix download available section and the online request forms display 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 English 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 Server 2008, 32-bit editions
File name File version File size Date Time Platform
Package_1_for_kb951590~31bf3856ad364e35~x86~~6.0.1.0.mum Not Applicable 1,776 19-Apr-2008 17:34 Not Applicable
Package_2_for_kb951590~31bf3856ad364e35~x86~~6.0.1.0.mum Not Applicable 1,943 19-Apr-2008 17:34 Not Applicable
Package_3_for_kb951590~31bf3856ad364e35~x86~~6.0.1.0.mum Not Applicable 1,781 19-Apr-2008 17:34 Not Applicable
Package_4_for_kb951590~31bf3856ad364e35~x86~~6.0.1.0.mum Not Applicable 1,781 19-Apr-2008 17:34 Not Applicable
Package_for_kb951590_client_1~31bf3856ad364e35~x86~~6.0.1.0.mum Not Applicable 1,367 19-Apr-2008 17:34 Not Applicable
Package_for_kb951590_client~31bf3856ad364e35~x86~~6.0.1.0.mum Not Applicable 1,431 19-Apr-2008 17:34 Not Applicable
Package_for_kb951590_sc_0~31bf3856ad364e35~x86~~6.0.1.0.mum Not Applicable 1,421 19-Apr-2008 17:34 Not Applicable
Package_for_kb951590_sc~31bf3856ad364e35~x86~~6.0.1.0.mum Not Applicable 1,423 19-Apr-2008 17:34 Not Applicable
Package_for_kb951590_server_0~31bf3856ad364e35~x86~~6.0.1.0.mum Not Applicable 1,425 19-Apr-2008 17:34 Not Applicable
Package_for_kb951590_server~31bf3856ad364e35~x86~~6.0.1.0.mum Not Applicable 1,431 19-Apr-2008 17:34 Not Applicable
Package_for_kb951590_winpesrv_0~31bf3856ad364e35~x86~~6.0.1.0.mum Not Applicable 1,422 19-Apr-2008 17:34 Not Applicable
Package_for_kb951590_winpesrv~31bf3856ad364e35~x86~~6.0.1.0.mum Not Applicable 1,429 19-Apr-2008 17:34 Not Applicable
X86_fedb605b00b19a1c71f8c76eba0f5dd4_31bf3856ad364e35_6.0.6001.22162_none_9a8a9bdc1f5bd4bf.manifest Not Applicable 696 19-Apr-2008 17:34 Not Applicable
X86_microsoft-windows-classpnp_31bf3856ad364e35_6.0.6001.22162_none_15cdec72c55e4f60.manifest Not Applicable 4,355 18-Apr-2008 05:46 Not Applicable
Classpnp.sys 6.0.6001.22162 127,544 18-Apr-2008 05:33 x86
Stortrace.mof Not Applicable 17,937 18-Dec-2007 21:09 Not Applicable
Windows Server 2008, 64-bit editions
File name File version File size Date Time Platform
Amd64_a4c6d13947978089f5a07126a33242c3_31bf3856ad364e35_6.0.6001.22162_none_f06c64be09febed9.manifest Not Applicable 700 19-Apr-2008 17:34 Not Applicable
Amd64_microsoft-windows-classpnp_31bf3856ad364e35_6.0.6001.22162_none_71ec87f67dbbc096.manifest Not Applicable 4,361 18-Apr-2008 06:55 Not Applicable
Package_1_for_kb951590~31bf3856ad364e35~amd64~~6.0.1.0.mum Not Applicable 1,786 19-Apr-2008 17:34 Not Applicable
Package_2_for_kb951590~31bf3856ad364e35~amd64~~6.0.1.0.mum Not Applicable 1,955 19-Apr-2008 17:34 Not Applicable
Package_3_for_kb951590~31bf3856ad364e35~amd64~~6.0.1.0.mum Not Applicable 1,791 19-Apr-2008 17:34 Not Applicable
Package_4_for_kb951590~31bf3856ad364e35~amd64~~6.0.1.0.mum Not Applicable 1,791 19-Apr-2008 17:34 Not Applicable
Package_for_kb951590_client_1~31bf3856ad364e35~amd64~~6.0.1.0.mum Not Applicable 1,375 19-Apr-2008 17:34 Not Applicable
Package_for_kb951590_client~31bf3856ad364e35~amd64~~6.0.1.0.mum Not Applicable 1,439 19-Apr-2008 17:34 Not Applicable
Package_for_kb951590_sc_0~31bf3856ad364e35~amd64~~6.0.1.0.mum Not Applicable 1,429 19-Apr-2008 17:34 Not Applicable
Package_for_kb951590_sc~31bf3856ad364e35~amd64~~6.0.1.0.mum Not Applicable 1,431 19-Apr-2008 17:34 Not Applicable
Package_for_kb951590_server_0~31bf3856ad364e35~amd64~~6.0.1.0.mum Not Applicable 1,433 19-Apr-2008 17:34 Not Applicable
Package_for_kb951590_server~31bf3856ad364e35~amd64~~6.0.1.0.mum Not Applicable 1,439 19-Apr-2008 17:34 Not Applicable
Package_for_kb951590_winpesrv_0~31bf3856ad364e35~amd64~~6.0.1.0.mum Not Applicable 1,430 19-Apr-2008 17:34 Not Applicable
Package_for_kb951590_winpesrv~31bf3856ad364e35~amd64~~6.0.1.0.mum Not Applicable 1,437 19-Apr-2008 17:34 Not Applicable
Classpnp.sys 6.0.6001.22162 165,432 18-Apr-2008 06:44 x64
Stortrace.mof Not Applicable 17,937 18-Dec-2007 21:10 Not Applicable
Windows Server 2008, Itanium-based versions
File name File version File size Date Time Platform
Ia64_0428ad75595bfd6945858b8c87a8a2d6_31bf3856ad364e35_6.0.6001.22162_none_ac97a9cc819d98e0.manifest Not Applicable 698 19-Apr-2008 17:34 Not Applicable
Ia64_microsoft-windows-classpnp_31bf3856ad364e35_6.0.6001.22162_none_15cf9068c55c585c.manifest Not Applicable 4,358 18-Apr-2008 11:45 Not Applicable
Package_1_for_kb951590~31bf3856ad364e35~ia64~~6.0.1.0.mum Not Applicable 1,781 19-Apr-2008 17:34 Not Applicable
Package_2_for_kb951590~31bf3856ad364e35~ia64~~6.0.1.0.mum Not Applicable 1,786 19-Apr-2008 17:34 Not Applicable
Package_3_for_kb951590~31bf3856ad364e35~ia64~~6.0.1.0.mum Not Applicable 1,786 19-Apr-2008 17:34 Not Applicable
Package_for_kb951590_sc_0~31bf3856ad364e35~ia64~~6.0.1.0.mum Not Applicable 1,425 19-Apr-2008 17:34 Not Applicable
Package_for_kb951590_sc~31bf3856ad364e35~ia64~~6.0.1.0.mum Not Applicable 1,426 19-Apr-2008 17:34 Not Applicable
Package_for_kb951590_server_0~31bf3856ad364e35~ia64~~6.0.1.0.mum Not Applicable 1,429 19-Apr-2008 17:34 Not Applicable
Package_for_kb951590_server~31bf3856ad364e35~ia64~~6.0.1.0.mum Not Applicable 1,434 19-Apr-2008 17:34 Not Applicable
Package_for_kb951590_winpesrv_0~31bf3856ad364e35~ia64~~6.0.1.0.mum Not Applicable 1,426 19-Apr-2008 17:34 Not Applicable
Package_for_kb951590_winpesrv~31bf3856ad364e35~ia64~~6.0.1.0.mum Not Applicable 1,433 19-Apr-2008 17:34 Not Applicable
Classpnp.sys 6.0.6001.22162 346,168 18-Apr-2008 10:36 IA-64
Stortrace.mof Not Applicable 17,937 18-Dec-2007 21:09 Not Applicable

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STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the Applies to section.

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MORE INFORMATION

PnpCPU.exe is a command-line tool that simulates the hot addition of processors to a running instance of Windows Server 2008. This tool is included in the Windows Driver Kit (WDK). For more information, visit the following Microsoft Web site:

http://msdn2.microsoft.com/en-us/library/aa906538.aspx (http://msdn2.microsoft.com/en-us/library/aa906538.aspx)

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

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APPLIES TO
• Windows Server 2008 Datacenter
• Windows Server 2008 for Itanium-Based Systems
• Windows Server 2008 Datacenter without Hyper-V

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Keywords: 
kbexpertiseinter kbautohotfix kbbug kbfix kbhotfixserver kbqfe KB951590

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Microsoft Knowledge Base Article

This article contents is Microsoft Copyrighted material.
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