not
require
modifications
to
the
host
software
in
order
to
continue
to
provide
an
existing
function.
source
device
One
of
the
devices
in
a
dual-copy
or
remote-copy
volume
pair.
All
channel
commands
to
the
logical
volume
are
directed
to
the
source
device.
The
data
on
the
source
device
is
duplicated
on
the
target
device.
See
also
target
device.
spare
A
disk
drive
on
the
DS8000
that
can
replace
a
failed
disk
drive.
A
spare
can
be
predesignated
to
allow
automatic
dynamic
sparing.
Any
data
preexisting
on
a
disk
drive
that
is
invoked
as
a
spare
is
destroyed
by
the
dynamic
sparing
copy
process.
spatial
reuse
A
feature
of
serial
storage
architecture
that
enables
a
device
adapter
loop
to
support
many
simultaneous
read/write
operations.
See
also
serial
storage
architecture.
SSID
See
subsystem
identifier.
SSR
See
service
support
representative.
stacked
status
For
System
z,
the
condition
when
the
control
unit
is
in
a
holding
status
for
the
channel,
and
the
last
time
the
control
unit
attempted
to
present
the
status,
the
channel
responded
with
the
stack-status
control.
stage
operation
The
operation
of
reading
data
from
the
physical
disk
drive
into
the
cache.
staging
To
move
data
from
an
offline
or
low-priority
device
back
to
an
online
or
higher
priority
device,
usually
on
demand
of
the
system
or
on
request
of
the
user.
standard
volume
A
volume
that
emulates
one
of
several
System
z
volume
types,
including
3390-2,
3390-3,
3390-9,
3390-2
(3380-track
mode),
or
3390-3
(3380-track
mode),
by
presenting
the
same
number
of
cylinders
and
capacity
to
the
host
as
provided
by
the
native
System
z
volume
type
of
the
same
name.
STI
See
self-timed
interface.
storage
area
network
A
network
that
connects
a
company’s
heterogeneous
storage
resources.
storage
capacity
The
amount
of
data
that
a
storage
medium
can
hold;
usually
expressed
in
kilobytes,
megabytes,
or
gigabytes.
storage
complex
A
configuration
of
one
or
more
storage
units
that
is
managed
by
a
management
console.
storage
device
A
physical
unit
that
provides
a
mechanism
to
store
data
on
a
given
medium
such
that
it
can
be
subsequently
retrieved.
See
also
disk
drive
module.
storage
extent
The
minimum
contiguous
range
of
storage
on
a
physical
storage
device,
array,
or
rank
that
can
be
allocated
to
a
local
volume
storage
image
A
partitioning
of
a
storage
unit
that
provides
emulation
of
a
storage
server
with
one
or
more
storage
devices
that
provides
storage
capability
to
a
host
computer.
You
can
configure
more
than
one
storage
image
on
a
storage
unit.
(DS8000
series
only)
storage
server
A
physical
unit
that
manages
attached
storage
devices
and
provides
an
interface
between
them
and
a
host
computer
by
providing
the
function
of
one
or
more
logical
subsystems.
The
storage
server
can
provide
functions
that
the
storage
device
does
not
provide.
The
storage
server
has
one
or
more
clusters.
storage
unit
A
physical
unit
that
consists
of
a
storage
server
that
is
integrated
with
one
or
more
storage
devices
that
provide
storage
capability
to
a
host
computer.
storage
unit
identifier
A
unique
identifier
for
a
storage
unit
that
consists
of
a
manufacturer,
a
model
number,
a
type
number,
a
plant
of
manufacture,
and
a
sequence
number.
striping
A
technique
that
distributes
data
in
bit,
Glossary
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