3PAR InFormĀ® OS 2.3.1 Concepts Guide (320-200112 Rev B, February 2010)
GL 7
Glossary
InForm OS Version 2.3.1 3PAR InForm OS Concepts Guide
L
LD
See logical disk.
LD template
Logical disk template. The template contains a
set of logical disk parameters that can be applied
again and again to create logical disks or
volumes with the same characteristics using the
InForm Management Console.
LIP
See loop initialization primitive.
logging
Temporary use of logical disks to store data
during physical disk replacement procedures.
Each controller node has a 20 GB logging logical
disk.
logging LD
Logging logical disk. A RAID 10 logical disk
created during initial system setup and used to
temporarily store data during physical disk
failures and replacement procedures. Each
controller node has a 20 GB logging logical disk.
logical disk
An arrangement of rows of RAID sets. Logical
disks are mapped to virtual volumes.
logical disk backup node
The controller node that takes over for the
logical disk owner node if the logical disk owner
node fails.
logical disk owner node
The controller node that coordinates all transfers
to and from a logical disk, maintains the
mapping information, and coordinates the
recovery of failed physical disks.
logical disk pool
See Common Provisioning Group.
logical unit number
See LUN.
loop initialization primitive (LIP)
The protocol by which a Fibre Channel
Arbitrated Loop (FCAL) network initializes upon
power up or recovers after a failure or other
unexpected condition. During loop initialization,
the nodes present on the arbitrated loop identify
themselves and acquire addresses on the loop.
No data can be transferred on an arbitrated loop
until initialization completes.
LUN
Stands for logical unit number. A number used to
access a virtual volume that has been assigned to
a particular host on a particular port. See also
export, VLUN, and VLUN template.
magazine, mag
See drive magazine.
maintenance PC
A laptop computer running Windows 2000 used
by a field technician to initiate direct
communication with the storage server service
processor and controller nodes.
mapped, mapping
The correspondence of one element in the
system to another element.
master node
See virtual volume master node.
matched-set VLUN template
A rule that allows a particular host connected to
a particular port to see a virtual volume as a
specified LUN. See also VLUN template.