The log file size grows larger than the maximum file size limit that was set in Performance Monitor if you select a Comma Separated log format or a Tab Separated log format on a computer that is running Windows Server 2008 or Windows Vista

Consider the following scenario:

• You use the Data Collector Sets feature in Performance Monitor (Perfmon.exe) to collect data.
• In the Properties dialog box of a data collector set, you set a value in the Maximum Size field that is located on the Stop Condition tab. For example, you set a value of 30 megabytes (MB).
• In the Properties dialog box of a created data collector that is in the data collector set, you select Comma Separated or Tab Separated in the Log format list.
• You use Performance Monitor to collect performance counters and to save them to a log file.

In this scenario, the maximum file size limit that you set in the Maximum Size field does not work. Therefore, the log file size keeps growing over the maximum file size limit.

This problem occurs on a computer that is running one of the following operating systems:

• Windows Server 2008 Service Pack 2 (SP2)
• Windows Server 2008
• Windows Vista Service Pack 2 (SP2)
• Windows Vista Service Pack 1 (SP1)

This problem occurs because the Performance Data Helper (Pdh.dll) module does not handle the maximum file size limit correctly. This behavior occurs when the module saves collected data to one or more log files that are formatted by using the Comma Separated format or the Tab Separated format.

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 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, 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.

Important Windows Vista and Windows Server 2008 hotfixes are included in the same packages. However, only one of these products may be listed on the �Hotfix Request� page. To request the hotfix package that applies to both Windows Vista and Windows Server 2008, just select the product that is listed on the page.

Prerequisites

To apply this hotfix, the computer must be running one of the following operating systems:

• Windows Server 2008 Service Pack 2 (SP2)
• Windows Server 2008
• Windows Vista Service Pack 2 (SP2)
• Windows Vista Service Pack 1 (SP1)

Restart requirement

You must restart the computer after you apply this hotfix.

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 Vista and Windows Server 2008 file information note

• The files that apply to a specific product, SR_Level (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table.

  Version	Product	SR_Level	Service branch
  6.0.6000.16xxx	Windows Vista	RTM	GDR
  6.0.6000.20xxx	Windows Vista	RTM	LDR
  6.0.6001.18xxx	Windows Vista and Windows Server 2008	SP1	GDR
  6.0.6001.22xxx	Windows Vista and Windows Server 2008	SP1	LDR
  6.0.6002.18xxx	Windows Vista and Windows Server 2008	SP2	GDR
  6.0.6002.22xxx	Windows Vista and Windows Server 2008	SP2	LDR

• Service Pack 1 is integrated into the original release of Windows Server 2008.
• GDR service branches contain only fixes that are broadly released to address widespread, critical issues. LDR service branches contain hotfixes in addition to broadly released fixes.
• The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately. MUM and MANIFEST files, and the associated security catalog (.cat) files, are critical to maintaining the state of the updated component. The security catalog files (attributes not listed) are signed with a Microsoft digital signature.

For all supported x86-based versions of Windows Server 2008 SP2, of Windows Server 2008, of Windows Vista SP2, and of Windows Vista SP1

For all supported x64-based versions of Windows Server 2008 SP2, of Windows Server 2008, of Windows Vista SP2, and of Windows Vista SP1

For all supported Itanium-based versions of Windows Server 2008 SP2 and of Windows Server 2008 SP2

To work around this problem, use the Binary format for the log files.

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

For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:

Additional file information for Windows Server 2008 SP2, for Windows Server 2008, for Windows Vista SP2, and for Windows Vista SP1

Additional files for all supported x86-based versions of Windows Server 2008 SP2, of Windows Server 2008, of Windows Vista SP2, and of Windows Vista SP1

Additional files for all supported x64-based versions of Windows Server 2008 SP2, of Windows Server 2008, of Windows Vista SP2, and of Windows Vista SP1

Additional files for all supported Itanium-based version of Windows Server 2008 SP2 and of Windows Server 2008