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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