3PAR InForm® OS 2.2.4 Concepts Guide (320-200085 Rev B, March 2009)

GL 7
Glossary
InForm OS Version 2.2.4 3PAR InForm OS Concepts Guide
independent electrical circuit
An electrical circuit that does not share a circuit
breaker with another electrical circuit.
initiator, initiator port
A port that is connected to a drive cage. Also
known as a disk port because it sends commands
to the physical disks.
initiator mode
The firmware setting for a port that is connected
to a drive cage.
iSCSI adapter
An iSCSI PCI host bus adapter (HBA) located in a
controller node. The iSCSI adapter connects a
controller node to a host.
iSCSI name
A value used to identify iSCSI channel devices on
an arbitrated loop.
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