Using Windows NT Scsi Parameters

SCSI Utilities

SY-D6IBA2Quick Start Guide

Do not edit your registry unless it is absolutely necessary. If there is an error in your registry, your computer may become nonfunctional.

Follow the instructions below to enter the registry values that affect how the Windows NT SCSI manager interprets the generic configuration information of SCSI device drivers. All SCSI host adapters installed in your system are affected by the values you enter here. A list of valid values follows.

Note: The following value keys are case-sensitive and must be entered exactly as shown.

∗DisableTaggedQueuing –A nonzero value indicates that the SCSI host adapter disabled tagged queueing for SCSI devices. The data type for this value is REG_SZ.

∗DisableSynchronousTransfers –A nonzero value indicates that the SCSI host adapter is not to initiate synchronous negotiations (but it may stall accept negotiations initiated by a SCSI target). The data type for this value is REG_SZ.

∗DisableDisconnects –A nonzero value indicates that targets are not permitted to disconnect during the execution of a SCSI command. The data type for this value is REG_DWORD.

∗MaximumLogicalUnit –This can limit the scan for connected devices on the SCSI bus. Valid values are 1 to 8 If 1 is specified, the Windows NT SCSI manager assumes that no SCSI targets support LUNs other than 0. Otherwise, LUNs from 0 to 8 are scanned during system initialization. The data type for this value is REG_DWORD.

∗Maximum SGList –Specifies the maximum number of scatter-gather elements. Valid values are 17- 255. The data type for this value is REG_DWORD.

To enter Windows NT parameters, follow these steps:

1Select [Run] from the File menu (Windows NT 3.5x), or Run from the [Start] button (Windows NT 4.0).

2Type regedt32 and press [Enter].

3Open the registry list to the following location:

\HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\aic78xx\Parameters\Device or \HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\aic78u2\Parameters\Device

If the \Parameters\Device keys already exit, skip to step 8 below to begin entering values. If the keys do not yet exist, you will need to create them by continuing with step 4.