Users Guide

User’s Guide—QLogic Control Suite CLI
45000/41000 Series Adapters and Adapters Based on 578xx Controllers
Doc No. TD-000971 Rev. 1
January 29, 2021 Page 215 Copyright © 2021 Marvell
Layer 2
Refers to the data link layer of the multilay-
ered communication model, Open
Systems Interconnection (OSI). The
function of the data link layer is to move
data across the physical links in a network,
where a switch redirects data messages at
the layer 2 level using the destination MAC
address to determine the message desti-
nation.
LED
Light-emitting diode. Status indicator on a
switch, router, adapter, or other device.
light-emitting diode
See LED.
logical unit number
See LUN.
LUN
Logical unit number, a subdivision of a
SCSI target. It is the small integer handle
that differentiates an individual disk drive
or partition (volume) within a common
SCSI target device such as a disk array.
Technically, a LUN can be a single
physical disk drive, multiple physical disk
drives, or a portion (volume) of a single
physical disk drive. However, LUNs are
typically not entire disk drives but rather
virtual partitions (volumes) of a RAID set.
Using LUNs, the Fibre Channel host can
address multiple peripheral devices that
may share a common controller.
message signaled interrupts
See MSI, MSI-X.
MSI, MSI-X
Message signaled interrupts. One of two
PCI-defined extensions to support
message signaled interrupts (MSIs), in
PCI 2.2 and later and PCI Express. MSIs
are an alternative way of generating an
interrupt through special messages that
allow emulation of a pin assertion or
deassertion.
MSI-X (defined in PCI 3.0) allows a device
to allocate any number of interrupts
between 1 and 2,048 and gives each inter-
rupt separate data and address registers.
Optional features in MSI (64-bit
addressing and interrupt masking) are
mandatory with MSI-X.
N_Port
Node port. A port that connects by a
point-to-point link to either a single N_Port
or a single F_Port. N_Ports handle
creation, detection, and flow of message
units to and from the connected systems.
N_Ports are end ports in virtual
point-to-point links through a fabric, for
example, N_Port to F_Port to F_Port to
N_Port using a single Fibre Channel fabric
switch.
N_Port ID virtualization
See NPIV.
network interface card
See NIC.
NIC
Computer card installed to enable a
dedicated network connection.
NIC partitioning
See NPAR.
node port
See N_Port.