Programming instructions

50 Chapter 3
Troubleshooting
Dealing with a Boot Failure
Dealing with a Boot Failure
To start this workstation from an operating system stored on a device different from the
usual boot device, to boot from a different disk, or to boot from another type of device (such
as an alternate hard disk or CD), see the following situations and examples that use the
Boot Console Handler. To access the Boot Console Handler, see Chapter 6.
• To boot from a known device containing a bootable operating system, type the following
at the prompt and press
Enter
:
Main Menu: Enter a command or a menu > boot
device
where
device
is the hardware path to the device, specified in Mnemonic Style Notation
For example, to boot an operating system stored on a DDS-format tape in a drive
located at “
scsi.1.0
,” go to the Main Menu of the Boot Console Interface and then type
the following command at the prompt and press
Enter
:
Main Menu: Enter a command > boot scsi.1.0
The operating system on the specified device is used to start the workstation.
• To interact with the Initial System Loader (ISL) before booting the workstation, type
the following at the prompt and press
Enter
:
Main Menu: Enter a command or a menu > boot
device
You are prompted:
Interact with ISL (Y or N) > y
Answering yes (
y
) causes the ISL to be loaded from the specified device. After a short
time, the following prompt appears on the 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
for HP-UX 10.20) on the root disk
(
scsi.6.0
) has become corrupted, boot the workstation from the backup kernel
(
/stand/vmunix.prev
for HP-UX 10.20) by typing the following at the
ISL>
prompt
and press
Enter
:
ISL> hpux /stand/vmunix.prev
• To find the location of the bootable operating systems on the various media in the file
system, use the
search ipl
command.