gigabit interface converter (GBIC)
An interface module that converts the light stream from a fibre-channel
cable into electronic signals for use by the network interface card.
gigabyte (GB)
In decimal notation, 1 073 741 824 bytes.
Global Mirror
An asynchronous copy service that enables host data on a particular source
virtual disk (VDisk) to be copied to the target VDisk that is designated in
the relationship.
grain In a FlashCopy bitmap, the unit of data represented by a single bit.
GUI See graphical user interface.
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.
H
hardcoded
Pertaining to software instructions that are statically encoded and not
intended to be altered.
HBA See host bus adapter.
HLUN
See virtual disk.
host An open-systems computer that is connected to the SAN Volume
Controller through a fibre-channel interface.
host bus adapter (HBA)
In SAN Volume Controller, an interface card that connects a host bus, such
as a peripheral component interconnect (PCI) bus, to the storage area
network.
host ID
In SAN Volume Controller, a numeric identifier assigned to a group of host
fibre-channel ports for the purpose of logical unit number (LUN) mapping.
For each host ID, there is a separate mapping of Small Computer System
Interface (SCSI) IDs to virtual disks (VDisks).
host zone
A zone defined in the storage area network (SAN) fabric in which the
hosts can address the SAN Volume Controllers.
hub A fibre-channel device that connects nodes into a logical loop by using a
physical star topology. Hubs will automatically recognize an active node
and insert the node into the loop. A node that fails or is powered off is
automatically removed from the loop.
A communications infrastructure device to which nodes on a multi-point
bus or loop are physically connected. Commonly used in Ethernet and
fibre-channel networks to improve the manageability of physical cables.
Hubs maintain the logical loop topology of the network of which they are
a part, while creating a “hub and spoke” physical star layout. Unlike
170 IBM System Storage SAN Volume Controller: Hardware Installation Guide
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