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VMs may not get additional memory although they're set to use Dynamic Memory in Windows Server 2012 R2

This article describes an issue in which virtual machines (VMs) may not get additional memory although they're set to use the Dynamic Memory feature in Windows Server 2012 R2. A hotfix is available to fix this issue. Before you install this hotfix, see the Prerequisites section.
Symptoms
You experience a poor performance, and IIS servers may run out of memory at peak times.
Cause
This issue occurs because the Dynamic Memory feature for these VMs fails.

Hotfix information

Important If you install a language pack after you install this hotfix, you must reinstall this hotfix. Therefore, we recommend that you install any language packs that you need before you install this hotfix. For more information, see Add language packs to Windows.

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that's described in this article. Apply this hotfix only to systems that are experiencing this specific problem.

If the hotfix is available for download, there's a "Hotfix Download Available" section at the top of this Knowledge Base article. If this section doesn't appear, submit a request to Microsoft Customer Service and Support to get 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 don't 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 website: Note The "Hotfix Download Available" form displays the languages for which the hotfix is available. If you don't see your language, it's because a hotfix isn't available for that language.

Prerequisites

To apply this hotfix, install update 2919355 in Windows 8.1 or Windows Server 2012 R2.

Registry information

To use the hotfix in this package, you don't have to make any changes to the registry.

Restart requirement

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

Hotfix replacement information

This hotfix doesn't replace a previously released hotfix.
File Information
The English (United States) version of this software update installs files that have the attributes that are listed in the following tables. The dates and times for these files are listed in Coordinated Universal Time (UTC). Be aware that dates and times for these files on your local computer are displayed in your local time and with your current daylight saving time bias. The dates and times may also change when you perform certain operations on the files.

Windows Server 2012 R2

Notes
  • 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
  • GDR service branches contain only those fixes that are widely released to address widespread, critical issues. LDR service branches contain hotfixes in addition to widely released fixes.
  • The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed 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.
x64 Windows Server 2012 R2
File nameFile versionFile sizeDateTimePlatform
Vmwp.exe6.3.9600.180526,287,36010-Sep-201517:39x64

Additional file information

x64 Windows Server 2012 R2
File propertyValue
File nameAmd64_00205f58f65ab63068da5b06059e3290_31bf3856ad364e35_6.3.9600.18052_none_f692e837916c991f.manifest
File versionNot applicable
File size703
Date (UTC)11-Sep-2015
Time (UTC)06:23
PlatformNot applicable
File nameAmd64_microsoft-hyper-v-vstack-vmwp_31bf3856ad364e35_6.3.9600.18052_none_261d2a3f33a96431.manifest
File versionNot applicable
File size465,224
Date (UTC)10-Sep-2015
Time (UTC)19:59
PlatformNot applicable
File nameUpdate.mum
File versionNot applicable
File size2,283
Date (UTC)11-Sep-2015
Time (UTC)06:23
PlatformNot applicable
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
References
See the terminology that Microsoft uses to describe software updates.
Properties

Article ID: 3095308 - Last Review: 11/04/2015 07:06:00 - Revision: 2.0

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

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