HP 316095-B21 - StorageWorks Edge Switch 2/24 Bedienungsanleitung

Glossary

hp StorageWorks

Directors and Edge Switches

Second Edition (July 2004)

Part Number: AA–RU5JB–TE/623–000005–001

This glossary defines terms used in manuals that support HP StorageWorks Directors and

Edge Switches.

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Directors and Edge Switches Glossary

Second Edition (July 2004)

Part Number: AA–RU5JB–TE/623–000005–001

3Directors and Edge Switches Glossary

Glossary

This glossary defines terms used in manuals that support the following HP

StorageWorks storage area network (SAN) products:

■Director 2/64

■Director 2/140

■Edge Switch 2/12

■Edge Switch 2/16

■Edge Switch 2/24

■Edge Switch 2/32

The glossary includes terms that relate specifically to the supported products. It

does not include many terms that are generally well-known in the SAN industry.

10BaseT

An implementation of the IEEE Ethernet standard for 24-gauge unshielded twisted-pair wiring,

using a baseband transmission rate of ten Mbps.

100BaseT

An implementation of the IEEE Ethernet standard for 24-gauge unshielded twisted-pair wiring,

using a baseband transmission rate of 100 Mbps.

access control

Method of control (with associated permissions) by which a set of devices can access other

devices across a network. See also persistent binding and zoning.

active configuration

In S/390 mode, the director or switch configuration that is determined by the status of the

connectivity attributes.

active FBML

The active fabric binding membership list. When fabric binding is active, the list of fabric

members with which the product is allowed to communicate. See fabric binding and fabric

binding membership list.

Glossary

4 Directors and Edge Switches Glossary

active FRU

A redundant field-replaceable unit that is currently operating as the active and not the backup

FRU. See also backup FRU.

active port address matrix

In S/390 mode, an active port address matrix is the port address matrix that is currently active or

operational on an attached director or switch. See also connectivity capability.

active zone set

Single zone set that is active in a multiswitch fabric. It is created when you enable a specified

zone set. This zone set is compiled by checking for undefined zones or aliases.

address name

See port name.

agent

Software that processes queries on behalf of an application and returns replies.

alarm

Simple network management protocol (SNMP) message notifying an operator of a network or

device problem.

allowed connection

In S/390 mode in a director or switch, the attribute that, when set, establishes dynamic

connectivity capability. See also blocked connection, connectivity attribute, dynamic

connectivity.

alias server

Fabric software facility that supports multicast group management.

allowed port connection

In S/390 mode, this attribute establishes dynamic connectivity capability.

American National Standard Code for Information Interchange

ASCII. A standard character set consisting of 7-bit coded characters (8-bit including parity

check) used for information exchange between systems and equipment.

American National Standards Institute

ANSI. A national organization consisting of producers, consumers, and general interest groups

that establishes procedures by which accredited organizations create and maintain industry

standards in the United States

application program interface

API. A set of programming functions and routines that provides access between protocol layers,

such as between an application and network services.

Glossary

5Directors and Edge Switches Glossary

application-specific integrated circuit

ASIC. An asynchronous transfer mode (ATM) local area network/ wide area network

(LAN/WAN) circuit using cell relay transport technology. ASICs are designed for a specific

application or purpose, such as implementing the lower-layer Fibre Channel protocol (FC-0).

They are particularly suited to sending video and audio information, as well as text. ASICs

differ from general-purpose devices such as memory chips or microprocessors.

area

The second byte of the node port (N_Port) identifier.

arbitrated loop

One of the three connection topologies offered by Fibre Channel protocol. Up to 126 node ports

and one fabric port can communicate without the need for a separate switched fabric.

arbitrated loop physical address

(AL_PA) — A 1-byte value used in the arbitrated loop topology that identifies loop ports

(L_Ports). This value then becomes the last byte of the address identified for each public L_Port

on the loop.

arbitration

Process of choosing one device from a collection of devices that request service simultaneously.

attribute

In S/390 mode, the connection status of the address on a configuration matrix: allowed,

blocked, or prohibited.

audit log

Log summarizing actions (audit trail) made by the user.

authentication

Verification of identity for a person or process.

backbone

Cable on which two or more stations or networks may be attached, typically used to link

computer networks at one site with those at another. Smaller branch networks are sometimes

called ribs.

backplane

The backplane provides 48 VDC power distribution and connections for all logic cards.

backup FRU

When an active field-replaceable unit (FRU) fails, an identical backup FRU takes over

operation automatically (failover) to maintain director and Fibre Channel link operation. See

also active FRU.

bandwidth

(1) The difference (expressed in Hertz) between the highest and lowest frequencies in a range of

frequencies. (2) The data transfer rate of a network or electronic communication system.

Glossary

6 Directors and Edge Switches Glossary

BB_Credit

See buffer-to-buffer credit.

beaconing

Use of light-emitting diodes on ports, port cards, field-replaceable units, and directors to aid in

the fault-isolation process. When enabled, active beaconing causes LEDs to flash for selected

components.

BER

See bit error rate.

bezel

A removable panel that covers empty drive bays and port cards.

bidirectional

In Fibre Channel, the capability to simultaneously communicate at maximum speeds

(100 Mbps) in both directions over a link.

bit error rate

(BER) — Ratio of received bits that contain errors to total of all bits transmitted.

blocked connection

In S/390 mode, in a director or switch, the attribute that, when set, removes the communication

capability of a specific port. A blocked address is disabled so that no other address can be

connected to it. A blocked attribute supersedes a dedicated or prohibited attribute on the same

address. See also allowed connection, connectivity attribute, dynamic connection, and dynamic

connectivity.

blocked port

Devices communicating with the port are prevented from logging into the director or

communicating with other devices attached to the director. A blocked port continuously

transmits the offline sequence.

B_Port

See bridge port.

bridge

Device that connects and passes packets between two network segments that use the same

communications protocol.

bridge port

(B_Port) — (1) In Fibre Channel protocol, a fabric inter-element port used to connect bridge

devices with E_Ports on a switch. B_Ports provide a subset of E_Port functionality. (2) A term

for a physical interface between the fabric (switch) and a bridge device. The interface is

identical to an expansion port (E_Port), but it does not participate in full expansion port

protocols. As such, it does not assign domain IDs or participate in routing protocol. See also

expansion port, fabric port, generic port, node port, and segmented E_Port.

Glossary

7Directors and Edge Switches Glossary

broadcast

Send a transmission to all node ports (N_Ports) on a fabric. See also broadcast frame and

multicast.

broadcast frame

Data packet, also known as a broadcast packet, whose destination address specifies all

computers on a network. See also broadcast and multicast.

buffer

Storage area for data in transit. Buffers compensate for differences in processing speeds

between devices. See also buffer-to-buffer credit

buffer-to-buffer credit

(BB_Credit) — The maximum number of frames a port can transmit without receiving a receive

ready signal from the receiving device.

bypassed port

If a port is bypassed, all serial channel signals route past the port. A device attached to the port

cannot communicate with other devices in the loop.

cascade

Linking two or more Fibre Channel switches to form a larger switch or fabric. The switched

link through fiber cables attached between one or more expansion ports (E_Ports). See also

expansion port.

call-home

Product feature that requires installation of HP Proactive Service software and enables the

HAFM server to automatically transmit system events (failure information) to aN HP customer

support center. The HP support center server accepts calls from the HAFM server, logs reported

events, and can notify one or more support center representatives.

cell

In S/390 mode, in a port address matrix, a cell is the intersection point between a horizontal port

address and a vertical port address. A selected cell is indicated by the cell cursor.

chained

Two directors or switches that are physically attached.

channel

Point-to-point link that transports data from one point to the other.

channel-attached

(1) Pertaining to direct attachment of devices by data I/O channels to a computer. (2) Pertaining

to devices attached to a control unit by cables, not telecommunication lines.

channel path

A single interface between a central processor and one or more control units along which

signals and data can be sent to perform I/O requests.

Glossary

8 Directors and Edge Switches Glossary

channel path identifier

(CHPID) — In a channel subsystem, a value assigned to each installed channel path of the

system that uniquely identifies that path to the system.

channel-to-channel

CTC. A channel attached to another channel (channel-to-channel) and specifies the I/O mode of

operation for the channel path under the I/O configuration program (IOCP) channel path

identifier (CHPID) statement ‘Type’ parameter. See also channel path identifier.

channel wrap test

A diagnostic procedure that checks S/390 host-to-director connectivity by returning the output

of the host as input. The test is host-initiated, and transmits Fibre Channel frames to a director

port. A director port enabled for channel wrapping echoes the frame back to the host.

CHPID

See channel path identifier.

Class 2 Fibre Channel service

Provides a connectionless (not dedicated) service with notification of delivery or nondelivery

between two N_Ports. In-order delivery of frames is not guaranteed.

Class 3 Fibre Channel service

Provides a connectionless (not dedicated) service without notification of delivery or

nondelivery between two N_Ports. Also known as datagram.

Class F Fibre Channel service

Used by switches to communicate across interswitch links (ISLs) to configure, control, and

coordinate a multiswitch fabric.

class of Fibre Channel service

Defines the level of connection dedication, acknowledgment, and other characteristics of a

connection. Class 2, Class 3, and Class F services are supported.

client/server computing

Architectural model that functionally divides that execution of a unit of work between activities

initiated by an end user or program (client) and those maintaining data (servers). Originally

thought to make mainframes obsolete.

cluster

A group of processors interconnected by a high-speed network (typically dedicated) for

increased reliability and scalability. Clusters are groupings of multiple servers in which

information is shared among systems. When a server in a cluster fails, one of the other servers

in the cluster assumes the responsibility of the failed server, thereby ensuring server,

application, and data availability.

Glossary

9Directors and Edge Switches Glossary

community name (SNMP)

A name that represents a simple network management protocol (SNMP) community that the

agent software recognizes as a valid source for SNMP requests. A product recognizes a

management station as a valid recipient for trap information when the station’s community

names are configured.

community profile

Information that specifies which management objects are available to what management

domain or SNMP community name.

concurrent firmware upgrade

Firmware is upgraded without disrupting switch operation.

concurrent maintenance

Ability to perform maintenance tasks, such as removal or replacement of field-replaceable units

(FRUs), while normal operations continue without interruption. See also nondisruptive

maintenance.

configuration data

Configuration data includes identification data, port configuration data, operating parameters,

SNMP configuration, and zoning configuration. A configuration backup file is required to

restore configuration data if the control processor (CTP) card in a nonredundant director is

removed and replaced.

connectionless

Nondedicated link. Typically used to describe a link between nodes that allows the switch to

forward Class 2 or Class 3 frames as resources (ports) allow. Contrast this type of link to the

dedicated bandwidth that is required in a Class 1 Fibre Channel Service point-to-point link.

connectivity attribute

In S/390 mode, the characteristic that determines port address status for the director or switch.

See also allowed connection, blocked connection, connectivity capability, connectivity control,

dynamic connection, dynamic connectivity, and unblocked connection.

connectivity capability

(1) The capability that allows attachment of a device to a system without requiring physical

reconfiguration of either the device or the interconnections. (2) The director or switch capability

that allows logical manipulation of link connections to provide physical device attachment. See

also active port address matrix, connectivity attribute, and connectivity control.

connectivity control

In S/390 mode, in a director or switch, the method used to change port address connectivity

attributes and determine the communication capability of the link attached to the port. See also

active port address matrix, connectivity attribute, and connectivity control.

Glossary

10 Directors and Edge Switches Glossary

connector

See optical fiber connector.

control processor card

(CTP card) — Circuit card that contains the director microprocessor. The CTP card also

initializes hardware components of the system after power-on. A 10 Mbps RJ-45 twisted pair

connector is located on the CTP card to connect to an Ethernet LAN and communicate with the

HAFM server or a specific management station.

control unit

A device that controls the reading, writing, or displaying of data at one or more input/output

units.

control unit port

An internal director port on the CTP card that communicates with the attached IBM S/390 or

similar processor channels to report error conditions and link initialization.

CRC

See cyclic redundancy check.

CTP card

See control processor card.

CUP

See control unit port.

cyclic redundancy check

(CRC) — System of error checking performed at both the sending and receiving station using

the value of a particular character generated by a cyclic algorithm. When the values generated at

each station are identical, data integrity is confirmed.

DASD

Direct access storage device, such as a disk drive.

datagram

See Class 3 Fibre Channel service.

data directory

Directory that contains critical information for all managed products (including directors and

switches). Information stored here includes:

■All configuration data

■All log files

■Call-home settings

■Firmware library

■Zoning library

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