Concurrent Mode - IBM R30 Operator's Manual

Concurrent Mode

Concurrent mode provides a way to run diagnostics on some of the system resources while
the system is running normal system activity.
Because the system is running in normal operation, some of the resources cannot be tested
in concurrent mode. The following resources cannot be tested in concurrent mode:
SCSI adapters connected to paging devices
The disk drive used for paging
Some display adapters.
There are three levels of testing in concurrent mode:
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.
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.
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 may require the use of the varyoff
command. The diagnostics display menus to allow you to vary off the needed
resource.
The diagnostics also display a menu to assign a resource if another resource is needed.
Error log analysis is done in concurrent mode when you select the Problem Determination
option on the DIAGNOSTIC MODE SELECTION menu.
To run the diagnostics in concurrent mode you must be logged onto the AIX operating
system and have proper authority to issue the commands (if needed, get help).
The diag command loads the diagnostic controller and displays the diagnostic menus.
Running the Diagnostics in Concurrent Mode
To run diagnostics in concurrent mode, take the following steps:
1. Log on to the AIX operating system as root or superuser.
2. Enter the diag command.
3. When the DIAGNOSTIC OPERATING INSTRUCTIONS are displayed, follow the
instructions to check out the desired resources.
4. 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 disk drives you had varied to off.
5. Press the Ctrl-D key sequence to log off from root or superuser.
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Operator Guide