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Note: Pressing the F3 key (from a defined terminal) produces a "Confirm Exit"
popup menu which offers two options: continuing with the shutdown by
pressing F3; or returning to diagnostics by pressing Enter.
For undefined terminals, pressing 99 produces a full screen menu which
offers two options: continuing with the shutdown by pressing 99 and then
Enter; or returning to diagnostics by pressing Enter.
Concurrent Mode
Concurrent mode provides a way to run Online 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
Memory
Processor
There are three levels of testing in concurrent mode:
The share-test level tests a resource while the resource is being shared by pro-
grams 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 opera-
tion.
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.
Error log analysis is done in concurrent mode when you select the Problem Determi-
nation option on the DIAGNOSTIC MODE SELECTION menu.
To run the Online 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).
6-10 RS/6000 Enterprise Server Model H Series User's Guide