GH


Gigabit Interface Converter (GBIC)

A small hardware device used to adapt an interface to a medium. GBICs allow a port in a router or switch, and a NIC in a host, to be connected to several media via several connectors.



half-duplex

A method of communication in which a device can transmit and receive data but not simultaneously. See also full-duplex.



hardcoded

Encoded into a device by the manufacturer. For example, a device that contains compiled software code (such as BIOS or firmware) might behave a certain way regardless of configuration parameters applied by the device administrator. Such behavior is said to be hardcoded into the device because the behavior cannot be changed.



hard disk

A storage medium and drive mechanism enclosed as a single unit. The medium itself is made of aluminum alloy platters covered with a magnetic substance and anchored at the center to a spindle. Data blocks on a hard disk are accessed randomly. Hard disks provide high capacity, throughput, and reliability relative to floppy disks. Hard disks are classified as permanent media.



hard disk drive

See hard disk.



hard drive

See hard disk.



Hierarchical Storage Management (HSM)

A method of automating data migration between storage mediums that are organized in a hierarchical manner. Primary storage represents the top tier and typically takes the form of relatively expensive, high-performance disk media. Tape media typically constitutes the lowest tier. Many tiers can be defined, and policies are set to initiate migration of data up or down through the hierarchy.



Host Bus Adapter (HBA)

A hardware interface to an open-systems storage network. An HBA is installed in the PCI bus, Sbus, or other expansion bus of a host.



Host Channel Adapter (HCA)

A hardware interface to a mainframe storage network. An HCA is installed in a mainframe.



hot-pluggable

The ability to insert into an electrical device, or remove from it, another electrical device without powering off either device.



HyperText Transfer Protocol (HTTP)

A file-level protocol originally used to access text files across a network. HTTP is now often used for read-only access to files of all types and also can be used for writing to files.






Storage Networking Protocol Fundamentals
Storage Networking Protocol Fundamentals (Vol 2)
ISBN: 1587051605
EAN: 2147483647
Year: 2007
Pages: 196
Authors: James Long

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