Symptom-to-FRU
index
The
Symptom-to-FRU
index
(see
Table
9)
lists
symptoms,
errors,
and
the
possible
causes.
The
most
likely
cause
is
listed
first.
The
PD
maps
found
in
the
IBM
TotalStorage
DS4000
Problem
Determination
Guide
provide
you
with
additional
diagnostic
aids.
Note:
1.
Always
start
with
the
“General
checkout”
on
page
4.
For
IBM
devices
not
supported
by
this
index,
see
the
manual
for
that
device.
2.
Do
not
look
directly
into
any
fiber
cable
or
GBIC
optical
output.
Read
“Notices”
on
page
137.
To
view
an
optical
signal,
use
a
mirror
to
view
the
reflected
light.
Table
9.
Symptom-to-FRU
index
for
Type
3523
fibre
channel
hub
and
GBIC
Problem
Action/FRU
GBIC
installed
in
one
or
more
ports
but
no
LED
is
lit.
1.
Power
cord
2.
Power
source
GBIC
installed
but
only
the
amber
LED
is
lit.
1.
Reseat
GBIC
2.
GBIC
GBIC
installed
and
both
green
and
amber
LEDs
are
lit.
The
hub
is
not
receiving
a
valid
fibre
channel
signal
from
the
end
node.
Perform
the
following
steps:
1.
Unplug
the
fiber
cable
from
the
node
and,
using
a
mirror,
verify
that
an
optical
signal
is
present
on
the
cable.
If
no
red
light
is
visible,
replace
the
cable.
2.
Using
a
mirror,
examine
the
SC
connectors
on
the
HBA
or
disk
controller.
If
no
red
light
is
visible,
check
the
HBA
or
disk
controller.
3.
If
a
light
is
present
on
both
the
cable
lead
and
the
end
node,
check
the
HBA
or
the
disk
controller.
GBIC
is
installed,
only
the
green
LED
is
lit,
but
no
communication
occurs
between
the
devices.
The
hub
is
receiving
a
valid
fibre
channel
signal
from
the
end
device,
but
no
upper-level
protocols
are
active.
Perform
the
following
steps:
1.
Verify
that
the
proper
HBA
device
drivers
are
loaded
for
the
appropriate
operating
system
and
that
the
host
has
been
configured
to
recognize
the
attached
disk
devices.
2.
Unplug
the
fiber
cable
from
the
end
node
and
verify
that
an
optical
signal
is
present
on
the
cable
lead.
If
no
signal
is
present,
the
lead
of
the
cable
might
be
defective.
Replace
the
cable.
8
IBM
TotalStorage
DS4000:
Hardware
Maintenance
Manual
Summary of Contents for System Storage DS4000
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