HP Array Controller HSG V8.7 Software - Manual (Page 537)

Glossary G–11
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.
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.
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_ID A seven-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.
loop tenancy The period of time between the following events: when a port wins
loop arbitration and when the port returns to a monitoring state.
L_Port A node or fabric port capable of performing Arbitrated Loop functions
and protocols. NL_Ports and FL_Ports are loop-capable ports.
LRU Least recently used. A cache term used to describe the block
replacement policy for read cache.
Mbps Approximately one million (10
6
) bits per second—that is, megabits per
second.
MBps Approximately one million (10
6
) bytes per second—that is, megabytes
per second.
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.
member A container that is a storage element in a RAID array.