Fibre Channel Protocol (FCP) for small computer
system interface (SCSI). Ahigh-level fibre-channel
mapping layer (FC-4) that uses lower-level fibre-channel
(FC-PH) services to transmit SCSI commands, data,
and status information between a SCSI initiator and a
SCSI target across the FC link by using FC frame and
sequence formats.
field replaceable unit (FRU). An assembly that is
replaced in its entirety when any one of its components
fails. In some cases, a field replaceable unit might
contain other field replaceable units. Contrast with
customer replaceable unit (CRU).
FlashCopy. Apremium feature for the DS5020 that
can make an instantaneous copy of the data in a
volume.
F_port. See fabric port.
FRU. See field replaceable unit.
GBIC. See gigabit interface converter
gigabit interface converter (GBIC). Atransceiver that
performs serial, optical-to-electrical, and
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 applicable
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). Atype 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. AnAIX term representing a logical unit number
(LUN) on an array.
heterogeneous host environment. Ahost system in
which multiple host servers, which use different
operating systems with their own unique disk storage
subsystem settings, connect to the same DS5020
storage subsystem at the same time. See also host.
host. Asystem 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 DS
Storage Manager software. Togive 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″
206 IBM System Storage DS5020 Storage Subsystem: Installation, User’s, and Maintenance Guide