Article ID: 2853952 - View products that this article applies to.
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Symptoms

If a Windows Server 2012 or Windows Server 2008 R2-based Hyper-V host experiences an unplanned restart, and if volumes on virtual hard disks connected to a virtual IDE controller are being used by virtual machines, the virtual hard disks on that server may no longer be consistent.

For example, assume that you have a virtualized domain controller on a Hyper-V host server. When the Hyper-V host server crashes or encounters a power outage, the Active Directory database may become corrupted, or the virtual machine fails to start, and you may receive an error message that resembles the following:
c00002e2 Directory Services could not start because of the following error: %hs Error Status: 0x%x. Please shutdown this system and reboot into Directory Services Restore Mode, check the event log for more detailed information.

Cause

This issue occurs because the Hyper-V virtual IDE controller erroneously reports success if an operating system on the guest requests to disable the disk cache. This might result in an application issuing I/O operations that it believes are persisted to disk that are actually being allowed to reside in the disk cache, which would not be persisted across power failures of the Hyper-V host.

Go to the More information section for more background information.

Resolution

Note After you install this update, requests to disable the disk cache in the Hyper-V virtual IDE controller will fail. This is the expected behavior. You may receive a warning message generated by Active Directory in the guest machine operating system. This event 1539 warning message states that "Active Directory Domain Services could not disable the software-based disk write cache on the following hard disk," followed by the drive letter of the hard disk. This warning message is generated when the Hyper-V virtual IDE controller correctly refuses the request to disable the disk cache. However, Active Directory requests all database updates be completed without caching, which the Hyper-V storage subsystem ensures in order to prevent data loss from a power failure or other unexpected reboot.

Update information

Windows Server 2012

Install update rollup 2855336 on the Windows Server 2012-based Hyper-V host.

Windows Server 2008 R2

Install update 2853952 on the Windows Server 2008 R2-based Hyper-V host. Also, install update 2853952 on the guest if the guest is running Windows Server 2008 R2 or Windows 7.

This update is available from Windows Update and the Microsoft Download Center.
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Operating systemUpdate
All supported x86-based versions of Windows7
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Download
Download the update package now.
All supported x64-based versions of Windows7
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Download
Download the update package now.
All supported x64-based versions of Windows Server 2008 R2
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Download
Download the update package now.
All supported IA64-based versions of Windows Server 2008 R2
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Download
Download the update package now.
For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base:
119591 How to obtain Microsoft support files from online services
Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.

Restart requirement

A restart is required for the update to resolve this issue.

File information

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The global version of this update 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 7 and Windows Server 2008 R2 file information notes

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  • The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information" section. MUM, MANIFEST, 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 7
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File nameFile versionFile sizeDateTimePlatform
Aliide.sys1.2.0.014,40014-Jul-200901:26x86
Amdide.sys6.1.7600.1638514,91214-Jul-200901:26x86
Atapi.sys6.1.7600.1638521,58414-Jul-200901:26x86
Ataport.sys6.1.7601.18231133,05605-Aug-201301:56x86
Cmdide.sys2.0.7.015,95214-Jul-200901:26x86
Intelide.sys6.1.7600.1638515,42414-Jul-200901:20x86
Msahci.sys6.1.7601.1751428,03220-Nov-201012:30x86
Pciide.sys6.1.7600.1638512,36814-Jul-200901:20x86
Pciidex.sys6.1.7600.1638542,56014-Jul-200901:19x86
Viaide.sys6.0.6000.17016,97614-Jul-200901:19x86
Aliide.sys1.2.0.014,40014-Jul-200901:26x86
Amdide.sys6.1.7600.1638514,91214-Jul-200901:26x86
Atapi.sys6.1.7600.1638521,58414-Jul-200901:26x86
Ataport.sys6.1.7601.22414133,05605-Aug-201308:59x86
Cmdide.sys2.0.7.015,95214-Jul-200901:26x86
Intelide.sys6.1.7600.1638515,42414-Jul-200901:20x86
Msahci.sys6.1.7601.1751428,03220-Nov-201012:30x86
Pciide.sys6.1.7600.1638512,36814-Jul-200901:20x86
Pciidex.sys6.1.7600.1638542,56014-Jul-200901:19x86
Viaide.sys6.0.6000.17016,97614-Jul-200901:19x86
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For all supported x64-based versions of Windows 7 and Windows Server 2008 R2
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File nameFile versionFile sizeDateTimePlatform
Hvax64.exe6.1.7601.22414606,72005-Aug-201307:14x64
Hvboot.sys6.1.7601.22414118,20805-Aug-201308:33x64
Hvix64.exe6.1.7601.22414635,39205-Aug-201307:14x64
Vmwp.exe6.1.7601.182313,682,81605-Aug-201301:18x64
Vmwp.exe6.1.7601.224143,682,81605-Aug-201307:28x64
Aliide.sys1.2.0.015,44014-Jul-200901:52x64
Amdide.sys6.1.7600.1638515,44014-Jul-200901:52x64
Atapi.sys6.1.7600.1638524,12814-Jul-200901:52x64
Ataport.sys6.1.7601.18231155,58405-Aug-201302:25x64
Cmdide.sys2.0.7.017,48814-Jul-200901:52x64
Intelide.sys6.1.7600.1638516,96014-Jul-200901:48x64
Msahci.sys6.1.7601.1751431,10420-Nov-201013:33x64
Pciide.sys6.1.7600.1638512,35214-Jul-200901:45x64
Pciidex.sys6.1.7600.1638548,72014-Jul-200901:45x64
Viaide.sys6.0.6000.17017,48814-Jul-200901:45x64
Aliide.sys1.2.0.015,44014-Jul-200901:52x64
Amdide.sys6.1.7600.1638515,44014-Jul-200901:52x64
Atapi.sys6.1.7600.1638524,12814-Jul-200901:52x64
Ataport.sys6.1.7601.22414155,58405-Aug-201308:33x64
Cmdide.sys2.0.7.017,48814-Jul-200901:52x64
Intelide.sys6.1.7600.1638516,96014-Jul-200901:48x64
Msahci.sys6.1.7601.1751431,10420-Nov-201013:33x64
Pciide.sys6.1.7600.1638512,35214-Jul-200901:45x64
Pciidex.sys6.1.7600.1638548,72014-Jul-200901:45x64
Viaide.sys6.0.6000.17017,48814-Jul-200901:45x64
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For all supported IA-64-based versions of Windows Server 2008 R2
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File nameFile versionFile sizeDateTimePlatform
Aliide.sys1.2.0.019,02414-Jul-200901:57IA-64
Atapi.sys6.1.7600.1638544,62414-Jul-200901:57IA-64
Ataport.sys6.1.7601.18231372,16005-Aug-201301:35IA-64
Cmdide.sys2.0.7.026,70414-Jul-200901:57IA-64
Intelide.sys6.1.7600.1638521,07214-Jul-200901:58IA-64
Msahci.sys6.1.7601.1751472,06420-Nov-201010:33IA-64
Pciide.sys6.1.7600.1638515,95214-Jul-200901:58IA-64
Pciidex.sys6.1.7600.16385115,79214-Jul-200901:58IA-64
Viaide.sys6.0.6000.17027,71214-Jul-200901:56IA-64
Aliide.sys1.2.0.019,02414-Jul-200901:57IA-64
Atapi.sys6.1.7600.1638544,62414-Jul-200901:57IA-64
Ataport.sys6.1.7601.22414372,16005-Aug-201307:44IA-64
Cmdide.sys2.0.7.026,70414-Jul-200901:57IA-64
Intelide.sys6.1.7600.1638521,07214-Jul-200901:58IA-64
Msahci.sys6.1.7601.1751472,06420-Nov-201010:33IA-64
Pciide.sys6.1.7600.1638515,95214-Jul-200901:58IA-64
Pciidex.sys6.1.7600.16385115,79214-Jul-200901:58IA-64
Viaide.sys6.0.6000.17027,71214-Jul-200901:56IA-64
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Additional file information for Windows 7 and Windows Server 2008 R2

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Additional files for all supported x86-based versions of Windows 7
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File propertyValue
File nameX86_mshdc.inf_31bf3856ad364e35_6.1.7601.18231_none_df26d4d57fdef5b0.manifest
File versionNot applicable
File size6,632
Date (UTC)06-Aug-2013
Time (UTC)19:46
PlatformNot applicable
File nameX86_mshdc.inf_31bf3856ad364e35_6.1.7601.22414_none_dfc9143c98e9a6c4.manifest
File versionNot applicable
File size6,632
Date (UTC)06-Aug-2013
Time (UTC)19:46
PlatformNot applicable
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Additional files for all supported x64-based versions of Windows 7 and Windows Server 2008 R2
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File propertyValue
File nameAmd64_453b23b4799e3d18f0b6f5e824c33719_31bf3856ad364e35_6.1.7601.22414_none_f4f4b5b1e2c8c32c.manifest
File versionNot applicable
File size1,055
Date (UTC)06-Aug-2013
Time (UTC)19:42
PlatformNot applicable
File nameAmd64_f3bc7e4abef692ac454474ea9ddd5d7c_31bf3856ad364e35_6.1.7601.18231_none_f7049554b2792c32.manifest
File versionNot applicable
File size703
Date (UTC)06-Aug-2013
Time (UTC)19:42
PlatformNot applicable
File nameAmd64_microsoft-hyper-v-drivers-hypervisor_31bf3856ad364e35_6.1.7601.22414_none_8f00db0795429115.manifest
File versionNot applicable
File size4,163
Date (UTC)05-Aug-2013
Time (UTC)09:10
PlatformNot applicable
File nameAmd64_microsoft-hyper-v-vstack-vmwp_31bf3856ad364e35_6.1.7601.18231_none_934dd685767b40bb.manifest
File versionNot applicable
File size276,830
Date (UTC)05-Aug-2013
Time (UTC)02:46
PlatformNot applicable
File nameAmd64_microsoft-hyper-v-vstack-vmwp_31bf3856ad364e35_6.1.7601.22414_none_93f015ec8f85f1cf.manifest
File versionNot applicable
File size276,830
Date (UTC)05-Aug-2013
Time (UTC)09:11
PlatformNot applicable
File nameAmd64_mshdc.inf_31bf3856ad364e35_6.1.7601.18231_none_3b457059383c66e6.manifest
File versionNot applicable
File size6,636
Date (UTC)06-Aug-2013
Time (UTC)19:52
PlatformNot applicable
File nameAmd64_mshdc.inf_31bf3856ad364e35_6.1.7601.22414_none_3be7afc0514717fa.manifest
File versionNot applicable
File size6,636
Date (UTC)06-Aug-2013
Time (UTC)19:52
PlatformNot applicable
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Additional files for all supported IA-64-based versions of Windows Server 2008 R2
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File propertyValue
File nameIa64_mshdc.inf_31bf3856ad364e35_6.1.7601.18231_none_df2878cb7fdcfeac.manifest
File versionNot applicable
File size6,112
Date (UTC)06-Aug-2013
Time (UTC)19:42
PlatformNot applicable
File nameIa64_mshdc.inf_31bf3856ad364e35_6.1.7601.22414_none_dfcab83298e7afc0.manifest
File versionNot applicable
File size6,112
Date (UTC)06-Aug-2013
Time (UTC)19:42
PlatformNot 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.

More information

There are various caching layers in the virtualization stack that affect consistency semantics of applications running on the virtual machines. For more information about this, refer to KB 2801713.

Virtual hard disks report to a guest operating system that write-caching is enabled, and disks reject requests to disable write-caching that are made by the guest operating system. This behavior is necessary for the following reasons:
  • The underlying storage might have an always-on write cache that cannot be disabled. This is because the virtual disk might be migrated to a different disk on the same host (live storage migration), or to a different host (live migration).
  • Hyper-V cannot assume that all virtual machines that are running on the same disk will have the same disk cache settings.
Applications that require data integrity semantics across a power failure must ensure that writes are committed to non-volatile storage. One method to accomplish this is to disable the disk cache so that that all writes are committed to the hard disk before reporting success. If the request to disable the disk cache is refused, the application must take additional steps to ensure consistency.

Before the update is installed, when Active Directory would try to disable the disk cache, Hyper-V would incorrectly report that this operation was successful. Then, Active Directory would perform file operations under the assumption that no caching was occurring, even though caching was occurring.

After you install this update, Active Directory will try to disable the disk cache, and Hyper-V will correctly report that this is not possible. Then, Active Directory will enable FUA (Force Unit Access) to make sure the data is not cached.

When Active Directory tries to disable the disk cache, event ID 1539 is logged.

References

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

Properties

Article ID: 2853952 - Last Review: July 24, 2014 - Revision: 7.0
Applies to
  • Windows Server 2012 Standard
  • Windows Server 2012 Datacenter
  • Windows Server 2008 R2 Standard
  • Windows Server 2008 R2 Enterprise
  • Windows Server 2008 R2 Datacenter
Keywords: 
kbqfe kbhotfixserver kbfix kbexpertiseinter kbsurveynew atdownload KB2853952

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