System Power-On Methods - IBM H80 User Manual

System Power-On Methods

This section discusses the following system power-on methods:
v Power-on switch
v Service processor menus
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
26.
The service processor can be enabled to recover from the loss of ac power (see
Enable/Disable Unattended Power-On Mode in the System Control Power Menu).
When ac power is restored, the system returns to the power state at the time ac loss
occurred. For example, if the system was powered on when ac loss occurred, it
reboots/restarts when power is restored. If the system was powered-off when ac loss
occurred, it remains off when power is restored.
It is recommended that the CEC and I/O drawers both receive their ac power 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 loss is in progress when the timed power-on attempt occurs,
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:
shorter memory test being run.
the server is not able to power on when ac power is restored.
Selecting fast IPL results in several diagnostic tests being skipped and a
Chapter 3. Using the Service Processor
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