Qlogic StorageWorks MPX200, Руководство пользователя

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ISR654601-00 D Glossary-5
iSR6200 Command Line Interface (CLI)
User’s Guide
media
Physical-layer information carriers. Fibre
Channel supports several different
physical media: copper, multimode optical,
and single-mode optical. All Fibre Channel
protocols are supported on all media.
MIB
Management information base. A set of
guidelines and definitions for
SNMP
functions.
mid-plane
Located inside the iSR6200 chassis
between the blades and their corre-
sponding
PCM s, the mid-plane connects
the removable power supply and the
iSR6200 blades.
network time protocol
See NTP .
non-volatile random access memory
See NVRAM .
NTP
Network time protocol is used for distrib-
uting 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. 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.
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 and/or it is accessing a
different target port. Consequently, when
switching from one path to another, the
driver might be selecting a different
adapter (initiator), a different target port, or
both.
This is important to the driver when
selecting the proper method of failover
notification. It can make a difference 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).
port
Access points in a device where a link
attaches. There are four types of ports, as
follows:
N_Port is a Fibre Channel port that
supports point-to-point topology.
NL_Port is a Fibre Channel port that
supports loop topology.
FL_Port is a port in a fabric where an
N_Port can attach.