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.
Internet
Protocol
(IP)
address.
The
unique
32-bit
address
that
specifies
the
location
of
each
device
or
workstation
on
the
Internet.
For
example,
9.67.97.103
is
an
IP
address.
interrupt
request
(IRQ).
A
type
of
input
found
on
many
processors
that
causes
the
processor
to
suspend
normal
processing
temporarily
and
start
running
an
interrupt
handler
routine.
Some
processors
have
several
interrupt
request
inputs
that
allow
different
priority
interrupts.
IP.
See
Internet
Protocol
.
IPL.
See
initial
program
load
.
IRQ.
See
interrupt
request
.
ISA.
See
Industry
Standard
Architecture
.
Java
Runtime
Environment
(JRE).
A
subset
of
the
Java
Development
Kit
(JDK)
for
end
users
and
developers
who
want
to
redistribute
the
Java
Runtime
Environment
(JRE).
The
JRE
consists
of
the
Java
virtual
machine,
the
Java
Core
Classes,
and
supporting
files.
JRE.
See
Java
Runtime
Environment
.
label.
A
discovered
or
user
entered
property
value
that
is
displayed
underneath
each
device
in
the
Physical
and
Data
Path
maps.
LAN.
See
local
area
network
.
LBA.
See
logical
block
address
.
local
area
network
(LAN).
A
computer
network
located
on
a
user’s
premises
within
a
limited
geographic
area.
logical
block
address
(LBA).
The
address
of
a
logical
block.
Logical
block
addresses
are
typically
used
in
hosts’
I/O
commands.
The
SCSI
disk
command
protocol,
for
example,
uses
logical
block
addresses.
logical
partition
(LPAR).
(1)
A
subset
of
a
single
system
that
contains
resources
(processors,
memory,
and
input/output
devices).
A
logical
partition
operates
as
an
independent
system.
If
hardware
requirements
are
met,
multiple
logical
partitions
can
exist
within
a
system.
(2)
A
fixed-size
portion
of
a
logical
volume.
A
logical
Glossary
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