Running Post; Controlling How Post Runs - Oracle Sun Netra T5440 Service Manual

1.5 Running POST
Commands:
1.5

Running POST

Power-on self-test (POST) is a group of PROM-based tests that run when the server is powered
on or reset. POST checks the basic integrity of the critical hardware components in the server
(CPU, memory, and I/O buses).
If POST detects a faulty component, the component is disabled automatically, preventing faulty
hardware from potentially harming any software. If the system is capable of running without the
disabled component, the system will boot when POST is complete. For example, if one of the
processor cores is deemed faulty by POST, the core will be disabled, and the system will boot
and run using the remaining cores.
1.5.1

Controlling How POST Runs

The server can be configured for normal, extensive, or no POST execution. You can also
control the level of tests that run, the amount of POST output that is displayed, and which reset
events trigger POST by using ALOM CMT CLI variables.
Table 1-7
the variables work together.
Note -
setkeyswitch.
TABLE 1-7
Parameter
setkeyswitch
diag_mode
32 Sun Netra T5440 Server • September 2015
clear_fault_action = (none)
cd
show
lists the ALOM CMT CLI variables used to configure POST.
Use the ALOM CMT CLI setsc command to set all the parameters in
ALOM CMT CLI Parameters Used for POST Configuration
Values
normal
diag
stby
locked
off
normal
Description
The system can power on and run POST (based on the other
parameter settings). For details see
overrides all other commands.
The system runs POST based on predetermined settings.
The system cannot power on.
The system can power on and run POST, but no flash updates
can be made.
POST does not run.
Runs POST according to diag_level value.
Figure 1-8 shows how
Table 1-7 except
Figure 1-8. This parameter