HP 316095-B21 - StorageWorks Edge Switch 2/24 Manual de usuario

glossary

hp StorageWorks

directors and edge switches

Product Version: FW V05.01.00-24/HAFM SW V07.01.00-09

First Edition (June 2003)

Part Number: AA-RU5JA-TE

This glossary defines terms used in manuals that support HP StorageWorks directors

and edge switches.

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Directors and Edge Switches Glossary

First Edition (June 2003)

Part Number: AA-RU5JA-TE

3Directors and Edge Switches Glossary

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 2/16

■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.

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 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.

Glossary

4 Directors and Edge Switches Glossary

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, and unblocked connection.

alias server

Fabric software facility that supports multicast group management.

allowed port connection

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

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.

Glossary

5Directors and Edge Switches Glossary

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.

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, unblocked 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.

bridge

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

communications protocol.

Glossary

6 Directors and Edge Switches Glossary

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.

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.

CHPID

See channel path identifier.

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.

channel

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

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.

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.

Glossary

7Directors and Edge Switches Glossary

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.

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.

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.

Glossary

8 Directors and Edge Switches Glossary

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 capability.

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.

Glossary

9Directors and Edge Switches Glossary

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

default

Pertaining to an attribute, value, or option that is assumed when none is explicitly specified.

default zone

Contains all attached devices that are not members of a separate zone.

destination identifier

Address identifier that indicates the targeted destination of a data frame.

device

Product (server or storage), connected to a managed director, that is not controlled directly by

the Product Manager application. See also node.

diagnostics

Procedures used by computer users and service personnel to diagnose hardware or software

error conditions.

dialog box

Dialog box is a window containing informational messages or data fields to be modified or

filled in with desired options.

D_ID

See destination identifier.

Glossary

10 Directors and Edge Switches Glossary

director

An intelligent Fibre Channel switching device providing any-to-any port connectivity between

nodes (end devices) on a switched fabric. The director sends data transmissions (data frames)

between nodes in accordance with the address information present in the frame headers of those

transmissions.

DNS name

Domain name system (or domain name service). Host or node name for a device or managed

product that is translated to an internet protocol (IP) address through a domain name server.

domain

A Fibre Channel term describing the most significant byte in the node port (N_Port) identifier

for the Fibre Channel device. It is not used in the Fibre Channel small computer system

interface (FC-SCSI) hardware path ID. It is required to be the same for all SCSI targets logically

connected to a Fibre Channel adapter.

domain ID

Number (1 through 31) that uniquely identifies a switch in a multiswitch fabric. A distinct

domain ID is automatically allocated to each switch in the fabric by the principal switch.

domain name service

See DNS name.

dynamic connection

A connection between two ports, established or removed by the directors and, when active,

displays as one continuous link. See also connectivity attribute, blocked connection,

connectivity capability, dynamic connectivity, and unblocked connection.

dynamic connectivity

The capability that allows connections to be established and removed at any time.

E_D_TOV

See error-detect time-out value.

E_Port

See expansion port.

Embedded Web Server

(EWS) — Web-based interface that allows administrators or operators with a browser-capable

PC and Internet connection to monitor and manage a director. The interface provides a GUI

similar to the Product Manager application and supports director configuration, statistics

monitoring, and basic operation.

error-detect time-out value

(E_D_TOV) — User-specified value that defines the time a director or switch waits for an

expected response before declaring an error condition.

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