Appendix C: Using Advanced Configuration Parameters
●
49
The following is a table of supported Windows Registry Settings.
Using Windows SCSI Parameters
Follow the instructions below to enter the registry values that affect how the Windows SCSI
manager interprets the generic configuration information of SCSI device drivers. Each driver
has its own key reference in the Registry. In these instructions, the Ultra320 key is used
(adpu320). All SCSI cards supported by the modified key 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.
●
MaximumLogicalUnit
—This can limit the scan for connected devices on the SCSI bus.
Valid values are 0 to 32. If 1 is specified, the Windows SCSI manager assumes that no SCSI
targets support LUNs other than LUN 0. Otherwise, LUNs from 0 to 31 are scanned during
system initialization. The data type for this value is REG_DWORD.
●
MaximumSGList
—Specifies the maximum number of Scatter/Gather elements. Valid
values are 2-255. The data type for this value is REG_DWORD.
●
NumberOfRequests
—specifies the maximum number of commands that can be delivered
to an SCSI card. Valid values are 16-255. The data type for this value is REG_DWORD.
To enter Windows parameters:
1
Select
Run
from the Start button.
2
Type
regedt32,
then press
Enter
.
3
Open the registry list to the following location:
\HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\adpu320
\Parameters\Device
If the Parameters\Device keys already exist, skip to
Step 8
below to begin entering values. If
the keys do not yet exist, you need to create them by continuing with
Step 4
.
4
Click the
adpu320
key.
5
Select the
Add Key
from the Edit menu; type
Parameters
in the Key Name edit box. Leave
the Class edit box blank.
6
Click the
Parameters
key.
Option Name
Default
Value
Valid
Value
Definition
/MAXTAGS=
nnn
32
1-255
Specifies tagged command queue depth per
target.
/INSTR_ERRLOG_Z=
nnn
32
0-127
Specifies the length of the instrumentation error
log.
MaximumSGList
65
2-255
Sets the maximum transfer size for an
individual command.
MaximumLogicalUnit
32
0-31
Limits the scan for connected devices on the
SCSI bus.
NumberOfRequests
255
16-255
Specifies the maximum number of commands
that can be delivered to an SCSI card.
