IBM 71453RU manual QPI wrap card or cable, Link LEDs Number of nodes Status

AC

DC

!

A thumbscrew is in this position only when a 2-node lock bracket is installed (2-node Scalability Kit Option)

AC power LED (green)

DC power LED (green)

Error LED (amber)

AC	AC
AC
DC	DC
DC
!!	!

QPI	QPI	QPI	QPI
Link 1	Link 2	Link 3	Link 4
LED	LED	LED	LED

Power on

LED

System	Locator
error LED	LED

AC power LED: Each hot-swap power supply has an ac power LED and a dc power LED. When the ac power LED is lit, it indicates that sufficient power is coming into the power supply through the power cord. During typical operation, both the ac and dc power LEDs are lit. For any other combination of LEDs, see the Problem Determination and Service Guide.

DC power LED: Each hot-swap power supply has a dc power LED and an ac power LED. When the dc power LED is lit, it indicates that the power supply is supplying sufficient dc power to the system. During typical operation, both the ac and dc power LEDs are lit. For any other combination of LEDs, see the Problem Determination and Service Guide.

Error LED: When the power-supply error LED is lit, it indicates that the power supply has failed. See the Problem Determination and Service Guide for detailed information about power-supply errors.

QPI link LEDs 1 - 4: When the QuickPath Interconnect (QPI) link LEDs are lit, they indicate that the QPI links are fully established.

Table 3. QPI link LEDs

		QPI wrap card or cable
Link LEDs	Number of nodes	status
Off	1	None installed
On	1	Wrap card installed, working

18IBM System x3850 X5 and x3950 X5 Types 7145, 7146, 7143, and 7191: Installation and User's Guide