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. A premium feature for DS4000 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). A transceiver that performs serial,
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
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
host bus adapter (HBA). An interface between the
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.
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
224IBM System Storage DS4700 Express Storage Subsystem: Installation, User’s and Maintenance Guide
