HP 316095-B21 - StorageWorks Edge Switch 2/24 User manual

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.

© Copyright 2001-2003 Hewlett-Packard Development Company, L.P.
Hewlett-Packard Company makes no warranty of any kind with regard to this material, including, but not limited to,
the implied warranties of merchantability and fitness for a particular purpose. Hewlett-Packard shall not be liable for
errors contained herein or for incidental or consequential damages in connection with the furnishing, performance,
or use of this material.
This document contains proprietary information, which is protected by copyright. No part of this document may be
photocopied, reproduced, or translated into another language without the prior written consent of Hewlett-Packard.
The information contained in this document is subject to change without notice.
Hewlett-Packard Company shall not be liable for technical or editorial errors or omissions contained herein. The
information is provided “as is” without warranty of any kind and is subject to change without notice. The warranties
for Hewlett-Packard Company products are set forth in the express limited warranty statements for such products.
Nothing herein should be construed as constituting an additional warranty.
Printed in the U.S.A.
Directors and Edge Switches Glossary
First Edition (June 2003)
Part Number: AA-RU5JA-TE

3Directors and Edge Switches Glossary
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.