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##### POST Overview

POST is a group of PROM-based tests that run when the server is powered on or is reset. POST checks the basic integrity of the critical hardware components in the server (CMP, memory, and I/O subsystem).

You can also run POST as a system-level hardware diagnostic tool. Use the Oracle ILOM `set` command to set the parameter `keyswitch_state` to `diag`.

You can also set other Oracle ILOM properties to control various other aspects of POST 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. These properties are listed and described in Oracle ILOM Properties That Affect POST Behavior.

If POST detects a faulty component, the component is disabled automatically. If the system is able to run without the disabled component, the system boots when POST completes its tests. For example, if POST detects a faulty processor core, the core is disabled. Once POST completes its test sequence, the system boots and runs using the remaining cores.

##### Related Information

- Oracle ILOM Properties That Affect POST Behavior

- Configure POST

- Run POST With Maximum Testing

- Interpret POST Fault Messages

- Clear POST-Detected Faults

- POST Output Reference

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