Concurrent Mode; Maintenance Mode - IBM pSeries 630 6C4 Service Manual

Concurrent Mode

Running the online diagnostics in concurrent mode is started by entering diag at an AIX prompt. Use
concurrent mode to run online diagnostics on some of the system resources while the system is running
normal activity.
Because the system is running in normal operation, the following resources cannot be tested in concurrent
mode:
v SCSI adapters connected to paging devices
v Disk drive used for paging
v Some display adapters and graphics related devices
v Memory (tested during POST)
v Processor (tested during POST)
The following levels of testing exist in concurrent mode:
v The share-test level tests a resource while the resource is being shared by programs running in the
normal operation. This testing is mostly limited to normal commands that test for the presence of a
device or adapter.
v The sub-test level tests a portion of a resource while the remaining part of the resource is being used
in normal operation. For example, this test could test one port of a multiport device while the other ports
are being used in normal operation.
v The full-test level requires the device not be assigned to or used by any other operation. This level of
testing on a disk drive might require the use of the varyoff command. The diagnostics display menus to
allow you to vary off the needed resource.
Error-log analysis is done in concurrent mode when you select Problem Determination on the
DIAGNOSTIC MODE SELECTION menu.
To run the online diagnostics in concurrent mode, you must be logged in to the AIX operating system and
have proper authority to issue the commands (if help is needed, see the system operator).
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, do the following:
1. Log in to the AIX operating system as root user or use CE Login.
2. Enter the diag command.
3. When the DIAGNOSTIC OPERATING INSTRUCTIONS display, follow the instructions to check out the
desired resources.
4. When testing is complete, press the F3 key to return to the DIAGNOSTIC OPERATING
INSTRUCTIONS. Press the F3 key again to return to the AIX operating system prompt. Be sure to
vary on any resource that you had varied to off.
5. Press Ctrl-D to log off from root user or CE Login.

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 partition running the AIX operating system be stopped so that
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 Problem Determination on the
DIAGNOSTIC MODE SELECTION menu.
356 Eserver pSeries 630 Model 6C4 and Model 6E4 Service Guide