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Chapter
4.
Checkpoints
Checkpoints
display
on
the
media
subsystem
operator
panel
and
the
virtual
terminal
while
the
system
is
powering
on
and
going
through
the
initial
program
load
(IPL).
This
chapter
explains
the
IPL
flow
of
the
system
and
provides
a
table
that
lists
checkpoints
that
you
might
see
in
the
operator
panel
and
in
a
virtual
terminal
window
on
the
HMC.
IPL
Flow
The
IPL
process
starts
when
ac
power
is
connected
to
the
system.
The
IPL
process
has
the
following
phases:
v
Phase
1:
Service
Processor
Initialization
Phase
1
starts
when
ac
power
is
connected
to
the
system
and
ends
when
OK
is
displayed
in
the
operator
panel.
8xxx
checkpoints
are
displayed
during
this
phase.
Several
9xxx
codes
may
also
be
displayed.
Service
processor
menus
are
available
at
the
end
of
this
phase
by
striking
any
key
on
the
console
keyboard.
v
Phase
2:
Hardware
Initialization
by
the
Service
Processor
Phase
2
starts
when
system
power-on
is
initiated
by
pressing
the
power
on
button
on
the
operator
panel.
9xxx
checkpoints
are
displayed
during
this
time.
91FF,
the
last
checkpoint
in
this
phase,
indicates
the
transition
to
phase
3
is
taking
place.
v
Phase
3:
System
Firmware
initialization
At
phase
3,
a
system
processor
takes
over
control
and
continues
initializing
partition
resources.
During
this
phase,
checkpoints
in
the
form
Exxx
are
displayed.
E105,
the
last
checkpoint
in
this
phase,
indicates
that
control
is
being
passed
to
the
operating
system
boot
program.
v
Phase
4:
Operating
System
Boot
When
the
operating
system
starts
to
boot,
checkpoints
in
the
form
0xxx
and
2xxx
are
displayed
if
the
system
is
booting
AIX.
This
phase
ends
when
the
operating
system
login
prompt
displays
on
the
operating
system
console.
The
following
table
outlines
the
IPL
phases
from
power-on
to
the
operating
system
login
prompt,
matching
the
phases
to
corresponding
operator-panel
checkpoints
for
a
typical
partition
boot.
Also
listed
are
the
approximate
boot
times
for
each
phase,
along
with
their
dependencies
for
each
phase.
Note:
The
following
table
lists
the
major
checkpoints
only.
Phase
#
Checkpoints
on
Operator
Panel
or
HMC
Time
in
Phase
(minutes)
Major
Contributors
to
Time
in
Phase
Phase
1
8xxx
=>
OK
Approx.
1
Phase
2
9xxx
=>
91FF
3
to
6
Number
of
I/O
drawers
Phase
3
Exxx
=>
E105
1
to
3
Number
of
bootable
adapters
Phase
4
0xxx
or
2xxx
=>
blank
(if
booting
AIX)
2
to
30+
Number
of
SSA
drives
Number
of
SCSI
drives
Number
of
async
sessions
Number
of
processors
Number
of
adapters
Amount
of
memory
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