IBM RS/6000 44P Series 270, Service Manual

Page: 193 / 346

System Power-On Methods
This section discusses the following system power-on methods:
v Power-on switch
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 one of the integrated serial ports.
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 and then hang
up. The default threshold is six rings.
Wait 5 minutes for the server to initialize and then call again using an ASCII terminal.
The server responds by requesting a password, if set, or presenting the service
processor menus. The remote user now has control of the server.
Note: For security, if the system is powered on by the remote power-on via ring
indicate signal and the service processor detects a battery failure, the service
processor causes the system to power off. See “Service Processor Call-In
Security” on page 176 for more information.
v Unattended start mode - refer to Enable/Disable Unattended Start Mode on page
159.
The service processor can be enabled to recover from the loss of ac power (see
Enable/Disable Unattended Power-On Mode in the SYSTEM POWER CONTROL
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.
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 occurring 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,
the server is not able to power on when ac power 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) Capabilities
Using the service processor menus, you can select the IPL type, mode, and speed of
your system. For more information, refer to “System Power Control Menu” on
page 159.
Attention : Selecting fast IPL results in several diagnostic tests being skipped, and a
shorter memory test being run.
Chapter 7. Using the Service Processor
175