Enabling SCSI-Tagged Command Queuing for NCR PCI SCSI Controller

Last reviewed: April 18, 1995
Article ID: Q128931

The information in this article applies to:

Microsoft Windows NT operating system version 3.1
Microsoft Windows NT Advanced Server version 3.1
Microsoft Windows NT Workstation version 3.5
Microsoft Windows NT Server version 3.5

SUMMARY

The NCR 53C810 PCI SCSI host adapter is built-in on most Dell computers and it supports SCSI-tagged command queuing. The SCSI-tagged command queuing allows a SCSI host adapter to send multiple SCSI commands to a device before receiving a response for any of the commands. If this feature is disabled (the Windows NT default), the SCSI host adapter must wait for a command response before sending another. In some environments, enabling SCSI-tagged command queuing results in improved system performance.

MORE INFORMATION

To enable SCSI-tagged command queuing for the NCR 53C810 PCI SCSI host adapter (using the NCRSDMS.SYS driver):

WARNING: Using Registry Editor incorrectly can cause serious, system-wide problems that may require you to reinstall Windows NT to correct them. Microsoft cannot guarantee that any problems resulting from the use of Registry Editor can be solved. Use this tool at your own risk.

From the HKEY_LOCAL_MACHINE subtree

Log on to Windows NT as an administrator.
Start Registry Editor (REGEDT32.EXE).
From the HKEY_LOCAL_MACHINE subtree, go to the following key:
```
      \SYSTEM\CurrentControlSet\Services\ncrsdms
```
From the Edit menu, select Add Key.
In the Key Name text box, type the following and then choose OK:
```
      Device
```
Select the Device subkey.
From the Edit menu, choose Add Value.

Enter the following:

      Value Name: DriverParameter
      Data Type:  REG_SZ
      String:     UseTags=1

Exit Registry Editor and restart Windows NT.

For more information on the NCR 53C810 PCI SCSI host adapter, refer to the SCSI Device Driver Installation and Configuration Guide shipped with the computer or contact Dell Technical Support at (800) 284-1200.

The product included here is manufactured by Dell Computer Corporation, a vendor independent of Microsoft; we make no warranty, implied or otherwise, regarding this product's performance or reliability.

KBCategory: kb3rdparty
KBSubcategory: ntconfig
Additional reference words: 3.10 3.50 prodnt

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Last reviewed: April 18, 1995
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