Microsoft KB Archive/245637

= Some LARGE LUN Numbers Are Not Available to the Computer =

Article ID: 245637

Article Last Modified on 11/1/2006

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APPLIES TO


 * Microsoft Windows NT 4.0 Service Pack 5
 * Microsoft Windows NT 4.0 Service Pack 6
 * Microsoft Windows NT Workstation 4.0
 * Microsoft Windows NT Workstation 4.0 Developer Edition

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This article was previously published under Q245637



SYMPTOMS
When you configure a computer to use LARGE LUN Support, such as on a Fibre Channel controller, some of the LUNs assigned to disks or other devices are not visible to other system drivers or the computer.

Only 231 of the 256 possible LUNs are visible. The LUNs that are not visible are in the following ranges:

64 to 71

128 to 135

192 to 199

255



RESOLUTION
A supported fix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Apply it only to computers that are experiencing this specific problem.

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

http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS

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.

The English-language version of this fix should have the following file attributes or later:

  Date        Time     Size     File name     Platform 10/25/1999 01:57p   35,504   Scsiport.sys  i386 10/25/1999 01:56p   56,400   Scsiport.sys  alpha For more information on LargeLun support in Windows, click the following article number to view the article in the Microsoft Knowledge Base:

310072 Adding support for more than eight LUNs in Windows Server 2003 and in Windows 2000



STATUS
Microsoft has confirmed that this is a problem in Windows NT 4.0.

Keywords: kbhotfixserver kbqfe kbbug kbfix KB245637

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