User`s guide

8 – Windows NT Driver Installation

System Registry Parameters

FC2354601-00 E 8-3

8.3.3

Updating the Windows NT Driver

Perform the following steps if a Windows NT driver is already installed on a Fibre

Channel hard disk attached to a QLA23xx HBA and you want to install an updated

version of the driver.

NOTE: This procedure does not modify the current registry parameters for the

QLA2300.SYS Windows NT driver.

1. Open a DOS command prompt window.

2. Change the current directory to the Windows NT driver directory. For example:

cd \Winnt\System32\Drivers

3. Make a backup copy of the old driver. You can copy the file into the same

directory with a .SAV extension indicating that it is the saved file. For example:

copy Ql2300.sys Ql2300.sav

4. Insert the driver disk created in section 8.2.

5. Copy the new driver over the old driver. For example:

copy A:\Nt\Ql2300.sys

6. Remove the disk that contains the QLogic driver.

7. Restart your system to load the updated driver.

8.4

System Registry Parameters

The available driver parameters are listed below and described in the following

sections:

n MaximumSGList

n NumberOfRequests

n LargeLuns

n UseSameNN

8.4.1

MaximumSGList

Windows NT includes enhanced scatter/gather list support for doing large SCSI I/O

transfers. Windows NT supports up to 256 scatter/gather segments of 4096 bytes

each, allowing transfers up to 1048576 bytes.

NOTE: OEMSETUP.INF automatically updates the registry to support

33 scatter/gather segments. This setting provides the best overall

performance.