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Chapter 2 Sun Fire T1000 Server Diagnostics 31
Reasons to Run POST
You can use POST for basic sanity checking of the server hardware and for
troubleshooting as described in the following sections.
Routine Sanity Check of the Hardware
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 impacting system
operation.
Under normal operating conditions, the server is usually configured to run POST
maximum mode for all power-on or error-generated resets. This enables the system
to initialize quickly, and still have hardware checkups to ensure a healthy system.
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 diagnostic service mode for maximum test coverage and
verbose output.
▼ To Run POST
This procedure describes how to run POST when you want maximum testing, as in
the case when you are troubleshooting a system.
1. Switch from the system console prompt to the SC console prompt by issuing the #.
escape sequence and type the command setsc diag_mode normal.
2. Set the virtual keyswitch to diag so that POST will run in service mode.
ok #.
sc> setsc diag_mode normal
sc> setkeyswitch diag