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SN0054621-00 E Glossary-5
SANsurfer iSCSI HBA CLI User’s Guide
Command Line Interface for QLogic iSCSI Host Bus Adapters
A
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 FC host can address
multiple peripheral devices that may share
a common controller.
LUN masking
A software feature that assigns LUNs to
specific servers or hides LUNs from
specific servers for maximum access and
availability control.
media
Physical-layer information carriers. FC
supports several different physical media:
copper, multimode optical, and
single-mode optical. All FC protocols are
supported on all media.
NPIV
N_Port ID Virtualization.
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, detec-
tion, 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 FC fabric
switch. See FL_Port.
N_Port ID Virtualization
The ability for a single physical FC end
point (N_Port) to support multiple, uniquely
addressable, logical end points. With
NPIV, a host FC adapter is shared in such
a way that each virtual adapter is assigned
to a virtual server and is separately identifi-
able within the fabric. Connectivity and
access privileges within the fabric are
controlled by identification of each virtual
adapter and, hence, the virtual server
using each virtual adapter.
NL_Port (Node Loop Port)
A port capable of arbitrated loop functions
and protocols. An NL_Port connects
through an arbitrated loop to other
NL_Port and at most a single FL_Port.
NL_Ports handle creation, detection, and
flow of message units to and from the
connected systems. NL_Ports are end
ports in virtual point-to-point links through
a fabric, for example NL_Port to F_Port to
F_Port to N_Port using a single FC fabric
switch. In the absence of a fabric switch
FL_Port, NL_Ports can communicate with
other NL_Ports in virtual point-to-point
links through a FC_AL open loop circuit
often through FC_AL (Arbitrated Loop)
hub or loop switch devices. See: E_Port,
F_Port, FL_Port, G_Port, N_Port (Node
Port).
NIC
Network Interface Controller.
NVRAM
Non-volatile random access memory. A
type of memory that retains data even
when power is removed. Holds configura-
tion settings. You can configure NVRAM
settings manually or restore them from a
file. These settings are retained when
power is removed. NVRAM settings are
called HBA parameters in this guide.