Glossary

Hertz

Hz. A unit of frequency equal to one cycle per second.

heterogeneous fabric

A fabric containing open-fabric-compliant products from various vendors. Contrast with homogeneous fabric.

hexadecimal

A numbering system with base of sixteen; valid numbers use the digits 0 through 9 and characters A through F, where A represents 10 and F represents 15 (D).

high availability

A performance feature characterized by hardware component redundancy and concurrent maintenance. High-availability systems maximize system uptime while providing superior reliability, availability, and serviceability.

homogeneous fabric

A fabric consisting of only one vendor’s products. Contrast with heterogeneous fabric.

hop

(1)Data transfer from one node to another node. (2) Describes the number of switches that handle a data frame from its origination point through it’s destination point.

hop count

The number of hops a unit of information traverses in a fabric.

host bus adapter

HBA. Logic card that provides a link between the server and storage subsystem, and that integrates the operating systems and I/O protocols to ensure interoperability.

host processor

(1)A processor that controls all or part of a user application network (T). (2) In a network, the processing unit in which resides the access method for the network (D).

hot pluggable

See concurrent maintenance.

hot spare

See field-replaceable unit.

hot swap

See concurrent maintenance.

hot-swapping

See concurrent maintenance.

HTTP

See hypertext transport protocol.