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Running the online diagnostics in service mode
To run online diagnostics in service mode, perform the following steps:
1. Verify with the system administrator and users that all programs may be stopped, then do so. If the
system software is running, shut down the system as described in "Stopping the system" on page 310,
without removing power.
2. Wait until the power-on LED stops flashing and remains off, then press the power button to turn the
system on.
3. When the keyboard indicator appears during startup, press the numeric 6 key on the keyboard.
4. Enter any requested passwords.
After any requested passwords have been entered, the system attempts to boot from the first device of
each type found on the list. If no bootable image is found on the first device of each type on the list,
the system does not search through the other devices of that type for a bootable image; instead, it
polls the first device of the next type.
If all types of devices in the boot list have been polled without finding a bootable image, the system
restarts. This action gives the user the opportunity to start the System Management Services (by
pressing the number 1 key on a console) before the system attempts to boot again.
For more information, see Chapter 7, "Verifying the hardware operation", on page 243.
Concurrent mode
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 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 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.
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NAS Gateway 500 Service Guide
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