Solving
problems
Table
17.
Symptom-to-FRU
index
Problem
indicator
Component
Possible
cause
Possible
solutions
Amber
LED
is
lit
Drive
CRU
Drive
failure
Replace
failed
drive.
Fan
CRU
Fan
failure
Replace
failed
fan.
ESM
over-
temperature
LED
Subsystem
is
overheated
Check
fans
for
faults.
Replace
failed
fan
if
necessary.
Environment
is
too
hot
Check
the
ambient
temperature
around
the
storage
expansion
enclosure.
Cool
as
necessary.
Defective
LED
or
hardware
failure
If
you
cannot
detect
a
fan
failure
or
overheating
problem,
replace
the
ESM.
ESM
Fault
LED
ESM
failure
Replace
the
ESM.
See
your
controller
documentation
for
more
information.
ESM
Bypass
LED
No
incoming
signal
detected
Reconnect
the
SFP
modules
and
fibre
channel
cables.
Replace
input
and
output
SFP
modules
or
cables
as
necessary.
ESM
failure
If
the
ESM
Fault
LED
is
lit,
replace
the
ESM.
Front
panel
General
machine
fault
A
Fault
LED
is
lit
somewhere
on
the
storage
expansion
enclosure
(check
for
Amber
LEDs
on
CRUs).
SFP
transmit
fault
Check
that
the
CRUs
are
properly
installed.
If
none
of
the
amber
LEDs
are
lit
on
any
of
the
CRUs,
this
indicates
an
SFP
module
transmission
fault
in
the
storage
expansion
enclosure.
Replace
the
failed
SFP
module.
See
your
storage-manager
software
documentation
for
more
information.
Amber
LED
is
lit
and
green
LED
is
off
Power-supply
CRU
The
power
switch
is
turned
off
or
there
is
an
ac
power
failure
Turn
on
all
power-supply
switches.
Reseat
or
replace
power
supply.
Replace
the
power
cord.
Amber
and
green
LEDs
are
lit
Power-supply
CRU
Power-supply
failure
Replace
the
failed
power-supply
CRU.
78
IBM
TotalStorage
DS4000
EXP700
and
EXP710
Storage
Expansion
Enclosures:
Installation,
User’s,
and
Maintenance
Guide
Summary of Contents for TotalStorage DS4000 EXP710
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