IBM 71453RU manual Server power features, Turning on the server

Table 3. QPI link LEDs (continued)

		QPI wrap card or cable
Link LEDs	Number of nodes	status
Off at failing port	1	Wrap card installed, not
		working
On	2	Cables installed, working
Off at failing port	2	Cables installed, not working

Power-on LED: See “Operator information panel” on page 14 for the various states of the power-on LED.

System-error LED: When this LED is lit, it indicates that a system error has occurred. An LED on the light path diagnostics panel is also lit to help isolate the error.

Locator LED: Use this LED to visually locate the server among other servers. You can use IBM Systems Director to light this LED remotely.

In a two-node configuration, this LED is lit on the primary server and flashes on the secondary server during POST.

You can press the Locator button on the operator information panel on the front of the server or use an IPMI command to turn this LED on or off.

Server power features

When the server is connected to an ac power source but is not turned on, the operating system does not run, and all core logic except for the integrated management module (IMM) is shut down; however, the server can respond to requests from the IMM, such as a remote request to turn on the server. The power-on LED flashes to indicate that the server is connected to ac power but not turned on.

In a two-node configuration, connect both servers to an ac power source as close to the same time as possible to ensure optimum operation.

Turning on the server

Approximately 30 seconds, or up to 8 minutes in a 2-node configuration, after the server is connected to ac power, the power-control button becomes active, and one or more fans might start running to provide cooling while the server is connected to power. You can turn on the server and all nodes in the partition and start the operating system by pressing the power-control button.

If you are restarting a two-node server after it has been turned off, you must allow extra time for the hardware to synchronize before you turn on the server again.

The server can also be turned on in any of the following ways:

vIf a power failure occurs while the server is turned on, the server will restart automatically when power is restored.

vThe systems-management software can turn on the server remotely.

vIf your operating system supports the Wake on LAN feature, the Wake on LAN feature can turn on the server.

Chapter 1. The System x3850 X5 and x3950 X5 server 19