User`s guide

iSR6200 Router Manager
User’s Guide
Glossary-6 ISR654602-00 H
N_Port
Node port. 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 Fibre
Channel fabric switch. See also FL_Port.
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, detec-
tion, 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, such as NL_Port to F_Port to
F_Port to N_Port using a single Fibre
Channel 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 an
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.
network time protocol
See NTP.
non-volatile random access memory
See NVRAM.
NTP
Network time protocol. NTP is used for
distributing the Coordinated Universal
Time (UTC) by means of synchronizing the
clocks of computer systems over
packet-switched, variable-latency data
networks.
NVRAM
Non-volatile random access memory.
NVRAM is a type of memory that retains
data (including configuration settings)
even when power is removed. You can
configure NVRAM settings manually or
restore them from a file.
path
A path to a device is a combination of a
adapter port instance and a target port as
distinct from internal paths in the fabric
network. A fabric network appears to the
operating system as an opaque network
between the adapter (initiator) and the
target.
Because a path is a combination of an
adapter and a target port, it is distinct from
another path if it is accessed through a
different adapter or it is accessing a
different target port. Consequently, when
switching from one path to another, the
driver might select a different adapter (initi-
ator), a different target port, or both.
This selection is important to the driver
when selecting the proper method of
failover notification. It can make a differ-
ence to the target device, which might
have to take different actions when
receiving retries of the request from
another initiator or on a different port.
PCM
Power and cooling module. A device that
consists of one power supply and three
fans.
point-to-point
Also FC-P2P. Two Fibre Channel nodes
directly connected (not in a loop).