Service Processor Reboot/Restart Recovery - IBM RS/6000 Enterprise Server M80 Service Manual

Privileged users can power on the system by selecting the System Control Power Menu option from
the main menu and then selecting the Power-on System option from the system power control menu.
General users should select Power-on System on the general user menu.
v Remote power-on via ring-indicate signal
The server automatically powers on when it detects a "ring-indicate" signal from a modem attached to
serial port 1 (S1) or serial port 2 (S2).
A remote user can call the server to activate ring detection by the modem. Listen for a few more rings
than the threshold number for starting the system. The system powers on without answering the call.
v Unattended start mode - refer to Enable/Disable Unattended Start Mode on page 368.
The service processor can be enabled to recover from the loss of ac power (dc power in a dc-powered
system) (see Enable/Disable Unattended Power-On Mode in the System Control Power Menu). When
ac power (dc power in a dc-powered system) is restored, the system returns to the power state at the
time ac loss (dc loss in a dc-powered system) occurred. For example, if the system was powered on
when ac loss (dc loss in a dc-powered system) occurred, it reboots/restarts when power is restored. If
the system was powered-off when ac loss (dc loss in a dc-powered system) occurred, it remains off
when power is restored.
It is recommended that the CEC and I/O drawers both receive their ac power (dc power in a
dc-powered system) from the same building circuit on the same circuit breaker, if not the same electrical
outlet box, in such a way that primary power cannot be lost to one unit separately from the other. If
such a condition occurs, unattended start mode may not be able to restart system operation when a
primary power interruption is restored.
v Timed power-on - refer to the shutdown -t command on servers using AIX.
Working in conjunction with AIX, the service processor in your server can operate a timer, much like the
wake-up timer on your clock radio. You can set the timer so that your server powers on at a certain time
after shutting down. The timer is battery-operated, so power interruptions that occur while the server is
off do not affect its accuracy. Refer to the AIX shutdown -t command for details on setting the timer.
Note: If an ac power (dc power in a dc-powered system) loss is in progress when the timed power-on
attempt occurs, the server is not able to power on when ac power (dc power in a dc-powered
system) is restored.
v Follow-up to a failed boot attempt
The service processor initiates a power-on sequence if a failed boot attempt is detected (due to a
hardware or software failure).
v Fast/slow boot (IPL) settings
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.
Chapter 8. Using the Service Processor
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