Qlogic SANblade 2300 Series Podręcznik Użytkownika Pobierz pdf (Strona 127)

10 – Windows XP Driver Installation

System Registry Parameters

FC2354601-00 J 10-7

10.5.1

MaximumSGList

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

transfers. Windows XP 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.

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.

10.5.2

NumberOfRequests

The NumberOfRequests registry parameter specifies the maximum number of

outstanding requests per adapter. 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.

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Qlogic SANblade 2300 Series Podręcznik Użytkownika Strona 127