If
all
types
of
devices
in
the
boot
list
have
been
polled
without
finding
a
bootable
image,
the
system
restarts.
This
action
gives
the
user
the
opportunity
to
start
the
System
Management
Services
(by
pressing
the
number
1
key
on
a
directly
attached
keyboard
or
the
number
1
on
an
ASCII
terminal)
before
the
system
attempts
to
boot
again.
Concurrent
Mode
Running
the
online
diagnostics
in
concurrent
mode
is
started
by
entering
diag
at
an
AIX
prompt.
Use
concurrent
mode
to
run
online
diagnostics
on
some
of
the
system
resources
while
the
system
is
running
normal
activity.
Because
the
system
is
running
in
normal
operation,
the
following
resources
cannot
be
tested
in
concurrent
mode:
v
SCSI
adapters
connected
to
paging
devices
v
Disk
drive
used
for
paging
v
Some
display
adapters
and
graphics
related
devices
v
Memory
(tested
during
POST)
v
Processor
(tested
during
POST)
The
following
levels
of
testing
exist
in
concurrent
mode:
v
The
share-test
level
tests
a
resource
while
the
resource
is
being
shared
by
programs
running
in
the
normal
operation.
This
testing
is
mostly
limited
to
normal
commands
that
test
for
the
presence
of
a
device
or
adapter.
v
The
sub-test
level
tests
a
portion
of
a
resource
while
the
remaining
part
of
the
resource
is
being
used
in
normal
operation.
For
example,
this
test
could
test
one
port
of
a
multiport
device
while
the
other
ports
are
being
used
in
normal
operation.
v
The
full-test
level
requires
the
device
not
be
assigned
to
or
used
by
any
other
operation.
This
level
of
testing
on
a
disk
drive
might
require
the
use
of
the
varyoff
command.
The
diagnostics
display
menus
to
allow
you
to
vary
off
the
needed
resource.
Chapter
6.
Using
the
Online
and
Standalone
Diagnostics
187
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