through
a
network
or
interconnected
networks
and
acts
as
an
intermediary
between
the
higher
protocol
layers
and
the
physical
network.
I/O
See
input/output.
I/O
group
A
collection
of
virtual
disks
(VDisks)
and
node
relationships
that
present
a
common
interface
to
host
systems.
IP
See
Internet
Protocol
.
L
local
fabric
In
SAN
Volume
Controller,
those
storage
area
network
(SAN)
components
(such
as
switches
and
cables)
that
connect
the
components
(nodes,
hosts,
switches)
of
the
local
cluster
together.
logical
unit
(LU)
An
entity
to
which
Small
Computer
System
Interface
(SCSI)
commands
are
addressed,
such
as
a
virtual
disk
(VDisk)
or
managed
disk
(MDisk).
logical
unit
number
(LUN)
The
SCSI
identifier
of
a
logical
unit
within
a
target.
(S)
LU
See
logical
unit
.
LUN
See
logical
unit
number
.
M
managed
disk
(MDisk)
A
Small
Computer
System
Interface
(SCSI)
logical
unit
that
a
redundant
array
of
independent
disks
(RAID)
controller
provides
and
a
cluster
manages.
The
MDisk
is
not
visible
to
host
systems
on
the
storage
area
network
(SAN).
managed
disk
group
A
collection
of
managed
disks
(MDisks)
that,
as
a
unit,
contain
all
the
data
for
a
specified
set
of
virtual
disks
(VDisks).
mapping
See
FlashCopy
mapping
.
MDisk
See
managed
disk
.
N
node
One
SAN
Volume
Controller.
Each
node
provides
virtualization,
cache,
and
Copy
Services
to
the
storage
area
network
(SAN).
O
object
In
object-oriented
design
or
programming,
a
concrete
realization
of
a
class
that
consists
of
data
and
the
operations
associated
with
that
data.
offline
Pertaining
to
the
operation
of
a
functional
unit
or
device
that
is
not
under
the
continual
control
of
the
system
or
of
a
host.
online
Pertaining
to
the
operation
of
a
functional
unit
or
device
that
is
under
the
continual
control
of
the
system
or
of
a
host.
Glossary
101
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