Dell Dimension 2200, Руководство пользователя

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3-12 Dell PowerEdge 2200 Systems User’s Guide
Bit Mask Options
Use this example to aid in calculating bit-mask option
hexadecimal values. Each SCSI device is enabled by a
“1” in its corresponding bit position. As illustrated in Fig-
ure 3-1, dev_enable=05 enables driver registration of the
devices at SCSI IDs 0 and 2.
Figure 3-1. Bit Position
Sample load Command
The following command is a sample load command with
no option switches (loaded from drive A):
load a:\scsi\aic7870.dsk
Slot values that already have another registered device do
not appear on the screen. Only the slots available for use
by the host adapter appear when this command is entered.
If an error message appears as you attempt to load the
driver, refer to “Troubleshooting for NetWare” found
later in this section.
The following command is a sample command loading
the aic7870.dsk driver with command line options
(loaded from drive A):
load a:\scsi\aic7870.dsk verbose=y slot=22
tag_disable
00-FF
* 00 Disables tagged queuing for specific targets. This disable bit mask
is entered in hexadecimal format. (See the following subsection,
“Bit Mask Options.”)
io_combine 0-255 16 Specifies the maximum number of segments in a scatter/gather list.
max_sectors 0-255 64 Specifies the maximum number of sectors in a single scatter/gather
segment.
max_tags 0-255 8 Specifies the maximum number of tagged commands.
max_nontags 0-255 2 Specifies the maximum number of nontagged commands.
read_after_write 0, 1, 2 2 Specifies the default verify mode: 0 = No verify on writes, 1 =
Software verify, 2 = Hardware verify.
instrumentation 0, 1 0 If 1 is entered, the instrumentation option is enabled. The driver
maintains internal instrumentation data for use by I/O manage-
ment applications. Instrumentation can also be enabled by the I/O
management application, so inclusion of this option is not neces-
sary.
Table 3-2.
load
Command Line Options (continued)
Option Values Default Description
* On the AIC-7880 and optional AHA-2940UW, these values become FFFF.
NOTE: For the full name of an abbreviation or acronym used in this table, see the Glossary.
15141312 111098 7654 3210
0 0 0 0 0 000 0000 0101
0 0 0 5
bit position
SCSI ID
0, 2
converted
binary-to-hex
= 05h