Power-on self-test (POST) is a group of PROM-based tests that run when the server is powered on or when it is reset. POST checks the basic integrity of the critical hardware components in the server (CMP, memory, and I/O subsystem).
If POST detects a faulty component, the component is disabled automatically. If the system is able to run without the disabled component, it will boot when POST completes its tests. For example, if POST detects a faulty processor core, the core will be disabled and, once POST completes its test sequence, the system will boot and run using the remaining cores.
You can control various aspects of how POST performs its operations. For example, you can specify the events that cause POST to run, the level of testing POST performs, and the amount of diagnostic information POST displays. You use the ILOM set command to control the state of the applicable ILOM properties. These properties are listed and described in ILOM Properties that Affect POST Behavior.