Diagnostics and System Management Services 159
to the system using cfgmgr -i (or use SMIT -> Devices -> Install/Configure
Devices Added After IPL), specifying an installation device, then diagnostics
support for the device (if available) will be automatically installed. Running
on-line diagnostics provides you with access to the AIX error log and the AIX
configuration data, but again, the devices you can test are limited.
If the diagnostics package, bos.diag is installed on your system, you can
determine which devices in your system have diagnostic support loaded by
performing the following steps:
1. Enter diag.
2. Press Enter on the main screen, and then select Task Selection.
3. Select Display Configuration and Resource List.
If a device installed in your system is not listed, refer to your installation
media to see if the device comes with a diagnostics support fileset.
On-line Diagnostics can be run in the following three modes:
• Service Mode allows checking of most system resources.
• Concurrent Mode allows the normal system functions to continue while
selected resources are being checked.
• Single-User Mode allows checking of most system resources.
These three modes are discussed in the following sections.
6.3.1 Service Mode
Running diagnostics in service mode provides the most thorough test of the
system resources available with On-line Diagnostics. As in the concurrent
mode, however, there are resources that cannot be tested. These resources
are the SCSI adapter and disks used for paging. You can also analyze the
error log in this mode by selecting the Problem Determination option on the
Diagnostic Routine Selection menu.
To access diagnostics from Service mode, perform the following steps:
1. Stop all programs including the AIX operating system (shutdown -F).
2. Remove all tapes, diskettes and CD-ROM discs.
3. Turn the system unit’s power off and wait for at least 30 seconds.
4. Turn the system unit’s power on again.
5. After the first POST indicator appears on the system unit’s console, press
F6 on the directly attached keyboard, or the number 6 key on the ASCII