Chapter
6.
Hardware
maintenance
This
chapter
contains
information
to
help
you
solve
some
of
the
simpler
problems
that
you
might
have
with
your
storage
subsystem.
It
contains
the
problem
indicators
and
error
messages
along
with
suggested
actions
to
take
to
resolve
the
problem.
Note:
See
the
IBM
System
Storage
DS4000
Problem
Determination
Guide
for
additional
troubleshooting
and
debugging
procedures.
General
checkout
Use
the
status
LEDs,
Symptom-to-FRU
index,
and
the
DS4000
Storage
Manager
client
software
to
diagnose
problems.
See
To
diagnose
a
cluster
system,
use
the
cluster
problem
determination
procedure
in
the
IBM
System
Storage
DS4000
Problem
Determination
Guide
.
Note:
If
power
was
just
applied
to
the
storage
subsystem,
the
green
and
amber
LEDs
might
turn
on
and
off
intermittently.
Wait
up
to
five
minutes
for
the
storage
subsystem
to
finish
powering
up
before
you
begin
to
check
for
faults.
Using
the
diagnostic
hardware
The
DS4800
comes
with
an
LC
wrap-plug
adapter
and
LC-LC
coupler.
The
wrap-plug
adapter
and
LC-LC
coupler
are
used
to
perform
the
loopback
test
and
to
identify
fibre
path
problems.
See
the
IBM
System
Storage
DS4000
Problem
Determination
Guide
for
more
information.
The
loopback
test
and
the
sendEcho
test
are
described
in
the
IBM
System
Storage
DS4000
Problem
Determination
Guide
.
In
the
IBM
System
Storage
SAN
Integration
Server
configuration,
a
loopback
adapter
(P/N
17P6918)
is
included
to
identify
path
problems
on
the
drive
loop
when
using
fibre
channel
1.2
m
copper
cable
(P/N
18P5237).
Solving
problems
Always
use
the
DS4000
Storage
Manager
client
to
diagnose
storage
subsystem
problems
and
component
failures.
Also
to
find
solutions
to
problems
that
have
definite
symptoms.
You
can
use
the
symptom-to-FRU
index
as
a
guide
for
troubleshooting
problems
in
addition
to
the
DS4000
Storage
Manager
Recovery
Guru
in
the
Subsystem
Management
window.
Do
not
depend
solely
on
for
FRU
replacement
decision.
See
the
problem
determination
maps
in
the
IBM
System
Storage
DS4000
Problem
Determination
Guide
for
more
detailed
procedures
for
problem
isolation.
Attention:
Do
not
remove
any
power
supply
and
fan
units,
controllers,
or
interconnect-battery
units
from
the
storage
subsystem
unless
the
Service
Action
Allowed
LED
for
the
component
is
lit.
Always
use
the
appropriate
procedure
in
to
prevent
an
inadvertent
shutdown
of
the
DS4800
as
a
result
of
removing
the
DS4800
components
in
the
wrong
sequence.
©
Copyright
IBM
Corp.
2006,
2007
167
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