Table 3-2. load Command Line Options (continued)

Option

Values

Default

Description

 

 

 

 

dev_enable=

00-FF*

FF

Allows you to enable the driver’s registration of SCSI

 

 

 

devices on a per-target basis. This enable bit mask is

 

 

 

entered in hexadecimal format. (See the following

 

 

 

subsection, “Bit Mask Options.”)

 

 

 

 

lun_enable=

00-FF*

01

Enables scanning for specific LUNs on all targets. (See

 

 

 

the following subsection, “Bit Mask Options,” for details

 

 

 

on creating bit masks.) For example, a value of 7 causes

 

 

 

the driver to scan for LUNs 0, 1, and 2 on all targets. The

 

 

 

default value of 01 causes the driver to scan LUN 0 only.

 

 

 

 

tag_disable

0-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 management applications. Instrumentation can also be

 

 

 

enabled by the I/O management application, so inclusion

 

 

 

of this option is not necessary.

*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.

3-34 Dell PowerEdge 2100/180 and 2100/200 Systems User’s Guide

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Dell 2100/180, 2100/200 Devenable=, Lunenable=, Tagdisable, Iocombine, Maxsectors, Maxtags, Maxnontags, Readafterwrite

2100/180, 2100/200 specifications

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