IBM 7012 G Series, Руководство по обслуживанию

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Modifying SystemGuard Parameters
B-1
Appendix B. Modifying SystemGuard Parameters
Many SystemGuard parameters can be modified in several ways. Some can be modified
using the SystemGuard Stand-By menu, others using the SystemGuard Maintenance menu,
and others using the AIX diag or mpcfg commands or Diagnostic Service Aids. When you
want to modify SystemGuard parameters, the method to use depends on the machine boot
phase (stand-by, init, run-time). This chapter explains how to change some of the more
important flags and parameters depending on the current machine state. For a complete list
of default values for flags and parameters, see the table in “Default Parameter Values” on
page B-1.
The Mode Switch must be in the Service position to use the SystemGuard menus. If the
machine is in the stand-by phase, you must press the Enter key to get the SystemGuard
prompt, and then enter the keyword sbb to display the stand-by menu. If you enter the
power-on keyword (power), or if you turn the power on manually, the machine enters the init
phase and displays the maintenance menu if the
AutoService IPL flag is disabled. The
AutoService IPL flag is normally enabled. If the AutoService IPL flag is enabled, then the
flag must be disabled before the maintenance menu can be entered. The
AutoService IPL
flag can be disabled when the system is in stand-by phase by pressing the Enter key and
then entering the keyword sbb to display the
Stand-by Menu. Select the Set Flags option.
The
AutoService IPL flag can now be disabled. The AutoService IPL flag can also be
disabled using the Service Aids.
When changing parameters under the AIX operating system, the Diagnostic Service Aids
are recommended because its menu interface is better suited to interactive use. The mpcfg
command requires the use of command line flags and is better suited for shell scripts. The
command requires root authority. Also, the Service Aids require root authority if entered with
the diag command. They display or change flag values using
0
(zero) for disabled and
1
(one) for enabled. The explanations that follow refer to the Diagnostic Service Aids.
Default Parameter Values
The flags, parameters and keywords used by SystemGuard programs are stored in
non-volatile memory (NVRAM). They are given default values before leaving the factory, as
shown in the table on the following page.