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3 – Windows 2000 Driver Installation
System Registry Parameters
IS0053301-00 D 3-5
Q
NOTE: You do not have to use the Device Manager or the Hardware Wizard to
uninstall the QLA40xx HBA. After you have removed the QLA40xx HBA
and restarted your computer, Windows 2000 recognizes that it has been
removed.
3.6
System Registry Parameters
The following system registry parameters are available with the QLA40xx HBA:
■ MaximumSGList
■ NumberofRequests
3.6.1
MaximumSGList
Windows 2000 includes enhanced scatter/gather list support for doing large SCSI
I/O transfers. Windows 2000 supports up to 256 scatter/gather segments of
4096 bytes each, allowing transfers up to 1,048,576 bytes.
NOTE: The OEMSETUP.INF file automatically updates the registry to support
33 scatter/gather segments. This setting provides the best overall
performance.
To change this value, follow these steps:
1. Click Start, click Run, and open the REGEDT32 program.
2. Select HKEY_LOCAL_MACHINE and follow the tree structure to the QLogic
driver:
HKEY_LOCAL_MACHINE
SYSTEM
CurrentControlSet
Services
Ql4000
Parameters
Device
3. Double-click MaximumSGList:REG_DWORD:0x41.
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.