Structures
share
dump
space.
If
a
structure
is
using
some
of
the
dump
space,
other
structures
cannot
use
that
portion
of
the
dump
space
until
it
it
released.
v
Characteristics
of
the
structure
saved
to
a
dump
table
When
saving
structure
objects
to
a
dump
table,
the
amount
of
dump
space
used
depends
on
the
parameters
specified
for
the
structure.
For
example,
list
entry
size,
the
number
of
list
entries
in
a
specified
list,
the
number
of
directory
entries
in
a
castout
class,
whether
adjunct
data
is
included,
etc.
The
coupling
facility
can
return
the
maximum
requested
dump
space
value.
This
indicates
the
largest
amount
of
dump
space
requested
by
the
software
subsystems
using
the
coupling
facility.
This
value
allows
you
to
adjust
the
amount
of
allocated
dump
space
to
better
match
actual
usage.
Coupling
Facility
LP
Activation
Considerations
At
LP
activation,
coupling
facility
control
code
automatically
loads
into
the
coupling
facility
LP
from
support
element
hard
disk.
No
initial
program
load
(IPL)
of
an
operating
system
is
necessary
or
supported
in
the
coupling
facility
LP.
All
coupling
facility
channel
path
types
targeted
to
be
brought
online
will
automatically
be
configured
online.
Note:
All
channel
paths
types
that
are
targeted
to
be
brought
online
will
automatically
be
configured
online
if
the
coupling
facility
LP
is
redefined
as
an
ESA
mode
LP.
Coupling
Facility
Shutdown
Considerations
IMPORTANT
NOTE
It
is
important
to
properly
remove
all
structures
from
a
coupling
facility
that
will
be
permanently
taken
out
of
the
sysplex
prior
to
shutting
down
the
coupling
facility.
Failure
to
remove
all
structures
may
result
in
a
pending
condition
(or
transitioning
structure)
when
attempting
to
allocate
structures
in
a
new
coupling
facility.
Reactivation
of
the
old
coupling
facility
may
be
required
to
resolve
the
condition.
A
running
coupling
facility
LP
can
contain
structures
and
data
important
to
a
sysplex.
Make
sure
that
you
take
proper
precautions
to
preserve
these
structures
and
data
prior
to
a
power
off,
power-on
reset
(POR),
LP
deactivation,
or
shutdown
(using
the
coupling
facility
control
code
SHUTDOWN
command)
of
the
coupling
facility
LP.
Coupling
facility
structures
and
data
will
not
survive
any
of
these
actions.
Loss
of
coupling
facility
structures
and
data
will
occur
regardless
of
the
volatility
state
of
the
coupling
facility
including
situations
where
a
battery
backup
is
in
place
For
more
information
on
removing,
replacing,
or
shutting
down
a
coupling
facility,
see
z/OS
MVS
Setting
Up
a
Sysplex
,
SA22-7625.
Coupling
Facility
LP
Operation
Considerations
Coupling
facility
control
code
runs
in
the
coupling
facility
LP
with
minimal
operator
intervention.
Operator
activity
is
confined
to
the
Operating
Systems
Messages
task.
PR/SM
LPAR
limits
the
hardware
operator
controls
usually
available
for
LPs
to
avoid
unnecessary
operator
activity.
Chapter
2.
Planning
Considerations
2-49
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