sysconfigtab(4)sysconfigtab(4)NAMEsysconfigtab - Configurable subsystem definition database file
SYNOPSIS
/etc/sysconfigtab
DESCRIPTION
The sysconfigtab file contains initial values for the attributes of
subsystems that can be dynamically configured. The information in the
sysconfigtab file is loaded into an in-memory kernel database when the
system boots. At subsystem configuration time, values in the in-memory
kernel database override default values coded into the subsystem.
There are multiple numbered versions of the sysconfigtab.* file in the
/etc directory, but only the /etc/sysconfigtab version is used during
normal operations. The versions are present to support the dynamic
linking of modules to create a /vmunix kernel. This feature is called
bootlinking and is documented in Guide to Preparing Product Kits. You
may not be able to use bootlinking if you delete any copies of the
sysconfigtab.* file.
Avoid making manual changes to this file. Instead, use the command
sysconfigdb(8) to make changes. This utility will automatically make
any changes available to the kernel and will preserve the structure of
the file so that future upgrades will merge in correctly.
The sysconfigtab file consists of formatted entries. The first line in
an entry specifies the subsystem name. Subsequent lines specify the
subsystems' attributes and values. Comment lines are allowed within an
entry. The following shows the syntax of a subsystem entry: subsys‐
tem-name: #This is a comment describing the subsystem
attribute1 = value1
attribute2 = value2, value3
The following list details sysconfigtab entries: The subsystem name is
terminated with a colon (:). Each attribute name and value pair are
terminated with a newline character. Attribute names are separated
from values with an equal sign (=). No space is allowed in the middle
of an attribute name, including an array attribute name. For instance,
array attribute names such as attr1[1] and attr1[2] are permitted, but
attr1 [1] or attr1[ 2 ] are not. For example, the following line in
/etc/sysconfigtab is permitted:
attr1[0] = 2 Attributes that have more than one value separate
the values with a comma (,). Quotation marks are not used (")
in string values. Blank or tab characters may occur in the mid‐
dle of a string, but leading or trailing blanks are ignored. A
number sign (#) appears at the beginning of comment lines.
Comments that are specific to the subsystem are placed after the
line containing the subsystem name. The sysconfigdb command
considers a sysconfigtab entry to begin with the subsystem name
and end with either the next subsystem name or the end of the
file. Any comments that appear before a subsystem name are con‐
sidered to be part of the preceding subsystem and are deleted if
the preceding subsystem is deleted.
For a list of the subsystem attributes you can configure, see the Sys‐
tem Administration manual. Refer also to the various sys_attrs refer‐
ence pages, which list the system attributes and their default or maxi‐
mum values. The graphical user interface dxkerneltuner provides you
with an easy way to review and adjust attribute values.
For information about loadable device driver attributes, see the Writ‐
ing Device Drivers: Tutorial manual.
In a cluster environment, an additional clusterwide file, syscon‐
figtab.cluster, is used to contain those attributes that must be set to
the same values in each member's /etc/sysconfigtab file. When a clus‐
ter member boots, the contents of its /etc/sysconfigtab file is syn‐
chronized against the clusterwide sysconfigtab.cluster file.
RESTRICTIONS
The maximum length of a stanza entry is 40960 bytes. An entry cannot
contain more than 2048 fields (lines).
The maximum length of a stanza field is 500 bytes.
EXAMPLES
The following shows an example stanza entry that could appear in the
configurable subsystem database:
proc:
max-proc-per-user = 64
max-threads-per-user = 256
The preceding entry defines the max-proc-per-user and max-threads-per-
user attributes for the proc subsystem.
SEE ALSO
Commands: dxkerneltuner(8), sys_attrs(5), sysconfig(8), sysconfigdb(8),
cfgmgr(8)
Files: stanza(4)
System Administration
Writing Device Drivers: Tutorial
sysconfigtab(4)
