Workload
Charging
by
Soft-Capping
to
a
Defined
Capacity
Workload
charging
introduces
the
capability
to
pay
software
license
fees
based
on
the
size
of
the
LP
the
product
is
running
in,
rather
than
on
the
total
capacity
of
the
CPC.
The
capability
is
enabled
by
the
LPAR
clustering
technology
of
the
System
z9
servers
together
with
the
License
Manager
component
of
z/OS.
Each
LP
is
assigned
a
defined
capacity
by
the
installation
in
terms
of
Millions
of
Service
Units
(MSUs).
WLM
helps
ensure
that
the
rolling
4-hour
average
CPU
utilization
for
the
LP
does
not
exceed
this
amount
by
tracking
the
CPU
utilization
for
the
logical
partition.
If
the
4-hour
average
CPU
consumption
of
the
LP
exceeds
the
defined
capacity
of
the
LP,
WLM
dynamically
activates
LPAR
capping
(soft-capping).
When
the
rolling
4-hour
average
dips
below
the
defined
capacity,
the
soft-cap
is
removed.
WLM
will
not
dynamically
adjust
the
defined
capacity
for
an
LP.
This
is
the
responsibility
of
the
installation.
If
an
LP
consistently
exceeds
its
defined
capacity,
the
license
certificates
and
the
defined
capacity
of
the
LP
should
be
adjusted
to
reduce
the
amount
of
time
the
LP
is
soft-capped.
If
you
have
a
configuration
where
the
LP
weights
move
significantly
from
one
LP
to
another
according
to
shift,
then
you
must
license
the
products
in
each
LP
at
the
highest
capacity
that
will
be
used
by
that
LP.
Recommendations
on
Setting
Up
an
LPAR
Cluster
v
An
LPAR
cluster
is
a
collection
of
two
or
more
logical
partitions,
on
a
particular
CPC,
that
are
part
of
the
same
parallel
sysplex.
LPAR
clusters
do
not
span
CPCs
as
do
parallel
sysplexes.
Though
the
member
LPs
of
an
LPAR
cluster
will
all
be
in
the
same
parallel
sysplex,
all
members
of
a
parallel
sysplex
might
not
be
members
of
the
same
LPAR
cluster.
A
given
parallel
sysplex
can
have
member
LPs
that
belong
to
multiple
LPAR
clusters,
each
on
a
different
CPC.
v
Identify
logical
partitions
on
the
CPC
that
will
be
in
the
cluster
(members
of
the
same
parallel
sysplex).
A
single
CPC
can
have
several
LPAR
clusters
just
as
a
single
CPC
can
have
many
LPs,
each
having
membership
in
a
different
parallel
sysplex.
v
IBM
recommends
allocation
of
shared
CPs
and
enablement
of
WLM
management
for
cluster
members
(see
Note
1).
The
number
of
initially
online
CPs
should
be
maximized
to
provide
optimum
flexibility
to
WLM.
The
number
of
reserved
CPs
defined
should
be
the
maximum
allowed
for
an
LP
in
your
configuration
minus
the
number
of
initially
online
CPs.
See
for
additional
information
on
central
processors.
v
Establish
an
initial
weight
for
each
LP
in
the
cluster.
This
will
be
the
weight
for
the
LP
immediately
after
it
is
activated
(see
Note
2).
Triple
digit
values
should
be
used,
wherever
possible,
for
initial
weights
because
WLM
reapportions
weights
on
a
percentage
basis.
The
total
weight
of
the
cluster
will
equal
the
sum
of
all
the
initial
weights
of
its
member
LPs.
Leave
the
minimum
and
maximum
weights
blank
or
make
the
range
as
wide
as
possible
(optimally
1
to
999)
to
provide
WLM
maximum
flexibility
as
it
distributes
CPU
resource
among
the
cluster
members.
v
Enable
each
LP
in
the
cluster
for
WLM
management.
v
To
enable
DCM
of
managed
channel
paths
for
a
logical
partition,
the
name
specified
on
the
IOCLUSTER
keyword
for
managed
channel
paths
in
the
IOCDS
must
match
the
sysplex
name
of
the
software
running
in
the
logical
partition.
See
for
more
information
on
the
IOCLUSTER
keyword.
v
Calculation
to
estimate
the
number
of
cache
structures
that
can
be
supported:
3-46
PR/SM
Planning
Guide
Summary of Contents for Z9
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