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

Booting from an Alternate Device
There are times when you will need to boot from a device other than the device that
you normally boot from. For example, if your primary boot disk fails, you might need
to boot your system either from a different disk or from a recovery tape.
Procedure 2-13 Using the Boot Console Handler to Boot from an Alternate Boot Device
1. After powering on or resetting your computer (or nPartition) take control of the
boot process by hitting any key on the console keyboard so that
autoboot/autosearch will not boot the system automatically (if they are
currently enabled). The Boot Console Handler will display its main menu.
The Boot Console Handler (BCH) will display its main menu and prompt for a
command:
Main Menu: Enter command >
Booting Systems 65