security
administrator.
Any
user(s)
of
the
HMC
who
are
defined
with
a
user
mode
of
System
Programmer
or
Service
Representative.
Server
Time
Protocol
(STP).
A
time
synchronization
feature
designed
to
enable
multiple
servers
to
maintain
time
synchronization
with
each
other.
This
technology
uses
coupling
links
to
exchange
timing
signals
directly
between
participating
CECs.
STP
can
operate
either
in
a
mode
with
no
Sysplex
Timer
or
can
operate
in
a
mixed
mode
in
conjunction
with
a
Sysplex
Timer.
service
representative.
A
person
who
performs
maintenance
services
for
IBM
hardware
products
or
systems.
SFM.
Sysplex
Failure
Manager.
SIE.
Start
Interpretive
Execution
(370-XA
or
ESA/370
instruction).
SNA.
Systems
Network
Architecture.
start
interpretive
execution
(SIE).
An
instruction
that
causes
the
CPU
to
enter
interpretive-execution
mode
and
to
begin
running
the
guest
program.
storage.
(1)
A
functional
unit
into
which
data
can
be
placed,
in
which
they
can
be
retained,
and
from
which
they
can
be
retrieved.
(T)
(2)
The
action
of
placing
data
into
a
storage
device.
(I)
(A)
storage
control.
In
a
DASD
subsystem,
the
component
that
connects
the
DASD
to
the
host
channels,
performs
channel
commands,
and
controls
the
DASD
devices.
For
example,
the
3990
Model
2
and
Model
3
are
storage
controls.
storage
director.
In
a
logical
entity
consisting
of
one
or
more
physical
storage
paths
in
the
same
storage
cluster.
STP.
See
Server
Time
Protocol
(STP).
subchannel.
In
370-XA
and
ESA/390
modes,
the
facility
that
provides
all
of
the
information
necessary
to
start,
control,
and
complete
an
I/O
operation.
subchannel
number.
A
system-unique
16-bit
value
used
to
address
a
subchannel.
subsystem.
A
secondary
or
subordinate
system,
or
programming
support,
usually
capable
of
operating
independently
of
or
asynchronously
with
a
controlling
system.
(T)
switched
point-to-point
channel
path
configuration.
In
an
ESCON
or
FICON
I/O
interface,
a
configuration
that
consists
of
a
link
between
a
channel
and
an
ESCON
Director
and
one
or
more
links
from
the
ESCD,
each
of
which
attaches
to
a
control
unit.
This
configuration
depends
on
the
capabilities
of
the
ESCD
for
establishing
and
removing
connections
between
channels
and
control
units.
Contrast
with
point-to-point
channel
path
configuration
.
switched
point-to-point
topology.
A
network
topology
that
uses
switching
facilities
to
provide
multiple
communication
paths
between
channels
and
control
units.
See
also
multidrop
topology
.
Contrast
with
point-to-point
topology
.
synchronous.
(1)
Pertaining
to
two
or
more
processes
that
depend
on
the
occurrence
of
specific
events,
such
as
common
timing
signals.
(T).
(2)
Occurring
with
a
regular
or
predictable
time
relationship.
Contrast
with
asynchronous
.
sysplex.
A
set
of
systems
communicating
and
cooperating
with
each
other
through
certain
multisystem
hardware
components
and
software
services
to
process
customer
workloads.
Sysplex
Timer.
An
IBM
table-top
unit
that
synchronizes
the
time-of-day
(TOD)
clocks
in
as
many
as
16
processors
or
processor
sides.
system
administrator.
Any
user(s)
with
access
to
the
Hardware
Management
Console
(HMC).
system
control
program
(SCP).
Programming
that
is
fundamental
to
the
operation
of
the
system.
SCPs
include
MVS,
VM,
and
VSE
operating
systems
and
any
other
programming
that
is
used
to
operate
and
maintain
the
system.
Synonymous
with
operating
system
.
system
reset.
To
reinitialize
the
execution
of
a
program
by
repeating
the
load
operation.
Systems
Network
Architecture
(SNA).
The
description
of
the
logical
structure,
formats,
protocols,
and
operational
sequences
for
transmitting
information
units
through,
and
controlling
the
configuration
and
operation
of,
networks.
T
threshold.
A
level,
point,
or
value
above
which
something
is
true
or
will
take
place
and
below
which
it
is
not
true
or
will
not
take
place.
time-of-day
(TOD)
clock.
A
system
hardware
feature
that
is
incremented
once
every
microsecond,
and
provides
a
consistent
measure
of
elapsed
time
suitable
for
indicating
date
and
time.
The
TOD
clock
runs
regardless
of
whether
the
processor
is
in
a
running,
wait,
or
stopped
state.
TOD.
Time
of
day.
topology.
The
physical
or
logical
arrangement
of
nodes
in
a
computer
network.
TPF.
Transaction
processing
facility.
D-8
PR/SM
Planning
Guide
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