paths
that
are
associated
with
the
allegiance;
access
is
for
one
or
more
channel
programs
until
the
allegiance
ends.
RETAIN
See
remote
technical
assistance
information
network.
S
S/390
IBM
enterprise
servers
based
on
Enterprise
Systems
Architecture/390
(ESA/390).
S/390
is
the
currently
accepted
shortened
form
of
the
original
name
System/390
®
.
S/390
storage
Storage
arrays
and
logical
volumes
that
are
defined
as
connected
to
S/390
servers.
This
term
is
synonymous
with
count-key-data
storage.
SAID
See
system
adapter
identification
number.
SAM
See
sequential
access
method.
SAN
See
storage
area
network.
SBCON
See
Single-Byte
Command
Code
Sets
Connection.
screen
The
physical
surface
of
a
display
device
upon
which
information
is
shown
to
users.
SCSI
See
small
computer
system
interface.
SCSI
device
A
disk
drive
connected
to
a
host
through
an
I/O
interface
using
the
SCSI
protocol.
A
SCSI
device
is
either
an
initiator
or
a
target.
See
also
initiator
and
small
computer
system
interface.
SCSI-FCP
Synonym
for
Fibre
Channel
Protocol,
a
protocol
used
to
transport
data
between
an
open-systems
host
and
a
fibre-channel
adapter
on
an
DS8000.
See
also
Fibre
Channel
Protocol
and
small
computer
system
interface.
SCSI
host
systems
Host
systems
that
are
attached
to
the
DS8000
with
a
SCSI
interface.
Such
host
systems
run
on
UNIX,
i5/OS,
Windows
NT
®
,
Windows
2000,
or
Novell
NetWare
operating
systems.
SCSI
ID
A
unique
identifier
assigned
to
a
SCSI
device
that
is
used
in
protocols
on
the
SCSI
interface
to
identify
or
select
the
device.
The
number
of
data
bits
on
the
SCSI
bus
determines
the
number
of
available
SCSI
IDs.
A
wide
interface
has
16
bits,
with
16
possible
IDs.
SDD
See
IBM
Subsystem
Multipathing
Device
Driver.
secondary
control
unit
The
DS8000
to
which
a
Remote
Mirror
and
Copy
secondary
device
is
physically
attached.
self-timed
interface
(STI)
An
interface
that
has
one
or
more
conductors
that
transmit
information
serially
between
two
interconnected
units
without
requiring
any
clock
signals
to
recover
the
data.
The
interface
performs
clock
recovery
independently
on
each
serial
data
stream
and
uses
information
in
the
data
stream
to
determine
character
boundaries
and
inter-conductor
synchronization.
sequential
access
A
mode
of
accessing
data
on
a
medium
in
a
manner
that
requires
the
storage
device
to
access
consecutive
storage
locations
on
the
medium.
sequential
access
method
(SAM)
An
access
method
for
storing,
deleting,
or
retrieving
data
in
a
continuous
sequence
based
on
the
logical
order
of
the
records
in
the
file.
serial
connection
A
method
of
device
interconnection
for
determining
interrupt
priority
by
connecting
the
interrupt
sources
serially.
server
A
host
that
provides
certain
services
to
other
hosts
that
are
referred
to
as
clients.
A
functional
unit
that
provides
services
to
one
or
more
clients
over
a
network.
(GC)
service
boundary
A
category
that
identifies
a
group
of
components
that
are
unavailable
for
use
when
one
of
the
components
of
the
group
is
being
serviced.
Service
boundaries
are
provided
on
the
DS8000,
for
example,
in
each
host
bay
and
in
each
cluster.
Glossary
207
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