Microsoft KB Archive/944830

= On a Windows Server 2003 R2-based computer, the Quota function of the File Server Resource Manager (FSRM) may report incorrect disk usage when both the Quota function and the shadow copies are configured on the same volume =

Article ID: 944830

Article Last Modified on 12/21/2007

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APPLIES TO


 * Microsoft Windows Server 2003 R2 Datacenter Edition (32-Bit x86)
 * Microsoft Windows Server 2003 R2 Datacenter x64 Edition
 * Microsoft Windows Server 2003 R2 Enterprise Edition (32-Bit x86)
 * Microsoft Windows Server 2003 R2 Enterprise x64 Edition
 * Microsoft Windows Server 2003 R2 Standard Edition (32-bit x86)
 * Microsoft Windows Server 2003 R2 Standard x64 Edition

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SYMPTOMS
Consider the following scenario:
 * On a Windows Server 2003 R2-based computer, you create a Quota function to manage disk usage on a volume in the File Server Resource Manager (FSRM).
 * You enable the Shadow Copies feature on the volume.

Note When you enable the Shadow Copies feature on the volume, a shadow copy is created on this volume.

In this scenario, the Quota function can correctly report the disk usage. However, if multiple shadow copies are created on this volume, the Quota function incorrectly reports the disk usage.

For example, when the first shadow copy is created, FSRM correctly reports that 300 MB of disk space is used. When the second shadow copy is created, the actual used disk space is more than 300 MB. However, FSRM reports that only 600 MB disk of space is used for these two shadow copies.

Additionally, when this problem occurs, the following information may be logged in the event log: Event Type:  Warning Event Source:  SRMSVC Event Category: None Event ID:  12325 Date:       Time:       User:      N/A Computer:   Description: The 120% quota threshold for quota on E:\ on server has been exceeded. The quota limit is MB and the current usage is MB (120% of limit).



CAUSE
This problem occurs because the Quota.sys filter driver incorrectly calculates disk space that is used by shadow copies when both Quota function and shadow copies are configured on the same volume.



Hotfix information
A supported hotfix is now 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 Windows Server 2003 service pack that contains this hotfix.

To resolve this problem, submit a request to Microsoft Online Customer Services to obtain the hotfix. To submit an online request to obtain the hotfix, visit the following Microsoft Web site:

http://go.microsoft.com/?linkid=6294451

Note If additional issues occur or 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. To create a separate service request, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Prerequisites
To apply this hotfix, you must have Windows Server 2003 R2 installed on the computer.

Restart requirement
You must restart the computer after you apply this hotfix.

Hotfix replacement information
This hotfix does not replace any other hotfixes.

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 with Service Pack 2, x64-based version
 Note To view the correct disk usage report, you must re-create all affected quotas after you install this hotfix.



WORKAROUND
To work around this problem, store the shadow copies on another disk.



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section.



MORE INFORMATION
For more information, 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

Additional query words: fsrm 12324 SRMSVC quota

Keywords: kbexpertiseadvanced kbbug kbfix kbhotfixserver kbqfe kbpubtypekc KB944830

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