Chapter
3.
Verifying
the
Hardware
Operations
Running
diagnostics
verifies
system
hardware
operation.
The
diagnostics
consist
of
online
diagnostics
and
standalone
diagnostics.
Note:
The
diagnostic
procedures
described
in
this
chapter
must
be
run
for
each
processor
subsystem
installed
in
a
rack.
Attention:
The
AIX
operating
system
must
be
installed
in
a
partition
in
order
to
run
online
diagnostics
on
that
partition.
If
the
AIX
operating
system
is
not
installed,
use
the
standalone
diagnostic
procedures.
Online
diagnostics,
when
they
are
installed,
reside
with
AIX
in
the
file
system.
They
can
be
booted:
v
In
single
user
mode
(referred
to
as
service
mode
)
v
To
run
in
maintenance
mode
(referred
to
as
maintenance
mode
)
v
To
run
concurrently
with
other
applications
(referred
to
as
concurrent
mode
)
Standalone
diagnostics
must
be
booted
before
they
can
be
run.
If
booted,
the
diagnostics
have
no
access
to
the
AIX
error
log
or
the
AIX
configuration
data.
Online
and
Standalone
Diagnostics
Operating
Considerations
Note:
When
possible,
run
online
diagnostics
in
service
mode.
Online
diagnostics
perform
additional
functions
compared
to
standalone
diagnostics.
Running
online
diagnostics
in
service
mode
ensures
that
the
error
state
of
the
system
that
has
been
captured
in
NVRAM
is
available
for
your
use
in
analyzing
the
problem.
The
AIX
error
log
and
certain
SMIT
functions
are
only
available
when
diagnostics
are
run
from
the
disk
drive.
Consider
the
following
items
before
using
the
diagnostics:
v
Standalone
diagnostics
can
run
on
systems
configured
for
either
a
full
(or
single)
system
partition
or
a
multiple
partitioned
system.
When
running
in
a
partitioned
system,
the
device
from
which
you
are
booting
standalone
diagnostics
must
be
made
available
to
the
partition
dedicated
to
running
standalone
diagnostics.
This
may
require
moving
the
device
from
the
partition
that
currently
contains
the
boot
device
(for
example,
the
network
adapter
connected
to
the
Network
Installation
Management
(NIM)
server
that
has
a
standalone
diagnostic
image)
to
the
partition
used
to
run
standalone
diagnostics.
If
you
move
devices,
reboot
both
partitions.
For
more
information,
see
“Standalone
Diagnostic
Operation”
on
page
35.
v
When
diagnostics
are
installed,
the
device
support
for
some
devices
might
not
get
installed.
If
this
is
the
case,
that
device
does
not
display
in
the
diagnostic
test
list
when
running
disk-based
diagnostics.
v
When
running
diagnostics
in
a
partitioned
system,
diagnostics
function
only
with
the
resources
that
were
assigned
to
that
partition.
You
must
run
diagnostics
in
the
partition
containing
the
resource
that
you
want
to
test.
Identifying
the
Terminal
Type
to
the
Diagnostics
When
you
run
diagnostics,
you
must
identify
which
type
of
terminal
you
are
using.
If
the
terminal
type
is
not
known
when
the
FUNCTION
SELECTION
menu
is
displayed,
the
diagnostics
do
not
allow
you
to
continue
until
a
terminal
is
selected
from
the
DEFINE
TERMINAL
option
menu.
Choose
the
″
vt320
″
selection
when
running
diagnostics
from
an
HMC.
31
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