HP StorageWorks HSG60 and HSG80 Array Controller and Array Controller Software Command Line Interface Reference Guide (EK-G80CL-RA. C01, March 2005)

Glossary
325HP StorageWorks HSG60 and HSG80 Array Controller and Array Controller Software
Command Line Interface Reference Guide
local connection
A connection to the subsystem, by way of the controller serial maintenance port, to a
maintenance terminal or the host terminal. A local connection enables you to connect to one
subsystem controller to perform maintenance tasks. See also maintenance terminal; local
terminal.
local terminal
A terminal plugged into the EIA-423 maintenance port located on the front bezel of the
controller. See also maintenance terminal; local connection.
logical bus
A single-ended bus connected to a differential bus by a SCSI bus signal converter.
logical unit
A physical or virtual device addressable through a target ID number. LUNs use their
target’s bus connection to communicate on the SCSI bus. See also unit; LUN.
logical unit number
See LUN
logon
Also called login. A procedure whereby a participant, either a person or network
connection, is identified as being an authorized network participant.
loop
See arbitrated loop.
loop tenancy
The period of time between the following events: a port wins loop arbitration and the port
returns to a monitoring state.
Loop_ID
A 7-bit value numbered contiguously from zero to 126-decimal and represent the 127 legal
AL_PA values on a loop (not all of the 256 hex values are allowed as AL_PA values per
FC-AL).
LUN
Logical Unit Number. A value that identifies a specific logical unit belonging to a SCSI
target ID number. A number associated with a physical device unit during a task’s I/O
operations. Each task in the system must establish its own correspondence between logical
unit numbers and physical devices. See also logical unit.
maintenance terminal
An EIA-423-compatible terminal used with the controller. This terminal is used to identify
the controller, enable host paths, enter configuration information, and check the controller’s
status. The maintenance terminal is not required for normal operations. See also local
terminal; local connection.