A Volume Shadow Copy Service (VSS) update-2 package is available


A hotfix update-2 package for the Volume Shadow Copy service for Microsoft Windows Server 2003 is available. This update package includes all previously released VSS related fixes plus fixes for the following specific symptoms:

  • When you use the Shadow Copies of Shared Folders feature on a Microsoft Windows Server 2003 cluster, your shadow copies may be lost when you move groups between nodes.

    When this problem occurs, the following error message may also appear in the Application event log:

    Event Type:Error
    Event Source:VolSnap
    Event Category:None
    Event ID: 5
    The shadow copy of volume volume could not be created due to insufficient non-paged memory pool for a bitmap structure

  • You may not be able to create volume shadow copies on large volumes. Smaller volumes are not affected by this issue. Events 28, 20, and 7001 that are similar to the following are logged in the System event log:

    Event Type: Error
    vent Source: VolSnap
    Event Category: None
    Event ID: 28
    The shadow copy of volume Letter: could not be created due to a failure in creating the necessary on disk structures.
    Data: 0000: 00000000 00580002 00000000 c006001c 0010: 00000000 c000009a 00000014 00000000 0020: 00000000 00000000

    Event Type: Error
    Event Source: VolSnap
    Event Category: None
    Event ID: 20
    The shadow copies of volume Letter: were aborted because of a failed free space computation.
    Data: 0000: 00000000 00580002 00000000 c0060014 0010: 00000002 c000009a 00000013 00000000 0020: 00000000 00000000
    The above are caused by resource problems 0xC000009A STATUS_INSUFFICIENT_RESOURCES = Insufficient system resources exist to complete the API.

    Note This problem may be temporarily resolved by restarting the computer.
  • After you restart your Windows Server 2003-based computer, your Volume Shadow Copy service snapshots are lost.


This problem occurs because of a problem with non-paged pool allocation. This problem may occur if the difference (diff) area volume is not available after startup.


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, 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: 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.


No prerequisites are required.

Restart requirement

You must restart your computer after you apply this hotfix.

Hotfix replacement information

This hotfix replaces the hotfix that is described in the following Microsoft Knowledge Base article:
833167 A Volume Shadow Copy Service (VSS) update package is available for Windows Server 2003

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 2003, 32-bit versions

Date Time Version Size File name
02-Feb-2005 04:32 5.2.3790.262 59,392 Clusdisk.sys
02-Feb-2005 04:28 5.2.3790.262 225,280 Dmadmin.exe
02-Feb-2005 17:46 5.2.3790.262 1,055,744 Esent.dll
02-Feb-2005 04:27 5.2.3790.262 129,536 Ftdisk.sys
02-Feb-2005 04:27 5.2.3790.262 273,920 Swprv.dll
02-Feb-2005 04:27 5.2.3790.262 141,312 Volsnap.sys
02-Feb-2005 04:27 5.2.3790.262 131,584 Vssadmin.exe
02-Feb-2005 04:27 5.2.3790.262 544,768 Vssapi.dll
02-Feb-2005 17:46 5.2.3790.262 130,560 Vssui.dll
02-Feb-2005 04:27 5.2.3790.262 663,552 Vssvc.exe
02-Feb-2005 17:46 5.2.3790.257 18,432 Vss_ps.dll
02-Feb-2005 04:24 5.2.3790.262 59,392 Ws03res.dll

Windows Server 2003, 64-bit version

Date Time Version Size File name Platform
01-Feb-2005 00:33 5.2.3790.261 181,760 Clusdisk.sys
01-Feb-2005 00:26 5.2.3790.261 658,944 Dmadmin.exe IA-64
02-Feb-2005 17:46 5.2.3790.261 2,606,080 Esent.dll IA-64
01-Feb-2005 00:25 5.2.3790.261 448,000 Ftdisk.sys
02-Feb-2005 17:46 5.2.3790.261 706,048 Swprv.dll IA-64
01-Feb-2005 00:26 5.2.3790.261 418,816 Volsnap.sys
01-Feb-2005 00:26 5.2.3790.261 284,672 Vssadmin.exe IA-64
02-Feb-2005 17:46 5.2.3790.261 1,351,168 Vssapi.dll IA-64
02-Feb-2005 17:46 5.2.3790.261 361,472 Vssui.dll IA-64
01-Feb-2005 00:26 5.2.3790.261 1,793,536 Vssvc.exe IA-64
02-Feb-2005 17:46 5.2.3790.257 28,160 Vss_ps.dll IA-64
01-Feb-2005 00:20 5.2.3790.261 58,880 Ws03res.dll IA-64
02-Feb-2005 17:46 5.2.3790.262 544,768 Wvssapi.dll x86
02-Feb-2005 17:46 5.2.3790.257 18,432 Wvss_ps.dll x86
02-Feb-2005 04:24 5.2.3790.262 59,392 Wws03res.dll x86


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

More Information

For more information about the standard terminology that is used to describe Microsoft software updates, 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

For more information about related topics, click the following article numbers to view the articles in the Microsoft Knowledge Base:

833167 A Volume Shadow Copy Service (VSS) update package is available for Windows Server 2003

838864 A backup or a restore operation of Exchange 2003 storage groups fails with event IDs 9609 and 9611 when you use Windows Server 2003 Volume Shadow Copy Service

884055 Your system stops responding when you continuously create and then delete Volume Shadow Copy Service snapshots in Windows Server 2003

867686 The system runs out of paged pool, the system uses a high amount of memory, or the system stops responding when you use Volume Shadow Copy Service in Windows Server 2003