User`s guide

8 – Windows NT Driver Installation
System Registry Parameters
8-4 FC2354601-00 E
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To change this value, follow these steps:
1. Click Start, select Run, and open the REGEDT32 program.
2. Select HKEY_LOCAL_MACHINE and follow the tree structure to the
QL2300.SYS driver:
HKEY_LOCAL_MACHINE
SYSTEM
CurrentControlSet
Services
Ql2300
Parameters
Device
3. Double-click MaximumSGList:REG_DWORD:0x21.
4. Enter a value from 16 to 255 (10h to FFh). A value of 255 (FFh) enables the
maximum 1-MB transfer size. Any value above 255 enables 64K transfers. The
default value is 33 (21h).
5. Click OK.
6. Exit the REGEDT32 program, then restart the system.
8.4.2
NumberOfRequests
The NumberOfRequests registry parameter specifies the maximum number of
outstanding requests per HBA. When the QL2300.SYS driver is installed, the
registry is automatically updated with this parameter set to 150 (96h).
CAUTION!
Increasing this parameter above 150 can result in a system failure.
8.4.3
LargeLuns (Support for More Than Eight LUNs)
To support more than eight LUNs, QLogic recommends installing Windows NT
service pack 4 or higher.
The OEMSETUP.INF file has been changed to automatically update the registry to
enable up to 255 LUNs using NT 4.0 service pack 4 or higher. This update is done
using the LargeLuns parameter in the registry.
NOTE: If OS support for large LUNs is enabled, the miniport's extended LUN
support must be disabled. To disable the miniport's extended LUN
support, run Fast!UTIL and set the Luns per Target parameter to 0 (see
section 14.2.5).