HP StorageWorks HSG60 and HSG80 Array Controller and Array Controller Software Maintenance and Service Guide (EK-G80MS-SA. C01, March 2005)

Glossary
269HP StorageWorks HSG60 and HSG80 Array Controller and Array Controller Software
Maintenance and Service Guide
local connection
A connection to the subsystem, by way of the array 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 and local
terminal.
local terminal
A terminal plugged into the EIA-423 maintenance port located on the front bezel of the array
controller. See also maintenance terminal and local connection.
logical block number
See LBN.
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.
logical unit number
See LUN.
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 array controller. This terminal is used to
identify the array controller, enable host paths, enter configuration information, and check the
array controller status. The maintenance terminal is not required for normal operations. See also
local terminal and local connection.
member
A container that is a storage element in a RAID array.
mirroring
The act of creating an exact copy or image of data.
mirrorset
See RAID-1.
network
A data communication, a configuration in which two or more terminals or devices are
connected to enable information transfer.