IBM TOTAL STORAGE DS8000 User Manual
Page 352
disk
cage
A
container
for
disk
drives.
Each
disk
cage
supports
eight
disk
packs
(64
disks).
disk
drive
Standard
term
for
a
disk-based
nonvolatile
storage
medium.
The
DS8000
uses
hard
disk
drives
as
the
primary
nonvolatile
storage
media
to
store
host
data.
disk
drive
module
(DDM)
A
field
replaceable
unit
that
consists
of
a
single
disk
drive
and
its
associated
packaging.
disk
drive
module
group
See
disk
pack.
disk
pack
A
group
of
disk
drive
modules
(DDMs)
installed
as
a
unit
in
a
DDM
bay.
disk
group
A
collection
of
4
disk
drives
that
are
connected
to
the
same
pair
of
IBM
Serial
Storage
adapters
and
can
be
used
to
create
a
RAID
array.
A
disk
group
can
be
formatted
as
count
key
data
or
fixed
block,
and
as
RAID
or
non-RAID,
or
it
can
be
left
unformatted.
A
disk
group
is
a
logical
assemblage
of
disk
drives.
Contrast
with
disk
pack.
distributed
file
service
(DFS)
A
service
that
provides
data
access
over
IP
networks.
DNS
See
domain
name
system.
domain
1)
That
part
of
a
computer
network
in
which
the
data
processing
resources
are
under
common
control.
2)
In
TCP/IP,
the
naming
system
used
in
hierarchical
networks.
3)
A
Copy
Services
server
group,
in
other
words,
the
set
of
clusters
the
user
designates
to
be
managed
by
a
particular
Copy
Services
server.
domain
name
system
(DNS)
In
TCP/IP,
the
server
program
that
supplies
name-to-address
translation
by
mapping
domain
names
to
internet
addresses.
The
address
of
a
DNS
server
is
the
internet
address
of
the
server
that
hosts
the
DNS
software
for
the
network.
dotted
decimal
notation
A
convention
used
to
identify
IP
addresses.
The
notation
consists
of
four
8-bit
numbers
written
in
base
10.
For
example,
9.113.76.250
is
an
IP
address
that
contains
the
octets
9,
113,
76,
and
250.
drawer
A
unit
that
contains
multiple
device
drive
modules
and
provides
power,
cooling,
and
related
interconnection
logic
to
make
the
device
drive
modules
accessible
to
attached
host
systems.
drive
1)
A
peripheral
device,
especially
one
that
has
addressed
storage
media.
See
also
disk
drive
module.
2)
The
mechanism
used
to
seek,
read,
and
write
information
on
a
storage
medium.
DS8000
See
IBM
TotalStorage
DS8000.
DS8000
Batch
Configuration
tool
A
program
that
automatically
configures
a
DS8000.
The
configuration
is
based
on
data
that
IBM
service
personnel
enter
into
the
program.
DS
Storage
Manager
See
IBM
TotalStorage
DS
Storage
Manager.
duplex
1)
Regarding
Copy
Services,
the
state
of
a
volume
pair
after
Remote
Mirror
and
Copy
has
completed
the
copy
operation
and
the
volume
pair
is
synchronized.
2)
In
general,
pertaining
to
a
communication
mode
in
which
data
can
be
sent
and
received
at
the
same
time.
dynamic
sparing
The
ability
of
a
storage
server
to
move
data
from
a
failing
disk
drive
module
(DDM)
to
a
spare
DDM
while
maintaining
storage
functions.
E
E10
The
predecessor
of
the
F10
model
of
the
Enterprise
Storage
Server.
See
also
F10.
E20
The
predecessor
of
the
F20
model
of
the
Enterprise
Storage
Server.
See
also
F20.
EBCDIC
See
extended
binary-coded
decimal
interchange
code.
332
IBM
TotalStorage
DS8000:
Messages
Reference