## Powering the System On and Off

By default, powering off the system results in a full shutdown. If the power relay is enabled, you have the option of performing a partial shutdown.

- In a partial shutdown, the Storage Service Processor shuts down the storage devices and continues to run, enabling you to restart the system from a remote console. Because the DSP is connected to switch outlets of the power sequencer, the Storage Service Processor can restore power to it. Then the MIC powers on the other cards in the DSP.
- In a full shutdown, the Storage Service Processor shuts down the storage devices, then gradually shuts down itself. You must restart the system manually.

You must be logged in as the admin user to power off the system. Before you power off the system, you must halt any I/O between the data hosts and the system.

Caution -

Failure to stop I/O before powering off can cause data loss.

### Related Topics

- Performing a Partial Shutdown
- Performing a Full Shutdown
- Restoring the System After a Full Shutdown