Microsoft KB Archive/834786

= Windows Storage Server 2003 relies on the controller cache to improve data write performance =

PSS ID Number: 834786

Article Last Modified on 4/3/2004

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The information in this article applies to:


 * Microsoft Windows Storage Server 2003

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In Microsoft Services for UNIX versions 2.2 and 2.3, you can transfer large files by using Server for NFS and by changing the following registry key: The default value for the the write caching option is caching off, set to 0. To turn on write caching, set the value to 1.

However, in Microsoft Windows Storage Server 2003, you have to set the controller cache on the computer as follows:
 * 100% write and 0% read
 * 50% write and 50% read



MORE INFORMATION
The implementation of Cache Manager in Microsoft Windows Server 2003 differs from the implementation of Cache Manager in Microsoft Windows 2000.

The changes in the implementation in Windows Server 2003 affect the performance in Services for NFS if Services for NFS relies on Cache Manager to cache write operation. Therefore, the version of Services for NFS that is included with Network Attached Storage 3.0 no longer relies on Cache Manager for write caching. Instead, Services for NFS always writes data directly to the disk.

This change in Cache Manager in Microsoft Windows Server 2003 also means that you no longer have to use the following registry attribute to control write caching:  Instead, to improve write performance, Services for NFS now relies on the write caching capabilities of the disk controller.

Additional query words: NAS 3.0 Performance

Keywords: kbinfo KB834786

Technology: kbAudDeveloper kbSAKSearch kbWinStorServ2003 kbWinStorServSearch

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