I/O
sequential
response
time
The
time
an
I/O
request
is
queued
in
processor
memory
waiting
for
previous
I/Os
to
the
same
volume
to
complete.
IOSQ
See
I/O
sequential
response
time
.
IP
See
Internet
Protocol
.
IPL
See
initial
program
load
.
iSeries
An
IBM
e(logo)server
product
that
emphasizes
integration.
It
is
the
successor
to
the
AS/400
family
of
servers.
J
Java
Virtual
Machine
(JVM)
A
software
implementation
of
a
central
processing
unit
(CPU)
that
runs
compiled
Java
code
(applets
and
applications).
(GC)
JVM
See
Java
Virtual
Machine
.
K
KB
See
kilobyte
.
key
field
The
second
(optional)
field
of
a
count
key
data
record.
The
key
length
is
specified
in
the
count
field.
The
key
length
determines
the
field
length.
The
program
writes
the
data
in
the
key
field
and
uses
the
key
field
to
identify
or
locate
a
given
record.
The
subsystem
does
not
use
the
key
field.
kilobyte
(KB)
1)
For
processor
storage,
real,
and
virtual
storage,
and
channel
volume,
2
10
or
1024
bytes.
2)
For
disk
storage
capacity
and
communications
volume,
1000
bytes.
Korn
shell
Interactive
command
interpreter
and
a
command
programming
language.
KPOH
See
thousands
of
power-on
hours
.
L
LAN
See
local
area
network
.
last-in
first-out
(LIFO)
A
queuing
technique
in
which
the
next
item
to
be
retrieved
is
the
item
most
recently
placed
in
the
queue.
(A)
LBA
See
logical
block
address
.
LCU
See
logical
control
unit
.
least
recently
used
(LRU)
1)
The
algorithm
used
to
identify
and
make
available
the
cache
space
that
contains
the
least-recently
used
data.
2)
A
policy
for
a
caching
algorithm
that
chooses
to
remove
from
cache
the
item
that
has
the
longest
elapsed
time
since
its
last
access.
LED
See
light-emitting
diode
.
LMC
See
licensed
machine
code
.
licensed
machine
code
(LMC)
Microcode
that
IBM
does
not
sell
as
part
of
a
machine,
but
licenses
to
the
customer.
LMC
is
implemented
in
a
part
of
storage
that
is
not
addressable
by
user
programs.
Some
IBM
products
use
it
to
implement
functions
as
an
alternate
to
hard-wired
circuitry.
LIFO
See
last-in
first-out
.
light-emitting
diode
(LED)
A
semiconductor
chip
that
gives
off
visible
or
infrared
light
when
activated.
link
address
On
an
ESCON
interface,
the
portion
of
a
source
or
destination
address
in
a
frame
that
ESCON
uses
to
route
a
frame
through
an
ESCON
director.
ESCON
associates
the
link
address
with
a
specific
switch
port
that
is
on
the
ESCON
director.
Equivalently,
it
associates
the
link
address
with
the
channel
subsystem
or
control
unit
link-level
functions
that
are
attached
to
the
switch
port.
link-level
facility
The
ESCON
hardware
and
logical
functions
of
a
control
unit
or
channel
subsystem
that
allow
communication
over
an
ESCON
write
interface
and
an
ESCON
read
interface.
local
area
network
(LAN)
A
computer
network
located
on
a
user’s
premises
within
a
limited
geographic
area.
local
An
configuration
option
for
storage
servers
that
are
connected
to
a
host-system
network
that
does
not
have
a
domain
name
system
(DNS)
server.
logical
address
On
an
ESCON
interface,
the
portion
of
a
Glossary
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