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Article ID: 2842111 - Last Review: October 23, 2013 - Revision: 3.0

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Symptoms

Considering the following scenario:
  • You have a Windows Server 2012 failover cluster that is configured by using continuously available file shares.
  • An I/O stress test is running on a Windows 8 or Windows Server 2012-based client against the failover cluster. The stress test has a high ratio of open and close operations to data operations. For example, the test repeatedly opens a file on the file share, reads the file, and then closes the file.

    Note This scenario may be found in stress tests but does not map directly to customer-usage scenarios.
In this scenario, you may experience I/O errors during failover. Additionally, the following event may be logged in the System log:


Event ID: 50
Event Source: Mup
Description: {Delayed Write Failed} Windows was unable to save all the data from the file <file name>.The data has been lost. This error may be caused by a failure of your computer hardware or network connection. Please try to save this file elsewhere.

Cause

When a file on the file share is opened, a file handle is created. After the file is closed, the Server Message Block (SMB) redirector will cache the file handle for a short time. However, there is a limit on the number of handles that can be cached in this manner. During the stress test, the SMB scavenger can fall behind in closing the cached handles. This may result in a large backlog of handles. Eventually, the number of handles exceeds the limit that can be failed over within the continuous availability time-out and some I/O operations may fail. By default, the continuous availability time-out is 60 seconds.

Resolution

This hotfix is also available at Microsoft Update Catalog (http://catalog.update.microsoft.com/v7/site/Search.aspx?q=2842111) .

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=support (http://support.microsoft.com/contactus/?ws=support)
Note 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 Windows 8 or Windows Server 2012.

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

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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 8 and Windows Server 2012 file information notes
Important Windows 8 and Windows Server 2012 hotfixes are included in the same packages. However, only "Windows 8" is listed on the Hotfix Request page. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows 8" on the page. Always refer to the "Applies To" section in articles to determine the actual operating system that each hotfix applies to.
  • The files that apply to a specific product, milestone (RTM,SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table:
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    VersionProductMilestoneService branch
    6.2.920 0.20 xxxWindows 8 and Windows Server 2012RTMLDR
  • 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 8 and for Windows Server 2012" 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 x86-based versions of Windows 8
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File nameFile versionFile sizeDateTimePlatform
Rdbss.sys6.2.9200.20794321,02410-Aug-201303:22x86
Mrxsmb20.sys6.2.9200.20794168,96010-Aug-201303:23x86
Mrxsmb.sys6.2.9200.20794307,20010-Aug-201303:21x86
For all supported x64-based versions of Windows 8 and of Windows Server 2012
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File nameFile versionFile sizeDateTimePlatform
Rdbss.sys6.2.9200.20794422,40010-Aug-201304:06x64
Mrxsmb20.sys6.2.9200.20794214,52810-Aug-201304:07x64
Mrxsmb.sys6.2.9200.20794365,05610-Aug-201304:04x64
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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.

More information

You can use the following Windows PowerShell command to obtain the number of handles on the SMB client:
Get-SmbConnection
When the issue occurs, the number of handles is much more than expected. For example, you may see more than 10,000 handles although the expected number is about 100 handles.

Hardware configuration and performance may affect the threshold at which the issue occurs.

For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684  (http://support.microsoft.com/kb/824684/ ) Description of the standard terminology that is used to describe Microsoft software updates

Additional file information

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Additional file information for Windows 8 and for Windows Server 2012

Additional files for all supported x86-based versions of Windows 8
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File propertyValue
File nameX86_15957f8344f16cc8f1b29e9aa2e96ac8_31bf3856ad364e35_6.2.9200.20794_none_d92a086cc5e2e4e9.manifest
File versionNot applicable
File size693
Date (UTC)10-Aug-2013
Time (UTC)13:51
PlatformNot applicable
File nameX86_193dff2918662525f306e6de1687bb8c_31bf3856ad364e35_6.2.9200.20794_none_733bdd156b91a087.manifest
File versionNot applicable
File size698
Date (UTC)10-Aug-2013
Time (UTC)13:51
PlatformNot applicable
File nameX86_6b448ac11a57651831a9ba1eec752637_31bf3856ad364e35_6.2.9200.20794_none_0190772db130a6d4.manifest
File versionNot applicable
File size701
Date (UTC)10-Aug-2013
Time (UTC)13:51
PlatformNot applicable
File nameX86_microsoft-windows-rdbss_31bf3856ad364e35_6.2.9200.20794_none_56feb63e4bf5e785.manifest
File versionNot applicable
File size22,921
Date (UTC)10-Aug-2013
Time (UTC)05:07
PlatformNot applicable
File nameX86_microsoft-windows-smb20-minirdr_31bf3856ad364e35_6.2.9200.20794_none_8804d40d745258e7.manifest
File versionNot applicable
File size4,096
Date (UTC)10-Aug-2013
Time (UTC)05:07
PlatformNot applicable
File nameX86_microsoft-windows-smbminirdr_31bf3856ad364e35_6.2.9200.20794_none_7cbb4ba73ba9e714.manifest
File versionNot applicable
File size57,195
Date (UTC)10-Aug-2013
Time (UTC)05:06
PlatformNot applicable
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Additional files for all supported x64-based versions of Windows 8 and of Windows Server 2012
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File propertyValue
File nameAmd64_425c30db1d1e500fc847f5b0746a5fc8_31bf3856ad364e35_6.2.9200.20794_none_a3da1928b7b79706.manifest
File versionNot applicable
File size702
Date (UTC)10-Aug-2013
Time (UTC)13:53
PlatformNot applicable
File nameAmd64_4f0c0afd0d218a6fa0ca3d56db22dffb_31bf3856ad364e35_6.2.9200.20794_none_2f60587d22f5a587.manifest
File versionNot applicable
File size697
Date (UTC)10-Aug-2013
Time (UTC)13:53
PlatformNot applicable
File nameAmd64_7cc6caa2bd99269dc2057f6cf364a82e_31bf3856ad364e35_6.2.9200.20794_none_c7417d8366fa082e.manifest
File versionNot applicable
File size705
Date (UTC)10-Aug-2013
Time (UTC)13:53
PlatformNot applicable
File nameAmd64_microsoft-windows-rdbss_31bf3856ad364e35_6.2.9200.20794_none_b31d51c2045358bb.manifest
File versionNot applicable
File size22,927
Date (UTC)10-Aug-2013
Time (UTC)07:29
PlatformNot applicable
File nameAmd64_microsoft-windows-smb20-minirdr_31bf3856ad364e35_6.2.9200.20794_none_e4236f912cafca1d.manifest
File versionNot applicable
File size4,100
Date (UTC)10-Aug-2013
Time (UTC)07:29
PlatformNot applicable
File nameAmd64_microsoft-windows-smbminirdr_31bf3856ad364e35_6.2.9200.20794_none_d8d9e72af407584a.manifest
File versionNot applicable
File size57,199
Date (UTC)10-Aug-2013
Time (UTC)07:28
PlatformNot applicable
File nameUpdate.mum
File versionNot applicable
File size1,604
Date (UTC)10-Aug-2013
Time (UTC)13:53
PlatformNot applicable
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Applies to
  • Windows Server 2012 Datacenter
  • Windows Server 2012 Standard
  • Windows 8
Keywords: 
kbexpertiseadvanced kbsurveynew kbautohotfix kbhotfixserver kbqfe kbfix KB2842111
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