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Brocade SAN Glossary-29
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STORAGE AREA NETWORK Brocade SAN Glossary
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Brocade SAN Glossary 1/31/2008 Page 1 of 29
STORAGE AREA NETWORK
Brocade SAN Glossary
A
ABTS Abort Basic Link Service.
ACC Accept link service reply; the normal reply to an Extended Link Service
request (such as FLOGI), indicating that the request has been completed.
Access fairness A process by which contending nodes are guaranteed access to an
Arbitrated Loop.
Access method The method used to access a physical medium in order to transmit data.
ACK Acknowledgement frame. Used for end-to-end flow control; verifies receipt of
one or more frames from Class 1, 2 or F services.
Active copper A Fibre Channel connection that allows copper cabling up to 33 m (108 ft) in
length between devices.
Adaptive Networking A suite of fabric services introduced in Fabric OS 6.0 that employ deep fabric
intelligence to anticipate congestion and to dynamically make adjustments
in the fabric so that application traffic continues to flow. See also QoS,
Ingress Rate Limiting, and Traffic Isolation.
AD0 A special administrative domain. When an AD-capable switch is first added
to a fabric, all relevant resources of the fabric (switches, ports, devices)
become its members automatically. These resources are put in an implicit
list as defined later. When members are added to AD0 explicitly they become
part of the explicit list as fixed members.
AD255 An administrative domain that allows users to get an unfiltered view of the
fabric and manage ADs. Corresponds to the legacy physical fabric in a non-
AD aware fabric.
AD zone database The zone database owned by each AD. Once Fabric OS 5.2.0 and later is
installed, the root zone database will be owned by AD0, and each AD will
have its own zone database.
Address identifier A 24-bit number used to indicate the link-level address of communicating
devices. In a frame header, the address identifier indicates the source ID
(S_ID) and the destination ID (D_ID) of the frame respectively.
Brocade SAN Glossary 1/31/2008 Page 2 of 29
Administrative Domain (AD)
Part of Brocade’s virtual fabric strategy, a filtered administrative view of the
fabric. The logical view presented in an AD filters attributes of switch ports
and end devices based on AD membership. ADs allow device resources in a
fabric to be grouped together and provide the ability to manage them
separately.
Advanced zoning In EZSwitchSetup, a zoning option that allows you to customize zoning and is
appropriate for SAN administrators who have the experience to perform
manual zoning.
Alias server A proposed standard as part of FC-GS-3; it will use the well-known address
FFFFF8 and will maintain identifier mappings to support multicast group
management
AL_PA Arbitrated Loop Physical Address. An 8-bit value used to identify a device
participating in an Arbitrated Loop.
AL_TIME Arbitrated Loop Timeout value. Twice the amount of time it would take for a
transmission word to propagate around a worst-case loop. The default value
is 15 milliseconds (ms).
ANSI American National Standards Institute. Governing body for standards
in the U.S.
ARB Arbitrative Primitive Signal. Applies only to an Arbitrated Loop topology, and
is transmitted as the fill word by an L_Port to indicate the port is arbitrating
access to the loop.
Arbitrated Loop A shared 100/200-megabytes-per-second Fibre Channel transport
supporting up to a maximum of 126 devices and 1 attachment to a fabric.
Ports with lower AL_PAs have higher priorities.
Arbitration A method of gaining orderly access to a shared-loop topology.
ARP Address Resolution Protocol. A TCP/IP function for associating an IP address
with a link-level address.
ASIC Application-Specific Integrated Circuit.
ATM Asynchronous Transfer Mode. A high-speed packet-switching transport used
for transmitting data over LANs or WANs that transmits fixed-length units of
data. It provides any-to-any connectivity and nodes can transmit
simultaneously.
Audit event Fabric OS event that is logged.
Authentication The process of verifying through a password that an entity in a fabric, such
as a switch, should or should not have access to the fabric.
Autoleveling A process run on embedded switches (also called “blades”) that is triggered
when the active CP detects that the blade contains a different version of the
firmware, regardless of which version is older. Autoleveling downloads the
firmware to the embedded switch, swaps partitions, reboots the switch, and
copies the new firmware from the primary partition to the secondary
partition.
Brocade SAN Glossary 1/31/2008 Page 3 of 29
AW_TOV Arbitration Wait Timeout Value. The minimum time an arbitrating L_Port
waits for a response before beginning loop initialization.
B
Backbone fabric A Fibre Channel fabric that enables scalable metaSANs by allowing the
networking of multiple FC routers connected to the backbone fabric via
E_Port interfaces. Devices attached to Multiprotocol Routers via F_Port or
FL_Port, or imported via the iSCSI Gateway Service, are also considered part
of the backbone.
Bandwidth The transmission capacity of the cable, link, or system.
BB_Credit Buffer-to-buffer credit; used to determine how many frames can be sent to
the recipient.
Beacon A tool in which all of the port LEDs on a switch are set to flash from one side
of the switch to the other to enable identification of an individual switch in a
large fabric.
BER Bit Error Rate. The rate at which bits are expected to be received in error.
Expressed as a ratio of error bits to total bits transmitted.
Bit synchronization The condition is which a receiver is delivering retimed serial data at a
required bit error rate.
Bloom The code name given to the third-generation Brocade 2 Gbit/sec ASIC. This
ASIC is used in Brocade switches 3000 series and beyond.
Broadcast Sending a transmission to all Nx_Ports on a fabric.
Boot code Software that initialized the system environment during the early phase of
the boot up process. For example, boot code may determine the amount of
available memory and how to access it.
Boot flash Flash (temporary) memory that stores the boot code and boot parameters.
Brocade Data Migration Manager (DMM)
Brocade application that provides hardware-assisted data migration from
one storage device to another across a Brocade switch; enables the
migration of data from multiple storage devices simultaneously across
multiple fabrics; layered on the Brocade Storage Application Services (SAS).
Brocade DCX Backbone A backbone-class platform designed to operate at the core of the Brocade
Data Center Fabric (DCF). The Brocade DCX enables massive consolidation,
multi-protocol integration, and simplified management to dramatically
reduce operational and capital costs. It provides true interoperability with
existing SANs. See also Adaptive Networking and data center fabric.
Brocade Fabric Manager (FM)
Optionally licensed Brocade application that resides on a host computer and
enables fabric-wide management for multiple fabrics in a geographically-
dispersed location via a graphical user interface.
Brocade SAN Glossary 1/31/2008 Page 4 of 29
Brocade Enterprise Fabric Connectivity Manager (EFCM)
Optionally licensed Brocade software that provides easy, centralized
management of a SAN and quick access to all device configuration
applications.
Brocade Web Tools Optionally licensed software component of Fabric OS that enables
administrators to monitor and manage single or small fabrics, switches, and
ports from a standard workstation.
Broadcast zone In Fabric OS 5.3.0 or later, a zone with the name of “broadcast” (case-
sensitive), which is used for setting up recipients of broadcast packets. Does
not restrict access to its members, but restricts broadcast packets to only
those devices that are members.
Buffer-to-buffer flow control
Management of the frame transmission rate in either a point-to-point
topology or in an Arbitrated Loop.
Bypass circuitry Circuits that automatically remove a device from the data path when valid
signals are dropped.
C
CAM Content-Addressable Memory.
Cascade Connecting two or more Fibre Channel hubs or switches to increase port
capacity or distance. Seven levels of cascading is the limit for Brocade
switches. Brocade 1000 switches can have up to 32 in a SAN; Brocade
2000 switches and above can have up to 239.
CDR Clock and Data Recovery circuitry.
CE Conformité Européenne.
Channel A point-to-point link whose task is to transport data from one point to
another.
CHAP Challenge-Handshake Authentication Protocol. Allows remote servers and
clients to securely exchange authentication credentials. Both the server and
client are configured with the same shared secret.
CIM Common Information Model; a management structure enabling disparate
resources to be managed by a common application.
Class 1 A connection-oriented class of service that requires acknowledgment of
frame delivery.
Class 2 A connectionless class of service that requires acknowledgment of frame
delivery.
Class 3 A connectionless class of service that requires no acknowledgment of frame
delivery between N_Ports.
Class 4 A connection-oriented service that allows fractional parts of the bandwidth to
be used in a virtual circuit.
Class 6 A connection-oriented, multicast service geared toward video broadcasts
between a central server and clients.
Brocade SAN Glossary 1/31/2008 Page 5 of 29
Class F A connectionless class of service that gives notification of delivery or non-
delivery between E_Ports, used for control, coordination, and configuration
of the fabric.
CLS Close Primitive Signal. Only in an Arbitrated Loop; sent by an L_Port that is
currently communicating on the loop, to close communication to another
L_Port.
Controlled port A port that fulfils one of the following conditions: a) is a member of an AD,
either explicitly assigned or part of AD0 or b) the switch to which the port
belongs is a member of an AD.
Community A relationship in SNMP between an SNMP agent and a set of SNMP
managers that defines authentication, access control, and proxy
characteristics.
Compact flash Flash (temporary) memory that is used in a manner similar to hard disk
storage. It is connected to a bridging component which connects to the PCI
bus of the processor. Not visible within the processor's memory space.
Condor The code name given to the Brocade 4 Gbit/sec ASIC. This ASIC is used in
Brocade switches and directors.
Congestion The realization of the potential of over-subscription. A congested link is one
on which multiple devices actually are contending for bandwidth.
Controller A computer module that interprets signals between a host and a peripheral
device. The controller typically is part of the peripheral device.
Core PID The default PID mode for Brocade 200E, 3016, 3250, 3850, 3900, and
4100 switches and Brocade directors. It uses the entire 8-bit address space
and directly uses the port number as the area_ID.
COS Class of service.
CRC Cyclic Redundancy Check. A self-test for error detection and correction.
Credit A numeric value that represents the maximum number of receive buffers
provided by an F/FL_Port to its attached N/NL_Port such that the N/NL_Port
can transmit frames without overrunning the F/FL_Port.
CRU Customer Replaceable Unit. A component that can, upon failure, be replaced
by an end user.
Cut-through A switching technique that allows a routing decision to be made as soon as
the destination address of the frame is received.
D
D_ID Destination identifier; a 3-byte field in the frame header used to indicate the
address identifier of the N_Port to which the frame is headed.
Dark fiber A leased fiber optic cable running between sites characterized by not having
a service provided on the wire by the leasing company; all services are
provided by the customer.
DAS Direct-Attached Storage.
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