electrical-to-optical
signal
conversions
for
high-speed
networking.
A
GBIC
can
be
hot
swapped.
See
also
small
form-factor
pluggable
.
Global
Copy.
Refers
to
a
remote
logical
drive
mirror
pair
that
is
set
up
using
asynchronous
write
mode
without
the
write
consistency
group
option.
This
is
also
referred
to
as
″
Asynchronous
Mirroring
without
Consistency
Group.
″
Global
Copy
does
not
ensure
that
write
requests
to
multiple
primary
logical
drives
are
carried
out
in
the
same
order
on
the
secondary
logical
drives
as
they
are
on
the
primary
logical
drives.
If
it
is
critical
that
writes
to
the
primary
logical
drives
are
carried
out
in
the
same
order
in
the
appropriate
secondary
logical
drives,
Global
Mirroring
should
be
used
instead
of
Global
Copy.
See
also
asynchronous
write
mode
,
Global
Mirroring
,
remote
mirroring
,
Metro
Mirroring
.
Global
Mirroring.
Refers
to
a
remote
logical
drive
mirror
pair
that
is
set
up
using
asynchronous
write
mode
with
the
write
consistency
group
option.
This
is
also
referred
to
as
″
Asynchronous
Mirroring
with
Consistency
Group.
″
Global
Mirroring
ensures
that
write
requests
to
multiple
primary
logical
drives
are
carried
out
in
the
same
order
on
the
secondary
logical
drives
as
they
are
on
the
primary
logical
drives,
preventing
data
on
the
secondary
logical
drives
from
becoming
inconsistent
with
the
data
on
the
primary
logical
drives.
See
also
asynchronous
write
mode
,
Global
Copy
,
remote
mirroring
,
Metro
Mirroring
.
graphical
user
interface
(GUI).
A
type
of
computer
interface
that
presents
a
visual
metaphor
of
a
real-world
scene,
often
of
a
desktop,
by
combining
high-resolution
graphics,
pointing
devices,
menu
bars
and
other
menus,
overlapping
windows,
icons,
and
the
object-action
relationship.
GUI.
See
graphical
user
interface.
HBA.
See
host
bus
adapter
.
hdisk.
An
AIX
term
representing
a
logical
unit
number
(LUN)
on
an
array.
host.
A
system
that
is
directly
attached
to
the
storage
subsystem
through
a
fibre-channel
input/output
(I/O)
path.
This
system
is
used
to
serve
data
(typically
in
the
form
of
files)
from
the
storage
subsystem.
A
system
can
be
both
a
storage
management
station
and
a
host
simultaneously.
host
bus
adapter
(HBA).
An
interface
between
the
fibre-channel
network
and
a
workstation
or
server.
host
computer.
See
host
.
host
group.
An
entity
in
the
storage
partition
topology
that
defines
a
logical
collection
of
host
computers
that
require
shared
access
to
one
or
more
logical
drives.
host
port.
Ports
that
physically
reside
on
the
host
adapters
and
are
automatically
discovered
by
the
DS4000
Storage
Manager
software.
To
give
a
host
computer
access
to
a
partition,
its
associated
host
ports
must
be
defined.
hot
swap.
To
replace
a
hardware
component
without
turning
off
the
system.
hub.
In
a
network,
a
point
at
which
circuits
are
either
connected
or
switched.
For
example,
in
a
star
network,
the
hub
is
the
central
node;
in
a
star/ring
network,
it
is
the
location
of
wiring
concentrators.
IBMSAN
driver.
The
device
driver
that
is
used
in
a
Novell
NetWare
environment
to
provide
multipath
input/output
(I/O)
support
to
the
storage
controller.
IC.
See
integrated
circuit
.
IDE.
See
integrated
drive
electronics
.
in-band.
Transmission
of
management
protocol
over
the
fibre-channel
transport.
Industry
Standard
Architecture
(ISA).
Unofficial
name
for
the
bus
architecture
of
the
IBM
PC/XT
personal
computer.
This
bus
design
included
expansion
slots
for
plugging
in
various
adapter
boards.
Early
versions
had
an
8-bit
data
path,
later
expanded
to
16
bits.
The
″
Extended
Industry
Standard
Architecture
″
(EISA)
further
expanded
the
data
path
to
32
bits.
See
also
Extended
Industry
Standard
Architecture
.
initial
program
load
(IPL).
The
initialization
procedure
that
causes
an
operating
system
to
commence
operation.
Also
referred
to
as
a
system
restart,
system
startup,
and
boot.
integrated
circuit
(IC).
A
microelectronic
semiconductor
device
that
consists
of
many
interconnected
transistors
and
other
components.
ICs
are
constructed
on
a
small
rectangle
cut
from
a
silicon
crystal
or
other
semiconductor
material.
The
small
size
of
these
circuits
allows
high
speed,
low
power
dissipation,
and
reduced
manufacturing
cost
compared
with
board-level
integration.
Also
known
as
a
chip
.
integrated
drive
electronics
(IDE).
A
disk
drive
interface
based
on
the
16-bit
IBM
personal
computer
Industry
Standard
Architecture
(ISA)
in
which
the
controller
electronics
reside
on
the
drive
itself,
eliminating
the
need
for
a
separate
adapter
card.
Also
known
as
an
Advanced
Technology
Attachment
Interface
(ATA).
Internet
Protocol
(IP).
A
protocol
that
routes
data
through
a
network
or
interconnected
networks.
IP
acts
as
an
intermediary
between
the
higher
protocol
layers
and
the
physical
network.
148
IBM
TotalStorage
DS4000
EXP100
Storage
Expansion
Enclosure:
Installation,
User’s
and
Maintenance
Guide
Summary of Contents for TotalStorage EXP100
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