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
DS6000
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.
DS6000
See
IBM
TotalStorage
DS6000
.
DS6000
Batch
Configuration
tool
A
program
that
automatically
configures
a
DS6000.
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
.
76
Introduction
and
Planning
Guide
Summary of Contents for System storage DS6000 Series
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