Using the System Unit
2-9
Starting and Stopping the System Unit
Note: This section presents an overview of the procedures to follow when starting up and
shutting down the system. Before performing initial start up procedures, check with
the system administrator to determine if the system operating software has been
loaded and define the best startup and shut down procedures for the system. If the
system operating software must be loaded, refer to the
AIX Version 4 System
Management Guide: Operating System and Devices.
Methods of Starting the System Unit
The four methods of starting the system unit are as follows:
Manually
The power is switched on manually, and the
system unit does a normal or a service IPL
depending on the mode switch position. For further
explanation refer to page 2-10.
Remotely
The power is switched on from another location,
and the system unit does a normal IPL. To use this
method, a modem or an equivalent device must be
attached to the system.
Programmed by date and time
On a specific day and time, the power is switched
on and the system unit does a normal IPL. This
facility is available only with the system in stand-by
mode.
Recovery after a power failure
When the power is restored, the power is switched
on and the system unit does a normal IPL.
The examples used in this section describe a manual start up procedure. Refer to the
AIX Version 4 System Management Guide: Operating System and Devices, for more
information on all start up and shut down procedures. Also refer to “Chapter 3. Using
System Guard” and “Appendix G. System Power States” for additional start up and shut
down procedures.
When you press the power button, the power light comes on and the system starts its
power-on self-tests (POST). During the POST, messages warning that these tests are in
progress are displayed in the operator panel display. If an irrecoverable error occurs, its
error code is displayed in the operator panel display.
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