HP Visualize c100 Service Handbook page 85

Chap4.doc 62 Fri Sep 15 14:08:14 1995
Troubleshooting
Dealing with a Boot Failure
ISL Environment
The ISL environment provides the means to load the
operating system (HP-UX) environment. The ISL
environment also provides an offline platform to exe-
cute diagnostic 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) rou-
tine during the Boot Administration environment.
The ISL environment provides the following capabili-
ties:
• Execute user-entered commands to modify boot device
paths and boot options in stable storage.
• Run offline diagnostic programs (TDIAG, IOMAP).
• Provide automatic booting of the HP-UX O/S after
power-on or reset.
The ISL program provides a standalone environment
for loading offline diagnostic and utility programs
from the LIF directory. The ISL program also provides
user commands to configure the boot parameters into
Stable Storage.
62