IBM pSeries 670, Service Manual

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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 reinitialized. 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 might otherwise be unreported.
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 reinitiate the
boot process (reboot) if enabled to do so. The service processor can re-attempt this process according to
the number of retries selected 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 . 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.
Use OS-Defined restart policy - The default setting is no. If set to yes on a full system partition, this
causes the service processor to refer to the OS Automatic Restart Policy setting and take action (the same
action the operating system would take if it could have responded to the problem causing the restart).
When this setting is no, or if the operating system did not set a policy, the service processor refers to
enable supplemental restart policy for its action.
This setting is ignored on a partitioned system.
Enable supplemental restart policy - The default setting is yes. When set to yes on a full system
partition, the service processor restarts the server when the operating system loses control and either:
The Use OS-Defined restart policy is set to No.
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pSeries 670 Service Guide