Light
path
diagnostics
Light
path
diagnostics
is
a
system
of
LEDs
on
the
control
panel
and
on
various
internal
components
of
the
blade
server.
When
an
error
occurs,
LEDs
can
be
lit
throughout
the
blade
server
to
help
identify
the
source
of
the
error.
After
you
remove
the
blade
server,
you
can
press
and
hold
the
light
path
diagnostics
switch
for
a
maximum
of
25
seconds
to
light
the
LEDs
and
locate
the
failing
component.
The
following
components
have
this
feature:
v
Hard
disk
drives
v
Light
path
diagnostics
panel
v
Microprocessors
v
Memory
modules
(DIMMs)
Viewing
the
light
path
diagnostics
LEDs
Before
working
inside
the
blade
server
to
view
light
path
diagnostics
LEDs,
read
the
safety
information
that
begins
on
page
vii
and
“Handling
static-sensitive
devices”
on
page
56.
If
an
error
occurs,
view
the
light
path
diagnostics
LEDs
in
the
following
order:
1.
Look
at
the
control
panel
on
the
front
of
the
blade
server
(see
“Blade
server
controls,
LEDs,
and
connectors”
on
page
4).
v
If
the
information
LED
is
lit,
it
indicates
that
information
about
a
suboptimal
condition
in
the
blade
server
is
available
in
the
BMC
log
or
in
the
management-module
event
log.
v
If
the
blade-error
LED
is
lit,
it
indicates
that
an
error
has
occurred;
go
to
step
2.
2.
To
view
the
light
path
diagnostics
panel
and
LEDs,
complete
the
following
steps:
a.
Remove
the
blade
server
from
the
BladeCenter
unit.
b.
Place
the
blade
server
on
a
flat,
static-protective
surface.
c.
Remove
the
cover
from
the
blade
server.
d.
Press
and
hold
the
light
path
diagnostics
switch
to
light
the
LEDs
of
the
failing
components
in
the
blade
server.
The
LEDs
will
remain
lit
for
as
long
as
you
press
the
switch,
to
a
maximum
of
25
seconds.
38
BladeCenter
HS20
Type
7981
and
1884:
Problem
Determination
and
Service
Guide
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