HP-UX System Administrator's Guide: Routine Management Tasks

• When you need to boot your system into LVM Maintenance mode to correct a
problem with your computer’s logical volumes or volume groups.
• When you are installing, or updating to a new release of HP-UX.
Here is a detailed look at the boot process, and its variations.
CAUTION:
ACPI Configuration for HP-UX Must Be “default” on nPartitionable HP Integrity Servers
HP-UX will not boot on an nPartition-capable system if the ACPI configuration value
is not set to “DEFAULT”. A setting other than “DEFAULT” can exist, for example, if the
nPartition was previously running a non-HP-UX operating system that required a
different value.
To check the current ACPI configuration, at the EFI Shell interface enter the
acpiconfig command with no arguments. If the acpiconfig value is not set to
default, then HP-UX cannot boot; in this situation you must reconfigure acpiconfig
or else booting will be interrupted with a panic when launching the HP-UX kernel.
To set the ACPI configuration for HP-UX: in the EFI Shell interface enter the
acpiconfig default command, and then enter the reset command for the
nPartition to reboot with the proper (default) configuration for HP-UX.
A Standard Boot
Here are more details about what happens during a typical HP-UX boot-up sequence
on an HP Integrity Server.
1. Power on external devices: If necessary, turn on all external peripherals and
devices that are attached to your computer (for example, disk drives, tape drives,
printers, terminals, bus converters).
Once the devices have completed their self-check tests, proceed to the next step.
2. Power on your system (or nPartition): Turn on or reset the computer or nPartition.
System hardware (or hardware associated with an nPartition you are booting) will
go through a series of self-tests to verify that the processors, memory, and other
system components are in working order.
3. Boot device selection: Your system (or the nPartition you are booting) must
locate a kernel file to boot from. There are two parts to the search:
Part 1 determine the hardware path to the boot device
Part 2 determine which kernel file on the hardware path to boot (see Step 4)
Path variables stored in non-volatile memory set up to three possible boot paths
from which to attempt a boot:
PRI The PRImary boot path is the first boot path to try. Set the value of this path
to point to the device from which you will boot most often.
Booting Systems 39