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 system 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 re-initiate the
boot process (reboot) if enabled to do so. The service processor can reattempt 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” on page 259). If OS activity stops due to a hardware- or software-induced
failure, the service processor can initiate a reboot or 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).
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 the operating system to reboot or 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 the automatic restart policy 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. This causes the service processor to refer to
the OS Automatic Restart Policy setting and take action (the same action that 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 the
Enable Supplemental Restart Policy for its action.
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NAS Gateway 500 Service Guide
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