HP StorageWorks HSG80 ACS Solution Software V8.8 for Sun Solaris Installation and Configuration Guide (AA-RV1RA-TE, March 2005)

Glossary
237HSG80 ACS Solution Software V8.8 for Sun Solaris Installation and Configuration Guide
logical unit
number
LUN. 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 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.
LUN See logical unit number.
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.
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 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.
metadata The data written to a disk for the purposes of controller administration.
Metadata improves error detection and media defect management for
the disk drive. It is also used to support storageset configuration and
partitioning. Nontransportable disks also contain metadata to indicate
they are uniquely configured for StorageWorks environments.
Metadata can be thought of as “data about data.”
mirroring The act of creating an exact copy or image of data.