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##### PSH Overview

PSH enables the server to diagnose problems while the Oracle Solaris OS is running and mitigate many problems before they negatively affect operations.

The Oracle Solaris OS uses the fault manager daemon, `fmd`(1M), which starts at boot time and runs in the background to monitor the system. If a component generates an error, the daemon correlates the error with data from previous errors and other relevant information to diagnose the problem. Once diagnosed, the fault manager daemon assigns a Universal Unique Identifier (UUID) to the error. This value distinguishes this error across any set of systems.

When possible, the fault manager daemon initiates steps to self-heal the failed component and takes the component offline. The daemon also logs the fault to the syslogd daemon and provides a fault notification with a MSG-ID. You can use the MSG-ID to get additional information about the problem from the knowledge article database.

The PSH technology covers the following server components:

- CPU

- Memory

- I/O subsystem

The PSH console message provides the following information about each detected fault:

- Type

- Severity

- Description

- Automated response

- Impact

- Suggested action for a system administrator

If PSH detects a faulty component, use the `fmadm faulty` command to display information about the fault. Alternatively, you can use the Oracle ILOM command show faulty for the same purpose.

##### Related Information

- PSH-Detected Fault Example (`show` `faulty` Command)

- Check for PSH-Detected Faults

- Clear PSH-Detected Faults

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