command.
(1)
A
character
string
from
a
source
external
to
a
system
that
represents
a
request
for
system
action.
(2)
A
request
from
a
terminal
for
performance
of
an
operation
or
execution
of
a
program.
(3)
A
value
sent
on
an
I/O
interface
from
a
channel
to
a
control
unit
that
specifies
the
operation
to
be
performed.
configuration.
(1)
The
arrangement
of
a
computer
system
or
network
as
defined
by
the
nature,
number,
and
the
chief
characteristics
of
its
functional
units.
More
specifically,
the
term
configuration
may
refer
to
a
hardware
configuration
or
a
software
configuration.
(I)
(A)
(2)
In
an
ESCON
Director,
the
physical
connection
capability
determined
by
a
set
of
attributes.
The
attribute
values
specify
the
connectivity
control
status
and
identifiers
associated
with
the
ESCD
and
its
ports.
console.
A
logical
device
used
for
communication
between
the
user
and
the
system.
control
program.
A
computer
program
designed
to
schedule
and
to
supervise
the
execution
of
programs
of
a
computer
system.
(I)
(A)
control
unit.
A
hardware
unit
that
controls
the
reading,
writing,
or
displaying
of
data
at
one
or
more
input/output
units.
controller.
A
unit
that
controls
input/output
operations
for
one
or
more
devices.
conversion.
(1)
In
programming
languages,
the
transformation
between
values
that
represent
the
same
data
item
but
belong
to
different
data
types.
Information
can
be
lost
through
conversion
because
accuracy
of
data
representation
varies
among
different
data
types.
(I)
(2)
The
process
of
changing
from
one
method
of
data
processing
to
another
or
from
one
data
processing
system
to
another.
(3)
The
process
of
changing
from
one
form
of
representation
to
another;
for
example,
to
change
from
decimal
representation
to
binary
representation.
coupling
facility.
A
special
logical
partition
that
provides
high-speed
caching,
list
processing,
and
locking
functions
in
a
sysplex.
coupling
facility
channel.
A
high
bandwidth
fiber
optic
channel
that
provides
the
high-speed
connectivity
required
for
data
sharing
between
a
coupling
facility
and
the
central
processor
complexes
(or
logical
partitions)
directly
attached
to
it.
coupling
facility
control
code.
The
Licensed
Internal
Code
(LIC)
that
runs
in
a
coupling
facility
logical
partition
to
provide
shared
storage
management
functions
for
a
sysplex.
CP.
Central
processor.
CPC.
Central
processor
complex.
CPU.
Central
processing
unit.
CS.
(1)
Central
storage.
(2)
Channel
set.
(3)
Control
storage.
CTC.
(1)
Channel-to-channel.
(2)
Mnemonic
for
an
ESCON
channel
attached
to
another
ESCON
channel.
CUADD.
Control
unit
logical
address.
Customer
Information
Control
System
(CICS).
An
IBM
licensed
program
that
enables
transactions
entered
at
remote
terminals
to
be
processed
concurrently
by
user-written
application
programs.
It
includes
facilities
for
building,
using,
and
maintaining
data
bases.
D
DASD.
Direct
access
storage
device.
DCM.
Dynamic
CHPID
Management.
data
transfer.
(1)
The
result
of
the
transmission
of
data
signals
from
any
data
source
to
a
data
receiver.
(2)
The
movement,
or
copying,
of
data
from
one
location
and
the
storage
of
the
data
at
another
location.
deactivate
logical
partition.
An
operator-initiated
procedure
that
releases
the
hardware
assigned
to
a
logical
partition,
making
it
available
to
other
partitions.
Contrast
with
activate
logical
partition
.
Note:
The
operator
should
first
deactivate
the
system
control
program,
if
possible
or
necessary,
and
then
reactivate
the
partition,
which
could
provide
a
reset
to
that
partition,
if
required.
deallocate.
To
release
a
resource
assigned
to
a
task.
Contrast
with
allocate
.
deconfigure.
To
remove
a
system
resource
from
the
currently
active
configuration,
usually
through
the
system
control
program
(SCP)
or
through
the
Configuration
(CONFIG)
frame
on
the
system
console.
default.
Pertaining
to
an
attribute,
value,
or
option
that
is
assumed
when
none
is
explicitly
specified.
(I)
degraded.
Pertaining
to
a
mode
of
operation
in
which
the
system
operates
with
some
resources
not
available.
device.
A
mechanical,
electrical,
or
electronic
contrivance
with
a
specific
purpose.
device
address.
The
8
rightmost
bits
of
an
I/O
address
that
identify
a
particular
I/O
device
and
a
control
unit
on
the
designated
channel.
device
number.
In
a
channel
subsystem,
four
hexadecimal
digits
that
uniquely
identify
an
I/O
device.
direct
access
storage
device
(DASD).
A
device
in
which
access
time
is
effectively
independent
of
the
location
of
the
data.
Glossary
D-3
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