resource
allocated
to
that
LP.
For
example,
an
LP
defined
to
have
two
CPs
on
a
three-way
CPC
can
never
be
allocated
more
than
67%
of
the
CP
resources
no
matter
what
its
processing
weight.
Capping
Processing
Weights:
The
PR/SM
capping
function
provides
the
capability
of
limiting
CPU
resource
usage
for
one
or
more
LP.
The
relative
processing
weight
of
an
LP
is
its
capping
value.
A
capped
LP
running
at
its
cap
does
not
have
access
to
the
CP
resources
that
are
not
utilized
by
other
LPs.
However,
CP
resources
that
are
not
used
by
a
capped
LP
can
be
used
by
other
LPs.
Equitable
distribution
of
CP
resources
is
maintained.
Capping
values
can
be
dynamically
adjusted.
The
capping
function
can
be
turned
on
and
off,
and
provides
the
capability
of
specifying
capping
for
individual
LPs
without
a
re-IPL
of
the
LP.
Use
the
Change
LPAR
Controls
task
from
the
CPC
Operational
Customization
Tasks
list
to
change
the
Capped
setting
for
the
specific
partition.
Checking
the
Initial
Capping
check
box
turns
the
capping
function
on.
Select
the
Save
Running
System
push
button
to
have
this
option
take
effect
immediately
for
an
active
partition.
(Save
and
Change
will
change
the
running
system
and
update
the
partition’s
profile.
Save
to
Profiles
will
not
change
the
running
system;
it
will
just
save
the
new
definition
to
the
partition’s
profile.)
Alternatively,
if
you
do
not
need
to
change
a
running
system,
the
Customize/Delete
Activation
Profiles
task
available
from
the
CPC
Operational
Customization
Tasks
list
can
be
used
to
open
a
reset
or
image
profile
to
cap
processing
weight
for
an
LP.
This
change
would
take
effect
when
the
partition
is
activated.
An
LP’s
relative
weight
is
divided
by
the
number
of
shared
logical
CPs
online
for
the
LP
to
give
the
share
for
each
logical
CP.
The
goal
of
the
LPAR
dispatcher
is
to
give
each
logical
CP
its
share
of
the
total
relative
weight.
Capping
is
done
on
a
logical
CP
basis.
An
LP’s
share
of
CP
resources
is
determined
by
its
weight.
The
combined
processing
weights
for
all
active
LPs
are
considered
to
be
100%
of
the
available
shared
CP
resources.
The
activating
and
deactivating
of
LPs
changes
the
amount
of
CP
resources
available
to
LPs,
making
the
percentage
of
CP
resources
requested
for
each
active
LP
a
relative
one,
and
not
a
fixed
percentage
of
CP
resources.
Note:
If
an
extremely
low
processing
weight
is
specified
for
a
capped
logical
partition,
tasks
such
as
Reset
Clear,
Activate,
and
Deactivate
may
fail
due
to
a
time-out.
To
prevent
this
problem,
avoid
use
of
capping
in
conjunction
with
low
processing
weight.
A
preferable
solution
is
specification
of
a
processing
weight
that
results
in
a
1/10
share
(the
suggested
minimum)
or
greater
of
one
physical
CP
for
a
logical
CP.
If
the
extremely
low
weight
cannot
be
avoided,
temporarily
turn
capping
off
for
the
logical
partition
prior
to
activating,
deactivating,
resetting,
or
loading
the
logical
partition.
Restore
the
cap
following
completion
of
these
operations.
Enforcement
of
Processing
Weights
Processing
Weight
Management
PR/SM
LPAR
enforces
LP
processing
weights
as
follows:
v
For
LPs
with
processor
resource
capping,
PR/SM
LPAR
enforces
the
processing
weights
to
within
3.6%
of
the
LP’s
physical
CP
share
for
logical
CPs
entitled
to
Chapter
3.
Determining
the
Characteristics
of
Logical
Partitions
3-39
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