IBM Partner Pavilion DS4100 User Manual
Page 164
auto-volume
transfer/auto-disk
transfer
(AVT/ADT).
A
function
that
provides
automatic
failover
in
case
of
controller
failure
on
a
storage
subsystem.
AVT/ADT.
See
auto-volume
transfer/auto-disk
transfer.
AWT.
See
Abstract
Windowing
Toolkit.
basic
input/output
system
(BIOS).
The
personal
computer
code
that
controls
basic
hardware
operations,
such
as
interactions
with
diskette
drives,
hard
disk
drives,
and
the
keyboard.
BIOS.
See
basic
input/output
system.
BOOTP.
See
bootstrap
protocol.
bootstrap
protocol
(BOOTP).
In
Transmission
Control
Protocol/Internet
Protocol
(TCP/IP)
networking,
an
alternative
protocol
by
which
a
diskless
machine
can
obtain
its
Internet
Protocol
(IP)
address
and
such
configuration
information
as
IP
addresses
of
various
servers
from
a
BOOTP
server.
bridge.
A
storage
area
network
(SAN)
device
that
provides
physical
and
transport
conversion,
such
as
fibre
channel
to
small
computer
system
interface
(SCSI)
bridge.
bridge
group.
A
bridge
and
the
collection
of
devices
connected
to
it.
broadcast.
The
simultaneous
transmission
of
data
to
more
than
one
destination.
cathode
ray
tube
(CRT).
A
display
device
in
which
controlled
electron
beams
are
used
to
display
alphanumeric
or
graphical
data
on
an
electroluminescent
screen.
client.
A
computer
system
or
process
that
requests
a
service
of
another
computer
system
or
process
that
is
typically
referred
to
as
a
server.
Multiple
clients
can
share
access
to
a
common
server.
command.
A
statement
used
to
initiate
an
action
or
start
a
service.
A
command
consists
of
the
command
name
abbreviation,
and
its
parameters
and
flags
if
applicable.
A
command
can
be
issued
by
typing
it
on
a
command
line
or
selecting
it
from
a
menu.
community
string.
The
name
of
a
community
contained
in
each
Simple
Network
Management
Protocol
(SNMP)
message.
concurrent
download.
A
method
of
downloading
and
installing
firmware
that
does
not
require
the
user
to
stop
I/O
to
the
controllers
during
the
process.
CRC.
See
cyclic
redundancy
check.
CRT.
See
cathode
ray
tube.
CRU.
See
customer
replaceable
unit.
customer
replaceable
unit
(CRU).
An
assembly
or
part
that
a
customer
can
replace
in
its
entirety
when
any
of
its
components
fail.
Contrast
with
field
replaceable
unit
(FRU).
cyclic
redundancy
check
(CRC).
(1)
A
redundancy
check
in
which
the
check
key
is
generated
by
a
cyclic
algorithm.
(2)
An
error
detection
technique
performed
at
both
the
sending
and
receiving
stations.
dac.
See
disk
array
controller.
dar.
See
disk
array
router.
DASD.
See
direct
access
storage
device.
default
host
group.
A
logical
collection
of
discovered
host
ports,
defined
host
computers,
and
defined
host
groups
in
the
storage-partition
topology
that
fulfill
the
following
requirements:
v
Are
not
involved
in
specific
logical
drive-to-LUN
mappings
v
Share
access
to
logical
drives
with
default
logical
drive-to-LUN
mappings
device
type.
Identifier
used
to
place
devices
in
the
physical
map,
such
as
the
switch,
hub,
or
storage.
DHCP.
See
Dynamic
Host
Configuration
Protocol.
direct
access
storage
device
(DASD).
A
device
in
which
access
time
is
effectively
independent
of
the
location
of
the
data.
Information
is
entered
and
retrieved
without
reference
to
previously
accessed
data.
(For
example,
a
disk
drive
is
a
DASD,
in
contrast
with
a
tape
drive,
which
stores
data
as
a
linear
sequence.)
DASDs
include
both
fixed
and
removable
storage
devices.
direct
memory
access
(DMA).
The
transfer
of
data
between
memory
and
an
input/output
(I/O)
device
without
processor
intervention.
disk
array
controller
(dac).
A
disk
array
controller
device
that
represents
the
two
controllers
of
an
array.
See
also
disk
array
router.
disk
array
router
(dar).
A
disk
array
router
that
represents
an
entire
array,
including
current
and
deferred
paths
to
all
logical
unit
numbers
(LUNs)
(hdisks
on
AIX).
See
also
disk
array
controller.
DMA.
See
direct
memory
access.
domain.
The
most
significant
byte
in
the
node
port
(N_port)
identifier
for
the
fibre-channel
(FC)
device.
It
is
not
used
in
the
fibre
channel-small
computer
system
interface
(FC-SCSI)
hardware
path
ID.
It
is
required
to
be
the
same
for
all
SCSI
targets
logically
connected
to
an
FC
adapter.
DRAM.
See
dynamic
random
access
memory.
132
IBM
TotalStorage
DS4100
Storage
Server:
Installation,
User’s,
and
Maintenance
Guide