IBM X3950 X5 Problem Determination And Service Manual page 34

A thumbscrew is in this position only
when a 2-node lock bracket is installed
(2-node Scalability Kit Option)
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.
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.
Error LED: When the power-supply error LED is lit, it indicates a problem with
the power supply.
QPI Link LEDs 1 - 4: When the QuickPath Interconnect (QPI) link LEDs are lit,
they indicate that the QPI links are fully established.
Table 4. QPI link LEDs
Link LEDs
Off
On
Off at failing port
Off
On
Off at failing port
18
IBM System x3850 X5 and x3950 X5 Types 7145, 7146, 7143, and 7191: Problem Determination and Service Guide
QPI QPI
Link 1 Link 2
LED LED
Power on
LED
System
error LED
Number of Nodes
1
1
1
1 with four microprocessors
2
2
AC power LED
(green)
AC
DC power LED
(green)
DC
Error LED
(amber)
!
AC
AC AC
DC
DC DC
!
! !
QPI QPI
Link 3 Link 4
LED LED
Locator
LED
QPI wrap card or cable status
None installed
Wrap card installed, working
Wrap card installed, not working
None installed
Cables installed, working
Cables installed, not working