IBM 6H0, Service Manual

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Using the service processor menus, you can select the IPL type, mode, and speed of
your system boot.
Attention: Selecting fast IPL results in several diagnostic tests being skipped and a
shorter memory test being run.
Service Processor Reboot/Restart Recovery
Reboot describes bringing the system hardware back up; for example, from a system
reset or power-on. The boot process ends when control passes to the operating system
process.
Restart describes activating the operating system after the system hardware is
re-initialized. Restart must follow a successful reboot.
Boot (IPL) Speed
When the server enters reboot recovery, slow IPL is automatically started, which gives
the POST an opportunity to locate and report any problems that may otherwise be
undetected.
Failure During Boot Process
During the boot process, either initially after system power-on or upon reboot after a
system failure, the service processor monitors the boot progress. If progress stops, the
service processor can re-initiate the boot process (reboot) if enabled to do so. The
service processor can re-attempt this process according to the number of retries that
has been set in the Reboot/Restart Policy Setup Menu.
Failure During Normal System Operation
When the boot process completes and control transfers to the operating system (OS),
the service processor can monitor operating system activity (see the Set Surveillance
Parameters option in the Service Processor Setup Menu). If OS activity stops due to a
hardware- or software-induced failure, the service processor can initiate a reboot/restart
process based on the settings in the Service Processor Reboot/Restart Policy Setup
Menu and the OS automatic restart settings (see the operating system documentation).
If you are using the AIX operating system, the menu item under SMIT for setting the
restart policy is Automatically Reboot After Crash (True/False). The default is false.
When the setting is true, and if the service processor parameter
″
Use OS-Defined
Restart Policy
″
is yes (the default), the service processor takes over for AIX to
reboot/restart after a hardware or surveillance failure.
Service Processor Reboot/Restart Policy Controls
The operating system’s automatic restart policy (see operating system documentation)
indicates the operating system response to a system crash. The service processor can
be instructed to refer to that policy by the Use OS-Defined Restart Policy setup menu.
If the operating system has no automatic restart policy, or if it is disabled, then the
service processor restart policy can be controlled from the service processor menus.
Use the Enable Supplemental Restart Policy selection.
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Service Guide