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sys_attrs(5)
NAME
  sys_attrs - introduction to kernel subsystem attributes used for
  configuration and tuning

DESCRIPTION
  The operating system kernel is built from many mandatory and optional
  subsystems. If you are logged into the root account, the following command
  lists the subsystems included in the kernel for your system:

       # /sbin/sysconfig -s

  The majority of the kernel subsystems have sets of attributes whose values
  control different aspects of subsystem configuration. You can examine the
  names, the current settings, and (if applicable) the minimum, and maximum
  settings of attributes for a particular subsystem by using the
  /sbin/sysconfig command. The -q option followed by the subsystem name
  displays attribute names and current settings. The -Q option followed by
  the subsystem name displays minimum and maximum settings and the kinds of
  operations permitted on the attribute (Configurable (at boot time),
  Reconfigurable (at run time), Query only). In the Common Desktop
  Environment (CDE), you can run the dxkerneltuner application to get the
  same information.

				    Caution

       A relatively small number of the attributes listed in displays from
       these interfaces should actually be changed through these same
       interfaces and then only as part of the system configuration and
       tuning tasks done by an experienced system or network administrator.
       The setting of most subsystem attributes should be done indirectly
       through system and network setup applications or be automatically
       adjusted by the kernel. This fact is very important to remember
       because attribute settings can have complex interrelationships with
       one another, requiring (in some cases) careful manipulation of an
       entire set of attributes rather than only one. Furthermore, default
       settings of some subsystem attributes should never be touched, except
       by support personnel or by an administrator acting on instructions
       from support personnel or patch kit documentation.

       Some attributes are modifiable at run time for ease of system tuning.
       Others are modifiable at run time only because of a software
       requirement and should not be changed manually. In general, do not
       change the default value of any system attribute manually unless the
       system documentation or your support representative provides
       directions for changing it.

  Some attributes have corresponding parameters in the system configuration
  file. If so, the corresponding parameter name in the system configuration
  file is specified in parentheses following the attribute name. In these
  cases, never edit the system configuration file to directly change the
  value of the system parameter; use the dxkerneltuner application or the
  /sbin/sysconfig -r command to change the value of the attribute. For some
  subsystems, these values are best applied through a stanza-formatted file
  that is specified as a parameter to the sysconfigdb command.

  See dxkerneltuner(8), sysconfig(8), and sysconfigdb(8) for more information
  about your options for configuring kernel subsystems.

  The following subsystems must be included when the kernel is built:

    ·  Configuration Manager (cm)

    ·  Generic Kernel (generic)

    ·  Interprocess Communication (ipc)

    ·  Process (proc)

    ·  Virtual File System (vfs)

    ·  Virtual Memory (vm)

  A kernel also includes a processor-specific subsystem whose name is an
  internal code for a particular processor. Processor-specific subsystems
  typically have no attributes, are not modified directly by users, and are
  not documented.

  Other kernel subsystems are technically optional, although a kernel almost
  always includes quite a few optional subsystems in order for a system to be
  useful. For information on the attributes for a particular subsystem, refer
  to the reference page for that subsystem. The names of these reference
  pages adhere to the format sys_attrs_subsystem-name. For example, to see
  the reference page that lists and describes attributes for the generic
  subsystem, you can type man sys_attrs_generic at the system command line.

  For guidelines on changing kernel subsystem attributes to improve system
  performance, see the System Configuration and Tuning manual. Any discussion
  about changing attributes for reasons other than tuning is located in the
  appropriate administration or program debugging manual.

  You can adjust some subsystem attribute values at run time. If so, the
  attribute descriptions mention that fact. To make it easy for you to locate
  these attributes when scanning lists, an asterisk (*) also precedes the
  names of these attributes.

SEE ALSO
  Commands: dxkerneltuner(8), sysconfig(8), sysconfigdb(8)

  Others: sys_attrs_cm(5), sys_attrs_generic(5), sys_attrs_ipc(5),
  sys_attrs_proc(5), sys_attrs_vfs(5), sys_attrs_vm(5)

  This list includes only reference pages for technically required
  subsystems.  The number of subsystems that can be configured in a kernel is
  very large, so all system attribute reference pages are not listed here.

  System Configuration and Tuning

  System Administration

  Network Administration

  Kernel Debugging

Index for Section 5

Alphabetical listing for S

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