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Table 3. QPI link LEDs (continued)
Link LEDs Number of nodes
QPI wrap card or cable
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:
v If a power failure occurs while the server is turned on, the server will restart
automatically when power is restored.
v The systems-management software can turn on the server remotely.
v If 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