Oracle Sun Netra T5440, Service Manual, Page: 36 / 162

Running POST in Maximum Mode
36 Sun Netra T5440 Server • September 2015
1.5.2.1 Verifying Hardware Functionality
POST tests critical hardware components to verify functionality before the system boots and
accesses software. If POST detects an error, the faulty component is disabled automatically,
preventing faulty hardware from potentially harming software.
1.5.2.2 Diagnosing the System Hardware
You can use POST as an initial diagnostic tool for the system hardware. In this case, configure
POST to run in maximum mode (
diag_mode=service
,
setkeyswitch=diag
,
diag_level=max
)
for thorough test coverage and verbose output.
Running POST in Maximum Mode
This procedure describes how to run POST when you want maximum testing, as in the case
when you are troubleshooting a server or verifying a hardware upgrade or repair.
1.
Switch from the system console prompt to the
sc>
prompt by issuing the #.
escape sequence.
ok #.
sc>
2.
Set the virtual keyswitch to
diag
so that POST will run in service mode.
sc> setkeyswitch diag
3. Reset the system so that POST runs.
There are several ways to initiate a reset. Example 1-1 shows the
powercycle
command. For
other methods, refer to the Sun Netra T5440 Server Administration Guide .
4. Switch to the system console to view the POST output:
sc> console
Example 1-2 depicts abridged POST output.
5. Perform further investigation if needed.
■
If no faults were detected, the system will boot.
■
If POST detects a faulty device, the fault is displayed and the fault information is passed to
ALOM CMT CLI for fault handling. Faulty FRUs are identified in fault messages using the
FRU name.