Microsoft KB Archive/324007

= Performance Decreases After Several Disk Errors =

Article ID: 324007

Article Last Modified on 10/27/2006

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APPLIES TO


 * Microsoft Windows 2000 Server
 * Microsoft Windows 2000 Professional Edition
 * Microsoft Windows 2000 Advanced Server

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This article was previously published under Q324007





SYMPTOMS
After the small computer system interface (SCSI) miniport driver returns several disk errors, the disk I/O throughput decreases. As a result, the disk class driver sends only one request to the SCSI miniport at a time. The computer does not recover from this behavior until it is restarted.



CAUSE
This problem occurs because the disk class driver keeps track of the disk errors, and if the number of errors reaches the preset threshold, the disk class driver disables the performance features to prevent additional errors.



Hotfix Information
A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that this article describes. Apply it only to systems that are experiencing this specific problem.

To resolve this problem, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:

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

Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

Prerequisites
No prerequisites are required.

Restart Requirement
You must restart your computer after you apply this hotfix.

Hotfix Replacement Information
This hotfix does not replace any other hotfixes.

File Information
The English version of this fix has the file attributes (or later) 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 tool in Control Panel.   Date         Time   Version            Size    File name --  01-Jul-2003  00:59  5.0.2195.6765      35,632  Classpnp.sys



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.



MORE INFORMATION
For additional information about how hotfix packages are named, click the following article number to view the article in the Microsoft Knowledge Base:

816915 New Naming Schema for Microsoft Windows Hotfix Packages

Additional query words: disk class error count

Keywords: kbhotfixserver kbqfe kbstoragedev kbddk kbqfe kbwin2000presp5fix kbbug kbfix kbwin2000fixnosp KB324007

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