You can boot a machine in maintenance mode from a hard
disk.
Prerequisites
A bootable removable media
(tape or CD-ROM) must not be in the drive. Also, refer to the hardware
documentation for the specific instructions to enable maintenance
mode boot on your particular model.
Procedure
To boot a machine in maintenance
mode from a hard disk:
- To reboot, either turn the machine off and then power it
back on, or press the reset button.
- Press the key sequence for rebooting in maintenance mode
that is specified in your hardware documentation.
- The machine will boot to a point where it has a console
device configured.
If there is a system dump that needs
to be retrieved, the system dump menu will be displayed on the console.
Note:
- If the console fails to configure when there is a dump to be retrieved,
the system will hang. The system must be booted from a removable medium
to retrieve the dump.
- The system automatically dumps to the specified dump device when
the reset button is pressed. To change the primary or secondary dump
device designation in a running system, see the sysdumpdev command.
- If there is no system dump, or if it has been copied, the
diagnostic operating instructions will be displayed. Press Enter to
continue to the Function Selection menu.
- From the Function Selection menu,
you can select diagnostic or single-user mode:
Single-User
Mode: To perform maintenance in a single-user environment,
choose this option (option 5). The system continues to boot and enters
single-user mode. Maintenance that requires the system to be in a
standalone mode can be performed in this mode, and the bosboot command
can be run, if required.