Microsoft KB Archive/924726

= The size of the $vds$.log file grows quickly when a RAW hard disk is connected to a Windows Server 2003-based computer =

Article ID: 924726

Article Last Modified on 10/11/2007

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APPLIES TO


 * Microsoft Windows Server 2003, Standard Edition (32-bit x86)
 * Microsoft Windows Server 2003, Enterprise Edition
 * Microsoft Windows Server 2003, Datacenter Edition (32-bit x86)
 * Microsoft Windows Server 2003, Web Edition
 * Microsoft Windows Server 2003, Standard x64 Edition
 * Microsoft Windows Server 2003, Enterprise x64 Edition
 * Microsoft Windows Server 2003, Datacenter x64 Edition
 * Microsoft Windows Server 2003, Datacenter Edition for Itanium-Based Systems

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SYMPTOMS
Consider the following scenario:
 * You have a RAW hard disk that is connected to a Microsoft Windows Server 2003-based computer.
 * The Indexing Service is enabled.
 * Logging is enabled for the Virtual Disk Service (VDS).

In this scenario, the size of the $vds$.log file may grow quickly when many copies of the following entry are logged:

INFO: VDS(0X02040002): WM_DEVICECHANGE: wParam=32774 lParam=13893024

TRACE: TMP: GUID_IO_VOLUME_MOUNT event received.



CAUSE
This problem occurs because of the way in which the Indexing Service processes notifications that are sent by Plug and Play.

When a RAW volume is mounted, a notification is sent by Plug and Play. The Indexing Service processes the notification by opening a handle to the RAW disk device and closing the handle. The RAW disk driver mounts the RAW volume the first time that a handle for a RAW disk device is opened. The driver dismounts the RAW volume when the last handle for the RAW disk device is closed. Therefore, RAW volume mount notification is sent repeatedly.

VDS also processes a RAW volume mount notification from Plug and Play by logging information to the $vds$.log file. This behavior causes the size of the $vds$.log file to grow quickly.

The initial RAW volume mount notification may occur because Disk Management calls VDS to obtain information about a RAW disk. This behavior causes VDS to open a handle to a RAW disk device.



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section. Microsoft is researching this problem and will post more information in this article when the information becomes available.



MORE INFORMATION
For more information about how to enable logging for the Virtual Disk Service, click the following article number to view the article in the Microsoft Knowledge Base:

842011 How to turn on logging for the VDS in Windows Server 2003

Keywords: kbtshoot kbserver kbprb KB924726

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