If the server operating system (OS) is running, you can use its shutdown procedure to power off the server to Standby power mode. The procedure provides a graceful shutdown of the server.
Refer to the OS documentation for instructions.
When the server is in Standby power mode, the SP indicator is on steady, and the System OK indicator blinks at the single blink rate (a quick flash every three seconds). See Troubleshooting Using Status Indicators.