The
following
table
indicates
the
maximum
central
storage
possible
for
the
System
z9
models:
Table
2-7.
Coupling
Facility
LP
Storage
Definition
Capabilities
Models
Maximum
Central
Storage
(GB)
System
z9
BC
Model
R07
Model
S07
64
64
System
z9
EC
Model
S08
Model
S18
Model
S28
Model
S38
Model
S54
128
256
384
512
512
Estimating
Coupling
Facility
Structure
Sizes
Estimating
coupling
facility
structure
sizes
is
useful
to
system
programmers
to
help
ensure
that
there
is
enough
coupling
facility
storage
to
meet
application
needs.
The
estimation
of
the
minimum
central
storage
requirements
of
your
List
or
Cache
structure
has
been
superseded
by
the
following
two
commands
used
by
the
CFSizer
Utility
to
make
space
calculations
in
the
coupling
facility:
v
Compute
List-Structure
parameters:
For
computing
the
minimum
central
storage
requirements
for
a
List
structure.
(What
z/OS
calls
lock
structures
are
actually
a
special
form
of
list
structure.)
v
Compute
Cache-Structure
parameters:
For
computing
the
minimum
central
storage
requirements
for
a
Cache
structure.
IMPORTANT
NOTE
When
implementing
a
new
CFLEVEL
in
your
configuration,
redetermine
the
size
of
List
and
Cache
structures
using
the
CFSizer
Utility
and
update
the
CFRM
policy
with
the
newly
acquired
values.
For
more
information
on
the
CFSizer
Utility,
see
the
following
link:
http://www-1.ibm.com/servers/eserver/zseries/cfsizer/
Dump
Space
Allocation
in
a
Coupling
Facility
Dump
space
is
storage
you
define
using
the
DUMPSPACE
parameter
in
the
coupling
facility
resource
management
(CFRM)
policy.
It
is
set
aside
for
the
creation
of
dump
tables.
Dump
tables
are
portions
or
snapshots
of
a
structure
typically
saved
for
application
development
or
problem
determination
purposes.
The
coupling
facility
allocates
dump
space
in
multiples
of
the
coupling
facility
storage
increment.
Dump
tables
for
several
different
structures
can
exist
in
dump
space
at
the
same
time.
The
amount
of
storage
in
any
one
dump
table
depends
on
the
following
factors:
v
Amount
of
information
you
want
to
save
to
a
dump
table
The
software
subsystem
can
request
the
portions
of
a
structure
that
are
to
be
captured
in
the
dump
table.
For
example,
lock
tables,
lists
within
a
list
structure,
or
directory
entries
belonging
to
particular
storage
classes
or
castout
classes.
v
Free
dump
space
2-48
PR/SM
Planning
Guide
Summary of Contents for Z9
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