IBM 88728AU Installation Guide - Page 86

Light, diagnostics

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Light path diagnostics Light path diagnostics is a system of LEDs on various external and internal components of the server. When an error occurs, LEDs are lit throughout the server. By viewing the LEDs in a particular order, you can often identify the source of the error. The server is designed so that LEDs remain lit when the server is connected to an ac power source but is not turned on, provided that the power supply is operating correctly. This feature helps you to isolate the problem when the operating system is shut down. Any PCI-X, memory, microprocessor, and VRM LED can be lit again without ac power after you remove the microprocessor tray so that you can isolate a problem. After ac power has been removed from the server, power remains available to these LEDs for up to 24 hours. To view the PCI-X, memory, microprocessor, and VRM LEDs, press and hold the light-path-diagnostics button on the PCI-X board, memory card, or microprocessor board for 30 seconds to light the error LEDs. The LEDs that were lit while the server was running will be lit again while the button is pressed. Many errors are first indicated by a lit information LED or system-error LED on the operator information panel on the front of the server. If one or both of these LEDs are lit, one or more LEDs elsewhere in the server might also be lit and can direct you to the source of the error. Before working inside the server to view light path diagnostics LEDs, read the safety information that begins on page v and "Handling static-sensitive devices" on page 8. If an error occurs, view the light path diagnostics LEDs in the following order: 1. Check the operator information panel on the front of the server. v If the information LED is lit, it indicates that information about a suboptimal condition in the server is available in the BMC log or in the system-error log. Important: If the server has a baseboard management controller, clear the BMC log and system-event log after you resolve all conditions. This will turn off the information LED and LOG LED, if all conditions are resolved. v If the system-error LED is lit, it indicates that an error has occurred; go to step 2 on page 75. The following illustration shows the operator information panel. Power-control button Information LED USB connector Release latch Power-on LED Hard disk drive activity LED Locator LED System-error LED 74 IBM System x3950 Type 8872 and System x3950 E Type 8874: Installation Guide

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Light
path
diagnostics
Light
path
diagnostics
is
a
system
of
LEDs
on
various
external
and
internal
components
of
the
server.
When
an
error
occurs,
LEDs
are
lit
throughout
the
server.
By
viewing
the
LEDs
in
a
particular
order,
you
can
often
identify
the
source
of
the
error.
The
server
is
designed
so
that
LEDs
remain
lit
when
the
server
is
connected
to
an
ac
power
source
but
is
not
turned
on,
provided
that
the
power
supply
is
operating
correctly.
This
feature
helps
you
to
isolate
the
problem
when
the
operating
system
is
shut
down.
Any
PCI-X,
memory,
microprocessor,
and
VRM
LED
can
be
lit
again
without
ac
power
after
you
remove
the
microprocessor
tray
so
that
you
can
isolate
a
problem.
After
ac
power
has
been
removed
from
the
server,
power
remains
available
to
these
LEDs
for
up
to
24
hours.
To
view
the
PCI-X,
memory,
microprocessor,
and
VRM
LEDs,
press
and
hold
the
light-path-diagnostics
button
on
the
PCI-X
board,
memory
card,
or
microprocessor
board
for
30
seconds
to
light
the
error
LEDs.
The
LEDs
that
were
lit
while
the
server
was
running
will
be
lit
again
while
the
button
is
pressed.
Many
errors
are
first
indicated
by
a
lit
information
LED
or
system-error
LED
on
the
operator
information
panel
on
the
front
of
the
server.
If
one
or
both
of
these
LEDs
are
lit,
one
or
more
LEDs
elsewhere
in
the
server
might
also
be
lit
and
can
direct
you
to
the
source
of
the
error.
Before
working
inside
the
server
to
view
light
path
diagnostics
LEDs,
read
the
safety
information
that
begins
on
page
v
and
“Handling
static-sensitive
devices”
on
page
8.
If
an
error
occurs,
view
the
light
path
diagnostics
LEDs
in
the
following
order:
1.
Check
the
operator
information
panel
on
the
front
of
the
server.
v
If
the
information
LED
is
lit,
it
indicates
that
information
about
a
suboptimal
condition
in
the
server
is
available
in
the
BMC
log
or
in
the
system-error
log.
Important:
If
the
server
has
a
baseboard
management
controller,
clear
the
BMC
log
and
system-event
log
after
you
resolve
all
conditions.
This
will
turn
off
the
information
LED
and
LOG
LED,
if
all
conditions
are
resolved.
v
If
the
system-error
LED
is
lit,
it
indicates
that
an
error
has
occurred;
go
to
step
2
on
page
75.
The
following
illustration
shows
the
operator
information
panel.
Power-control button
Power-on LED
USB connector
Hard disk drive activity LED
Information LED
System-error LED
Locator LED
Release latch
74
IBM
System
x3950
Type
8872
and
System
x3950
E
Type
8874:
Installation
Guide