Isl Environment; Invoking Isl From The Boot Console Interface - HP Visualize J2240 Service Handbook

ISL Environment

The ISL environment provides the means to load the operating system (HP-UX) en-
vironment. The ISL environment also provides an offline platform to execute diag-
nostic and utility programs from a boot device when HP-UX does not load.
The ISL program is the first program loaded into main memory from an external
media (LAN, disk, or tape) and launched by the initial program loader (IPL) routine
from the Boot Administration environment.
The ISL environment provides the following capabilities:
D
Execute user-entered commands to modify boot device paths and boot options
in stable storage.
D
Run offline diagnostic programs and utilities.
D
Provide automatic booting of the HP-UX O/S after power-on or reset.

Invoking ISL from the Boot Console Interface

Perform the following steps to invoke ISL from the boot console interface:
1.
Follow the directions in "Accessing the Boot Console Interface" earlier in this
chapter, and then type the following at the prompt:
Main Menu: Enter a command or a menu >
You are prompted:
Interact with ISL (Y or N) >
2.
Answering yes (y) causes the ISL to be loaded from the specified device. After
a short time, the following prompt appears on your screen:
ISL>
ISL is the program that actually controls the loading of the operating system.
By interacting with ISL, you can choose to load an alternate version of the
HP-UX operating system.
For example, if the usual kernel (/stand/vmunix ) on your root disk
(fwscsi.6.0) has become corrupted, and you wish to boot your workstation from
the backup kernel (/stand/vmunix.prev), type the following at the
prompt:
hpux /stand/vmunix.prev
ISL>
9–18 Boot Console
boot <device>
y
Enter
Enter
Enter
ISL>