User Manual

Glossary
221Enterprise Virtual Array 3000 User Guide
loop
See arbitrated loop.
loop ID
Seven-bit values numbered contiguously from 0 to 126 decimal and represent the 127 valid
AL_PA values on a loop (not all 256 hexadecimal values are allowed as AL_PA values per
FC–AL).
loop pair
A Fibre Channel attachment between a controller and physical disk drives. Physical disk
drives connect to controllers through paired Fibre Channel arbitrated loops. There is a single
loop pair, designated loop pair 1. Each loop pair consists of two loops (called loop A and loop
B) that operate independently during normal operation, but provide mutual backup in case one
loop fails.
LTEA
Last Termination Event Array. A two-digit HSV Controller number that identifies a specific
event that terminated an operation. Valid numbers range from 00 to 31.
LUN
Logical Unit Number. A SCSI convention used to identify elements. The host sees a virtual
disk as a LUN. The LUN address a user assigns to a virtual disk for a particular host will be
the LUN at which that host will see the virtual disk.
management agent
The Command View EVA software that controls and monitors the Enterprise Storage System.
The software can exist on more than one management appliance in a fabric. Each installation
of the Command View EVA software is a management agent.
management agent
event
Significant occurrence to or within the management agent software, or an initialized storage
cell controlled or monitored by the management agent.
Mb
Megabit. A term defining a data transfer rate.
See also Mbps.
MB
Megabtye. A term defining either:
■ A measure of either storage or memory capacity of 1,048,576 (2
20
) bytes.
■ A data transfer rate.
See also MBps.