IBM 8676 Hardware Maintenance Manual - Page 100

CRU/FRU

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Page 100 highlights

Note: See "System" on page 112 to determine which components should be replaced by a field service technician. Expansion enclosure problems Symptom FRU/action The SCSI expansion enclosure used to work but does not work now. 1. Verify that: v The cables for all external SCSI options are connected correctly. v The last option in each SCSI chain, or the end of the SCSI cable, is terminated correctly. v Any external SCSI option is turned on. You must turn on an external SCSI option before turning on the server. 2. For more information, see your SCSI expansion enclosure documentation. Note: See "System" on page 112 to determine which components should be replaced by a field service technician. Hark disk drive problems Symptom FRU/action Not all drives are recognized by 1. Remove the first drive not recognized and try the hard disk drive the hard disk drive diagnostic diagnostic test again. test (Fixed Disk test). 2. If the remaining drives are recognized, replace the drive you removed with a new one. System stops responding during 1. Remove the hard disk drive being tested when the server stopped hard disk drive diagnostic test. responding and try the diagnostic test again. 2. If the hard disk drive diagnostic test runs successfully, replace the drive you removed with a new one. Note: See "System" on page 112 to determine which components should be replaced by a field service technician. General problems Symptom FRU/action Problems such as broken cover v Broken CRU/FRU locks or indicator LEDs not working Note: See "System" on page 112 to determine which components should be replaced by a field service technician. Intermittent problems Symptom FRU/action A problem occurs only occasionally and is difficult to detect. 1. Verify that: v All cables and cords are connected securely to the rear of the server and attached options. v When the server is turned on, air is flowing from the rear of the server at the fan grill. If there is no airflow, the fan is not working. This causes the server to overheat and shut down. v Ensure that the SCSI bus and devices are configured correctly and that the last external device in each SCSI chain is terminated correctly. 2. Check the system error log. 90 xSeries 335 Type 8676, Type 8830: Hardware Maintenance Manual and Troubleshooting Guide

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Note:
See
“System”
on
page
112
to
determine
which
components
should
be
replaced
by
a
field
service
technician.
Expansion
enclosure
problems
Symptom
FRU/action
The
SCSI
expansion
enclosure
used
to
work
but
does
not
work
now.
1.
Verify
that:
v
The
cables
for
all
external
SCSI
options
are
connected
correctly.
v
The
last
option
in
each
SCSI
chain,
or
the
end
of
the
SCSI
cable,
is
terminated
correctly.
v
Any
external
SCSI
option
is
turned
on.
You
must
turn
on
an
external
SCSI
option
before
turning
on
the
server.
2.
For
more
information,
see
your
SCSI
expansion
enclosure
documentation.
Note:
See
“System”
on
page
112
to
determine
which
components
should
be
replaced
by
a
field
service
technician.
Hark
disk
drive
problems
Symptom
FRU/action
Not
all
drives
are
recognized
by
the
hard
disk
drive
diagnostic
test
(Fixed
Disk
test).
1.
Remove
the
first
drive
not
recognized
and
try
the
hard
disk
drive
diagnostic
test
again.
2.
If
the
remaining
drives
are
recognized,
replace
the
drive
you
removed
with
a
new
one.
System
stops
responding
during
hard
disk
drive
diagnostic
test.
1.
Remove
the
hard
disk
drive
being
tested
when
the
server
stopped
responding
and
try
the
diagnostic
test
again.
2.
If
the
hard
disk
drive
diagnostic
test
runs
successfully,
replace
the
drive
you
removed
with
a
new
one.
Note:
See
“System”
on
page
112
to
determine
which
components
should
be
replaced
by
a
field
service
technician.
General
problems
Symptom
FRU/action
Problems
such
as
broken
cover
locks
or
indicator
LEDs
not
working
v
Broken
CRU/FRU
Note:
See
“System”
on
page
112
to
determine
which
components
should
be
replaced
by
a
field
service
technician.
Intermittent
problems
Symptom
FRU/action
A
problem
occurs
only
occasionally
and
is
difficult
to
detect.
1.
Verify
that:
v
All
cables
and
cords
are
connected
securely
to
the
rear
of
the
server
and
attached
options.
v
When
the
server
is
turned
on,
air
is
flowing
from
the
rear
of
the
server
at
the
fan
grill.
If
there
is
no
airflow,
the
fan
is
not
working.
This
causes
the
server
to
overheat
and
shut
down.
v
Ensure
that
the
SCSI
bus
and
devices
are
configured
correctly
and
that
the
last
external
device
in
each
SCSI
chain
is
terminated
correctly.
2.
Check
the
system
error
log.
90
xSeries
335
Type
8676,
Type
8830:
Hardware
Maintenance
Manual
and
Troubleshooting
Guide