HP StorageWorks 2.32 SAN Switch - Manual (Page 327)

Web Tools Version 3.0.x/4.0.x User Guide Glossary–17
Glossary
Half-duplex
A mode of communication that allows a port to either transmit or receive frames at any time,
but not 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.
Hardware Translative Mode
A method for achieving address translation. The following two hardware translative modes are
available to a QuickLoop-enabled switch:
• Standard Translative Mode: Allows public devices to communicate with private devices that
are directly connected to the fabric.
• QuickLoop Mode: Allows initiator devices to communicate with private or public devices
that are not in the same loop.
HBA
Host Bus Adapter. The interface card between a server or workstation bus and the Fibre
Channel network.
High Availability
An attribute of equipment that identifies it as being capable of conducting customer operations
well in excess of 99% of the time. Typically High Availability is identified by the number of
nines in that percentage. “Five Nines” means the equipment is rated as being capable of
conducting customer operations 99.999% of the time without failure.
Host
A computer that accesses storage devices over the fabric. May also be referred to as a server.
See also workstation.
Hot Pluggable
A FRU capability that indicates it may be extracted or installed while customer data is
otherwise flowing in the chassis.
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.