Dynamic
I/O
Configuration
is
supported
by
the
Hardware
Configuration
Definition
(HCD)
product
for
the
z/OS
or
z/VM
operating
system.
Note:
I/O
Configuration
control
should
be
enabled
for
a
single,
specific
logical
partition
only
during
the
short
period
of
time
when
it
is
permitted
to
write
a
new
IOCDS.
Only
the
IOCDS
to
be
written
should
have
its
write-protection
temporarily
reset.
All
other
IOCDSs
should
remain
write-protected
during
an
IOCDS
update
operation.
The
Security
Administrator
should
remain
logged
onto
the
console
until
the
IOCDS
update
is
complete,
and
the
IOCDS
update
authority
is
disabled.
Note:
Neither
Isolation
nor
I/O
Configuration
Control
option
has
any
effect
on
the
sharing
of
CHPIDS
or
I/O
Devices.
Sharing
is
enabled
by
parameters
of
the
CHPID
statement
used
in
the
definition
of
the
IOCDS.
–
GLOBAL
PERFORMANCE
DATA
AUTHORITY
should
be
disabled
.
This
recommendation
is
based
on
a
desire
to
block
any
possibility
of
a
partition
extracting
meaning
from
another
partition’s
performance
data.
–
CROSS-PARTITION
CONTROL
should
be
disabled
.
Enabling
cross-partition
control
permits
one
partition
to
disrupt
processing
in
other
partitions,
resulting
in
the
threat
of
denial
of
service
to
those
partition’s
users.
When
cross-partition
control
is
disabled,
Automatic
Reconfiguration
Facility
(ARF)
is
disabled.
ARF
uses
the
cross-partition
control
capability
of
PR/SM.
ARF
is
not
generally
appropriate
in
a
tightly
managed,
secure
system.
–
WORKLOAD
MANAGER
should
be
disabled
.
Enabling
Workload
Manager
(WLM)
enables
Dynamic
CHPID
Management
(DCM)
to
optimize
I/O
throughput
across
an
LPAR
cluster
by
sharing
CHPIDs
among
partitions
who
have
joined
the
cluster.
Any
logical
partition
that
is
WLM
enabled
may
join
the
cluster
and
therefore
share
CHPIDs
reserved
for
use
by
members
of
the
specified
cluster.
Furthermore,
partitions
within
a
cluster
may
issue
a
special
DIAGNOSE
instruction
to
obtain
information
about
other
partitions
within
the
same
cluster
even
when
Global
Performance
Data
Authority
is
not
enabled.
Reconfiguring
the
System
Deconfiguration
The
recommended
way
to
deconfigure
objects
owned
by
a
logical
partition
is
to
first
deconfigure
the
object
from
the
operating
system’s
point
of
view,
and
when
necessary
(z/OS
interacts
with
PR/SM
to
complete
the
reconfiguration
process,
other
operating
systems
may
not),
use
the
hardware
system
console’s
commands
to
request
PR/SM
to
deconfigure
the
identical
object.
The
z/OS
operating
system
expects
operations
personnel
to
use
the
HMC/SE
based
configuration
tasks
to
request
deconfiguration
of
a
logical
partition
object.
Reconfiguration
If
the
objects
are
not
presently
part
of
the
logical
partition’s
configuration,
they
must
be
made
available
to
the
partition
with
the
use
of
facilities
at
the
hardware
systems
console.
Channel
Paths
(CHPIDs)
may
be
made
available
to
the
target
logical
partition
using
the
CHPID
Operations
tasks;
reserved
storage
may
be
available,
but
if
it
isn’t,
it
can
be
made
available
by
a
Security
Administrator
action
by
updating
the
Image
profile’s
Storage
page
of
the
Customize/Delete
Activation
Profiles
task.
There
are
many
operational
considerations
relating
to
reconfiguration
that
are
covered
in
greater
detail
in
the
z/OS
MVS
Planning:
Operations
document
and
the
z/OS
MVS
Recovery
and
Reconfiguration
Guide
.
B-10
PR/SM
Planning
Guide
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