gigabit
interface
converter
(GBIC)
An
interface
module
that
converts
the
light
stream
from
a
fibre-channel
cable
into
electronic
signals
for
use
by
the
network
interface
card.
gigabyte
(GB)
In
decimal
notation,
1
073
741
824
bytes.
Global
Mirror
An
asynchronous
copy
service
that
enables
host
data
on
a
particular
source
virtual
disk
(VDisk)
to
be
copied
to
the
target
VDisk
that
is
designated
in
the
relationship.
grain
In
a
FlashCopy
bitmap,
the
unit
of
data
represented
by
a
single
bit.
GUI
See
graphical
user
interface
.
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.
H
hardcoded
Pertaining
to
software
instructions
that
are
statically
encoded
and
not
intended
to
be
altered.
HBA
See
host
bus
adapter
.
HLUN
See
virtual
disk
.
host
An
open-systems
computer
that
is
connected
to
the
SAN
Volume
Controller
through
a
fibre-channel
interface.
host
bus
adapter
(HBA)
In
SAN
Volume
Controller,
an
interface
card
that
connects
a
host
bus,
such
as
a
peripheral
component
interconnect
(PCI)
bus,
to
the
storage
area
network.
host
ID
In
SAN
Volume
Controller,
a
numeric
identifier
assigned
to
a
group
of
host
fibre-channel
ports
for
the
purpose
of
logical
unit
number
(LUN)
mapping.
For
each
host
ID,
there
is
a
separate
mapping
of
Small
Computer
System
Interface
(SCSI)
IDs
to
virtual
disks
(VDisks).
host
zone
A
zone
defined
in
the
storage
area
network
(SAN)
fabric
in
which
the
hosts
can
address
the
SAN
Volume
Controllers.
hub
A
fibre-channel
device
that
connects
nodes
into
a
logical
loop
by
using
a
physical
star
topology.
Hubs
will
automatically
recognize
an
active
node
and
insert
the
node
into
the
loop.
A
node
that
fails
or
is
powered
off
is
automatically
removed
from
the
loop.
A
communications
infrastructure
device
to
which
nodes
on
a
multi-point
bus
or
loop
are
physically
connected.
Commonly
used
in
Ethernet
and
fibre-channel
networks
to
improve
the
manageability
of
physical
cables.
Hubs
maintain
the
logical
loop
topology
of
the
network
of
which
they
are
a
part,
while
creating
a
“hub
and
spoke”
physical
star
layout.
Unlike
170
IBM
System
Storage
SAN
Volume
Controller:
Hardware
Installation
Guide
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