Shared Hyper-V virtual disk is inaccessible when it's located in Storage Spaces on a Windows Server 2012 R2-based computer

Symptoms
A shared Hyper-V virtual disk (VHDX) is inaccessible, and I/O errors occur on Storage Spaces disks that are located on a server that's running Windows Server 2012 R2. This problem occurs when the logical sector size and the physical sector size values do not match. An example would be if you are using disks together with a native sector size of 4 KB and the Storage Spaces virtual disk was created specifying 512 bytes.
Resolution

Hotfix information

A supported hotfix is available from Microsoft Support. 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, go to the following Microsoft website: 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 update in Windows Server 2012 R2, you must first have update 2919355 installed.

Restart requirement

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

Hotfix replacement information

This hotfix does not replace any 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 2012 R2 file information and notes

Important Windows 8.1 and Windows Server 2012 R2 hotfixes are included in the same packages. However, only "Windows 8.1" 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 8.1" 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.
    VersionProductMilestoneService branch
    6.3.960 0.18 xxxWindows Server 2012 R2RTMGDR
  • 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 8.1 and Windows Server 2012 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 2012 R2
File nameFile versionFile sizeDateTimePlatform
Csvfs.sys6.3.9600.18000671,74430-Jul-201518:46x64
Svhdxflt.sys6.3.9600.18000155,13630-Jul-201518:47x64
Mrxsmb20.sys6.3.9600.18001202,24001-Aug-201503:37x64
Mrxsmb.sys6.3.9600.18001401,40801-Aug-201503:48x64
Srv2.sys6.3.9600.18001676,86401-Aug-201503:48x64

Additional file information for Windows Server 2012 R2

Additional files for all supported x64-based versions of Windows Server 2012 R2
File propertyValue
File nameAmd64_57b8df6957c0a22d1039dd4296f4e7f9_31bf3856ad364e35_6.3.9600.18001_none_c67ebeea4a37ab03.manifest
File versionNot applicable
File size704
Date (UTC)01-Aug-2015
Time (UTC)11:26
PlatformNot applicable
File nameAmd64_e31e87165d090f3a8fe167038d540d50_31bf3856ad364e35_6.3.9600.18001_none_1067d7c9d8f4c3cb.manifest
File versionNot applicable
File size721
Date (UTC)01-Aug-2015
Time (UTC)11:26
PlatformNot applicable
File nameAmd64_e7f2b97e1bf4cd07ac67be58432bcd8d_31bf3856ad364e35_6.3.9600.18001_none_29e3b15d1f0734c8.manifest
File versionNot applicable
File size718
Date (UTC)01-Aug-2015
Time (UTC)11:26
PlatformNot applicable
File nameAmd64_f5bf88b78389c0891a4ed79ef1a86168_31bf3856ad364e35_6.3.9600.18001_none_34ed3ac92133606c.manifest
File versionNot applicable
File size1,049
Date (UTC)01-Aug-2015
Time (UTC)11:26
PlatformNot applicable
File nameAmd64_microsoft-windows-f..rcluster-csvfs-core_31bf3856ad364e35_6.3.9600.18001_none_c748818a3326def6.manifest
File versionNot applicable
File size3,087
Date (UTC)01-Aug-2015
Time (UTC)05:55
PlatformNot applicable
File nameAmd64_microsoft-windows-f..uster-svhdxflt-core_31bf3856ad364e35_6.3.9600.18001_none_cbdca68719f3c2d2.manifest
File versionNot applicable
File size4,505
Date (UTC)01-Aug-2015
Time (UTC)05:54
PlatformNot applicable
File nameAmd64_microsoft-windows-smb20-minirdr_31bf3856ad364e35_6.3.9600.18001_none_7beca0e65d7ef7aa.manifest
File versionNot applicable
File size4,100
Date (UTC)01-Aug-2015
Time (UTC)05:55
PlatformNot applicable
File nameAmd64_microsoft-windows-smbminirdr_31bf3856ad364e35_6.3.9600.18001_none_70a3188024d685d7.manifest
File versionNot applicable
File size95,617
Date (UTC)01-Aug-2015
Time (UTC)05:54
PlatformNot applicable
File nameAmd64_microsoft-windows-smbserver-v2_31bf3856ad364e35_6.3.9600.18001_none_cafe44b9ca34ca7a.manifest
File versionNot applicable
File size259,948
Date (UTC)01-Aug-2015
Time (UTC)05:54
PlatformNot applicable
File nameUpdate.mum
File versionNot applicable
File size1,820
Date (UTC)01-Aug-2015
Time (UTC)11:26
PlatformNot applicable
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
References
Learn about the terminology that Microsoft uses to describe software updates.
Properties

Article ID: 3025091 - Last Review: 09/28/2015 02:56:00 - Revision: 6.0

Windows Server 2012 R2 Datacenter, Windows Server 2012 R2 Essentials, Windows Server 2012 R2 Foundation, Windows Server 2012 R2 Standard

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