HP StorageWorks XPath OS 7.4.X Command Reference Guide (AA-RVHCC-TE, September 2005)

290
GLM Gigabit link module. A semitransparent transceiver that incorporates serializing/deserializing
functions.
GMT Greenwich Mean Time. An international time zone. Also known as UTC.
GUI A graphic user interface, such as Advanced Web Tools and Fabric Manager.
HA High availability. High-availability features are designed to provide maximum reliability and
nondisruptive replacement of key hardware and software modules.
half duplex A mode of communication that allows a port to either transmit or receive frames at any time
except simultaneously (with the exception of link control frames, which can be transmitted at
any time). See also full duplex.
hard address The AL_PA that an NL_Port attempts to acquire during loop initialization.
HBA Host bus adapter. The interface card between a server or workstation bus and the Fibre
Channel network.
HCPLD High-capacity PLD. Refers to both CPLDs and FPGAs.
header A Fibre Channel frame has a header and a payload. The header contains control and
addressing information associated with the frame.
HiPPI High-Performance Parallel Interface. An 800 Mb/s interface normally used in supercomputer
environments.
hop count The number of ISLs a frame must traverse to get from its source to its destination.
host A computer system that provides end users with services like computation and storage access.
hot swappable A hot-swappable component can be replaced under power.
HP StorageWorks The brand name for the HP family of switches.
HSSDC High-speed serial data connection. A form factor that allows quick connections for copper
interface.
HSSDC-2 A second-generation HSSDC connector.
HTTP Hypertext Transfer Protocol. The standard TCP/IP transfer protocol used on the World Wide
Web.
hub A Fibre Channel wiring concentrator that collapses a loop topology into a physical-star
topology. Nodes are automatically added to the loop when active and removed when
inactive.
hunt group A number of N_Ports registered as a single Alias_ID so that the fabric can route a word to a
port that is not busy.
HW Hardware.
I2C Related to internal circuitry on the motherboard.
ICT Intracircuit test.
ID_ID Insistent domain ID. A parameter of the configure command in the Fabric OS.
idle Continuous transmission of an ordered set over a Fibre Channel link when no data is being
transmitted, to keep the link active and maintain bit, byte, and word synchronization.
iFCP Internet Fibre Channel Protocol. Supports Fibre Channel Layer 4 FCP-over-TCP/IP. It is a
gateway-to-gateway protocol in which TCP/IP switching and routing components enhance or
replace Fibre Channel fabric.
in-band Transmission of management protocol over the Fibre Channel.
initiator A server or workstation on a Fibre Channel network that initiates communication with storage
devices. See also target.
intercabinet A specification for copper cabling that allows up to 33-meter distances between cabinets.
intermix Allows any unused bandwidth in a Class 1 connection.
intracabinet A specification for copper cabling that allows up to a 13-meter (42-foot) distance within a
single cabinet.
IOCTL I/O control.