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The diag command loads the diagnostic controller and displays the Online diagnostic
menus.
Running the Online Diagnostics in Concurrent Mode
To run Online diagnostics in concurrent mode, take the following steps:
Log on to the AIX operating system as root or superuser.
Enter the diag command.
When the DIAGNOSTIC OPERATING INSTRUCTIONS are displayed, follow the
instructions to check out the desired resources.
When testing is complete; use the F3 key to return to the DIAGNOSTIC OPERATING
INSTRUCTIONS. Then press the F3 key again to return to the AIX operating system
prompt. Be sure to vary on any resource you had varied to off.
Press the Ctrl–D key sequence to log off from root or superuser.
Maintenance Mode
Maintenance mode runs the Online diagnostics using the customer's version of the AIX
operating system. This mode requires that all activity on the AIX operating system be
stopped so the Online diagnostics have most of the resources available to check. All of the
system resources except the SCSI adapters, memory, processor, and the disk drive used
for paging can be checked.
Error log analysis is done in maintenance mode when you select the Problem Determination
option on the DIAGNOSTIC MODE SELECTION menu.
The shutdown –m command is used to stop all activity on the AIX operating system and
put the AIX operating system into maintenance mode. Then the diag command is used to
invoke the diagnostic controller so you can run the diagnostics. After the diagnostic
controller is loaded, follow the normal diagnostic instructions.
Running the Online Diagnostics in Maintenance Mode
To run the Online diagnostics in maintenance mode you must be logged on to the
customer's version of the AIX operating system as root or superuser and use the
shutdown –m and diag: commands. Use the following steps to run the Online diagnostics
in maintenance mode:
1. Stop all programs except the AIX operating system (get help if needed).
2. Log onto the AIX operating system as root or superuser .
3. Enter the shutdown –m command.
4. When a message indicates the system is in maintenance mode, enter the diag
command.
Note: It may be necessary to set TERM type again.
5. When DIAGNOSTIC OPERATING INSTRUCTIONS is displayed, follow the displayed
instructions to checkout the desired resources.
6. When testing is complete; use the F3 key to return to DIAGNOSTIC OPERATING
INSTRUCTIONS. Then press the F3 key again to return to the AIX operating system
prompt.
7. Press Ctrl–D to log off from root or superuser .
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Operator Guide
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