IBM 7012 G Series, Service Manual

Page: 81 / 264

Using SystemGuard
2-51
10.At this point, a BOOT FROM SCSI DEVICE screen appears. This displays the PRESENT
DEVICE LOCATION CODE. If it is not the device you want to boot from, go through each
option and change it to the desired BUS, SLOT, SCSI ID, and LUN ID. Option 4 allows
you to change all these options at once. The BOOT FROM SCSI DEVICE screen is
similar to the following:
BOOT FROM SCSI DEVICE
PRESENT DEVICE LOCATION CODE:
(Drawer – Bus#/Slot# – Connector – SCSI ID/LUN) 000600600
COMMANDS: 0> CHANGE BUS#
1> CHANGE SLOT#
2> CHANGE SCSI ID
3> CHANGE LUN ID
4> CHANGE DEVICE LOCATION CODE
5> BOOT FROM SELECTED DEVICE
SELECT [x:exit]: 5
See page 2-26 for descriptions of these fields.
11. Enter
5
to begin the boot. The system leaves the maintenance environment and boots
from the specified SCSI device.
Booting from an SCSI Device through the Bootlist
The system can be booted from an SCSI device, such as a tape drive, without going through
the MAINTENANCE MENU. In this case, it uses the bootlist to determine the boot device
while in Service mode. The bootlist can be updated through Service Aids in Diagnostics.
Following are the prerequisites for booting from an SCSI device (a tape drive for example) in
Service mode:
•
The Autoservice IPL flag must be enabled.
•
The Service mode bootlist must be updated (this can be done in AIX Diagnostics by
selecting Service Aids and Display/Alter Bootlist).
•
A supported SCSI device, such as a tape drive.
•
A bootable SCSI media, such as a bootable tape (install or mksysb).
To boot off this SCSI device, do the following:
1. Switch the System Key to Service.
2. Insert the bootable media in the SCSI device.
3. Turn on the system power.
The system then boots up from this SCSI device. If the boot up is not successful, verify that
the tape is bootable, or clean the media device.