HP StorageWorks HSG80 Array Controller V8.7 Maintenance And Service Manual page 173

Glossary
local terminal
A terminal plugged into the EIA-423 maintenance port located on the front bezel of the
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 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 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 level 1
network
A data communication, a configuration in which two or more terminals or devices are
connected to enable information transfer.
N-m
Newton-meter. The metric equivalent to inch-pounds of torque.
node
In data communications, the point at which one or more functional units connect transmission
lines. In Fibre Channel, a device that has at least one N_Port or NL_Port.
HSG80 Array Controller V8.7 Maintenance and Service Guide Glossary–7