for
that
LP.
The
stated
maximum
supported
processors
for
a
particular
control
program
is
applied
against
the
sum
of
the
counts
of
all
processor
types
defined
to
the
partition.
Workload
Requirements
The
number
of
logical
CPs
defined
also
depends
on
the
workload
requirements
and
the
ability
of
the
control
program
or
application
program
to
effectively
use
multiple
logical
CPs.
v
The
number
of
CPs
required
to
meet
the
peak
demands
of
the
LP
When
a
sharing
LP
is
activated,
it
should
be
assigned
enough
CPs
to
meet
its
peak
demands
and
any
immediate
growth
requirements.
Note:
Too
few
CPs
could
limit
the
number
of
potential
transactions,
and
too
many
active
logical
CPs
could
affect
performance.
In
addition
to
a
number
of
initially
online
logical
CPs
sufficient
to
meet
the
current
peak
demands
of
the
LP,
the
definition
should
include
the
number
of
reserved
logical
CPs
required
for
possible
growth
requirements.
For
an
LP
that
uses
dedicated
CPs,
the
number
of
CPs
required
to
meet
peak
demand
should
be
determined.
v
The
number
of
CPs
shared
by
an
LP
The
physical
CPs
used
by
a
sharing
LP
can
be
limited
by
the
number
of
CPs
defined
to
it.
For
example,
on
a
six-way
CPC,
a
two-way
LP
could
never
get
more
than
a
third
of
the
CP
resources.
On
most
machines,
there
are
many
possible
configurations.
For
example,
if
a
two-way
CPC
is
to
be
used
by
three
sharing
LPs,
configuration
options
include
all
two-way
LPs,
all
one-way
LPs,
or
a
mix
of
one-way
and
two-way
LPs.
Three
two-way
LPs
should
only
be
considered
if
all
LPs
have
peak
demands
exceeding
the
capacity
of
a
one-way
CPC.
In
this
instance,
the
average
requirements
during
peak
periods
should
be
examined
carefully
to
ensure
that
the
total
does
not
exceed
the
capacity
of
the
CPC.
Three
1-way
LPs
are
optimal
for
ITR
performance
and
should
be
used
if
no
LP
has
peaks
exceeding
half
of
the
capacity
of
a
two-way
CPC.
Central
Processor
Recommendations
for
Intelligent
Resource
Director
(IRD)
It
is
highly
recommended
that
the
number
of
initial
CPUs
specified
be
maximized
for
logical
partitions
whose
CPU
resources,
enabled
by
IRD
clustering
technology,
are
managed
by
z/OS’s
WorkLoad
Manager
(WLM).
WLM’s
LPAR
CPU
Management
component
will
automatically
configure
off
all
initially
online
logical
CPs
in
excess
of
the
minimum
required
to
meet
current
demands
so
over-specification
has
no
negative
consequences.
Moreover,
only
those
logical
CPs
defined
as
initially
online,
or
configured
on
explicitly
by
operator
commands,
will
subsequently
be
configured
on
by
WLM
if
and
when
increases
in
workload
requirements
demand.
Specification
of
reserved
logical
CPs
should
be
used
only
to
accommodate
potential
increases
to
the
number
of
installed
physical
CPs.
WLM
CPU
management
does
not
currently
manage
any
IFA
or
zIIP
logical
processors
defined
to
a
WLM
managed
logical
partition.
As
such,
the
maximizing
of
initial
CPUs
recommendation
applies
only
to
the
general
purpose
processor
Chapter
3.
Determining
the
Characteristics
of
Logical
Partitions
3-29
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