electrical-to-optical signal conversions for high-speed
networking. A GBIC can be hot swapped. See also
small form-factor pluggable
.
Global Copy.
Refers to a remote logical drive mirror
pair that is set up using asynchronous write mode
without the write consistency group option. This is also
referred to as
″
Asynchronous Mirroring without
Consistency Group.
″
Global Copy does not ensure that
write requests to multiple primary logical drives are
carried out in the same order on the secondary logical
drives as they are on the primary logical drives. If it is
critical that writes to the primary logical drives are
carried out in the same order in the appropriate
secondary logical drives, Global Mirroring should be
used instead of Global Copy. See also
asynchronous
write mode
,
Global Mirroring
,
remote mirroring
,
Metro
Mirroring
.
Global Mirroring.
Refers to a remote logical drive
mirror pair that is set up using asynchronous write mode
with the write consistency group option. This is also
referred to as
″
Asynchronous Mirroring with Consistency
Group.
″
Global Mirroring ensures that write requests to
multiple primary logical drives are carried out in the
same order on the secondary logical drives as they are
on the primary logical drives, preventing data on the
secondary logical drives from becoming inconsistent
with the data on the primary logical drives. See also
asynchronous write mode
,
Global Copy
,
remote
mirroring
,
Metro Mirroring
.
graphical user interface (GUI).
A type of computer
interface that presents a visual metaphor of a real-world
scene, often of a desktop, by combining high-resolution
graphics, pointing devices, menu bars and other menus,
overlapping windows, icons, and the object-action
relationship.
GUI.
See
graphical user interface.
HBA.
See
host bus adapter
.
hdisk.
An AIX term representing a logical unit number
(LUN) on an array.
heterogeneous host environment.
A host system in
which multiple host servers, which use different
operating systems with their own unique disk storage
subsystem settings, connect to the same DS4000
storage subsystem at the same time. See also
host
.
host.
A system that is directly attached to the storage
subsystem through a fibre-channel input/output (I/O)
path. This system is used to serve data (typically in the
form of files) from the storage subsystem. A system can
be both a storage management station and a host
simultaneously.
host bus adapter (HBA).
An interface between the
fibre-channel network and a workstation or server.
host computer.
See
host
.
host group.
An entity in the storage partition topology
that defines a logical collection of host computers that
require shared access to one or more logical drives.
host port.
Ports that physically reside on the host
adapters and are automatically discovered by the
DS4000 Storage Manager software. To give a host
computer access to a partition, its associated host ports
must be defined.
hot swap.
To replace a hardware component without
turning off the system.
hub.
In a network, a point at which circuits are either
connected or switched. For example, in a star network,
the hub is the central node; in a star/ring network, it is
the location of wiring concentrators.
IBMSAN driver.
The device driver that is used in a
Novell NetWare environment to provide multipath
input/output (I/O) support to the storage controller.
IC.
See
integrated circuit
.
IDE.
See
integrated drive electronics
.
in-band.
Transmission of management protocol over
the fibre-channel transport.
Industry Standard Architecture (ISA).
Unofficial
name for the bus architecture of the IBM PC/XT
personal computer. This bus design included expansion
slots for plugging in various adapter boards. Early
versions had an 8-bit data path, later expanded to 16
bits. The
″
Extended Industry Standard Architecture
″
(EISA) further expanded the data path to 32 bits. See
also
Extended Industry Standard Architecture
.
initial program load (IPL).
The initialization procedure
that causes an operating system to commence
operation. Also referred to as a system restart, system
startup, and boot.
integrated circuit (IC).
A microelectronic
semiconductor device that consists of many
interconnected transistors and other components. ICs
are constructed on a small rectangle cut from a silicon
crystal or other semiconductor material. The small size
of these circuits allows high speed, low power
dissipation, and reduced manufacturing cost compared
with board-level integration. Also known as a
chip
.
integrated drive electronics (IDE).
A disk drive
interface based on the 16-bit IBM personal computer
Industry Standard Architecture (ISA) in which the
controller electronics reside on the drive itself,
eliminating the need for a separate adapter card. Also
known as an Advanced Technology Attachment
Interface (ATA).
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IBM System Storage DS5100 and DS5300 Storage Subsystem: Installation, User’s, and Maintenance Guide
