Brocade Communications Systems A7533A - Brocade 4Gb SAN Switch Base Service-Handbuch

53-1000603-01

19 October 2007

iSCSI Gateway Service

Administrator’s Guide

Supporting Fabric OS v6.0.0

Brocade, the Brocade B weave logo, Fabric OS, File Lifecycle Manager, MyView, Secure Fabric OS, SilkWorm, and StorageX are

registered trademarks and the Brocade B wing logo and Tapestry are trademarks of Brocade Communications Systems, Inc., in

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All other brands, products, or service names are or may be trademarks or service marks of, and are used to identify, products or

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Brocade Communications Systems, Incorporated

Document History

The following table lists all versions of the iSCSI Gateway Service Administrator’s Guide.

Corporate Headquarters

Brocade Communications Systems, Inc.

1745 Technology Drive

San Jose, CA 95110

Tel: 1-408-333-8000

Fax: 1-408-333-8101

Email: info@brocade.com

Asia-Pacific Headquarters

Brocade Communications Singapore Pte. Ltd.

9 Raffles Place

#59-02 Republic Plaza 1

Singapore 048619

Tel: +65-6538-4700

Fax: +65-6538-0302

Email: [email protected]

European and Latin American Headquarters

Brocade Communications Switzerland Sàrl

Centre Swissair

Tour A - 2ème étage

29, Route de l'Aéroport

Case Postale 105

CH-1215 Genève 15

Switzerland

Tel: +41 22 799 56 40

Fax: +41 22 799 56 41

Email: [email protected]

Document Title Publication

Number Summary of Changes Publication Date

iSCSI Gateway Service

Administrator’s Guide

53-1000412-01 First version October 2006

iSCSI Gateway Service

Administrator’s Guide

53-1000440-01 Second version June 2007

iSCSI Gateway Service

Administrator’s Guide

53-1000603-01 Third version October 2007

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Contents

About This Document

Supported hardware and software . . . . . . . . . . . . . . . . . . . . . . . . . . vii

How this document is organized . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii

Document conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . viii

Text formatting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . viii

Notes, cautions, and warnings . . . . . . . . . . . . . . . . . . . . . . . . . . viii

Key terms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix

Additional information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xi

Brocade resources. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xi

Other industry resources. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xii

Optional Brocade features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xii

Getting technical help. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xii

Document feedback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiii

Chapter 1 Introduction to the iSCSI Gateway Service

In this chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Supported iSCSI initiators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Overview of iSCSI gateway service. . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

How iSCSI sessions are translated . . . . . . . . . . . . . . . . . . . . . . . . 3

Presenting FC targets as iSCSI virtual targets . . . . . . . . . . . . . . . 4

Identifying iSCSI components . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Controlling access to the iSCSI VT . . . . . . . . . . . . . . . . . . . . . . . . 6

Switch-to-iSCSI initiator authentication . . . . . . . . . . . . . . . . . . . . 7

Load balancing through connection redirection . . . . . . . . . . . . . 7

Checklist for configuring iSCSI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Chapter 2 Configuring the FC4-16IP Blade

In this chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

FC4-16IP port numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

Enabling the iSCSI gateway service . . . . . . . . . . . . . . . . . . . . . . . . . .13

Enabling the GbE interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

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Configuring the GbE interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Assigning an IP address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Adding static IP routes (optional) . . . . . . . . . . . . . . . . . . . . . . . . 16

Verifying the network connection . . . . . . . . . . . . . . . . . . . . . . . . 16

Adding ARP entries (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Chapter 3 Configuring iSCSI Virtual Targets

In this chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Changing and displaying the IQN Prefix. . . . . . . . . . . . . . . . . . . . . . . 19

Mapping FC targets to iSCSI VTs . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Automatically creating iSCSI Virtual targets. . . . . . . . . . . . . . . .20

Creating iSCSI VTs manually . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Displaying the iSCSI VT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Displaying LUN map configurations . . . . . . . . . . . . . . . . . . . . . . 27

Displaying iSCSI VT state and status . . . . . . . . . . . . . . . . . . . . . 28

Configuring discovery domains . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28

Showing iSCSI initiator IQNs . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Creating discovery domains . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

Configuring discovery domain sets . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Creating a DDSet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Enabling a DDSet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Configuring iSCSI initiator-to-VT authentication . . . . . . . . . . . . . . . . 31

Setting the user name and shared secret . . . . . . . . . . . . . . . . . 31

Configuring iSCSI VT authentication. . . . . . . . . . . . . . . . . . . . . . 31

Binding user names to an iSCSI VT . . . . . . . . . . . . . . . . . . . . . . 32

Deleting user names from an iSCSI VT binding list . . . . . . . . . . 32

Displaying CHAP configurations . . . . . . . . . . . . . . . . . . . . . . . . . 33

Committing the iSCSI-related configuration . . . . . . . . . . . . . . . . . . .33

Displaying current transactions . . . . . . . . . . . . . . . . . . . . . . . . .33

Saving current transactions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Resolving conflicts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Enabling/disabling connection redirection for load balancing . . . .35

LUN masking considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Chapter 4 Creating the iSCSI FC Zone

In this chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Overview of iSCSI FC zoning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

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Creating an iSCSI FC zone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39

Creating a zoning configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43

Chapter 5 Administering the iSNS Client

In this chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Overview of iSNS configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46

Displaying iSNS service status. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Enabling the iSNS client service . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Disabling the iSNS client service . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Clearing the iSNS client configuration. . . . . . . . . . . . . . . . . . . . . . . . 48

Appendix A Scalability Guidelines

Appendix B Troubleshooting

Index

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About This Document

This document is a procedural guide to help SAN administrators configure and manage the iSCSI

gateway service on the FC4-16IP blade in a Brocade 48000 director.

Supported hardware and software

This document is specific to Fabric OS v6.0.0 or higher running on the Brocade 48000 director with

an FC4-16IP blade installed.

In those instances in which procedures or parts of procedures documented here apply to some

switches but not to others, this guide identifies which switches are supported and which are not.

This document sometimes mentions other Fabric OS releases to highlight the changes in the latest

release or to point out interoperability issues with other Brocade models. It also specifies when

procedures or steps of procedures apply only to specific Brocade models.

Although many different software and hardware configurations are tested and supported by

Brocade Communications Systems, Inc. for this Brocade Fabric OS release, documenting all

possible configurations and scenarios is beyond the scope of this document.

How this document is organized

The document contains the following topics:

•Chapter 1, “Introduction to the iSCSI Gateway Service” describes the iSCSI gateway service

supported on the Brocade 48000 director running Fabric OS v6.0.0 or higher with one or more

iSCSI-enabled FC4-16IP blades.

•Chapter 2, “Configuring the FC4-16IP Blade” provides the initial setup steps to deploy an iSCSI

gateway solution.

•Chapter 3, “Configuring iSCSI Virtual Targets” describes how to create iSCSI virtual targets,

discovery domains, discovery domain sets, and how to configure iSCSI VT-iSCSI initiator

authentication.

•Chapter 4, “Creating the iSCSI FC Zone” describes how to create an iSCSI zone for discovery

domains.

•Chapter 5, “Administering the iSNS Client” describes how to enable the iSNS client on an iSCSI

gateway and configure it with an iSNS server.

The appendices provide scalability guidelines and troubleshooting assistance.

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Document conventions

This section describes text formatting conventions and important notices formats.

Text formatting

The narrative-text formatting conventions that are used in this document are as follows:

bold text Identifies command names

Identifies the names of user-manipulated GUI elements

Identifies keywords and operands

Identifies text to enter at the GUI or CLI

italic text Provides emphasis

Identifies variables

Identifies paths and Internet addresses

Identifies document titles

code text Identifies CLI output

Identifies syntax examples

For readability, command names in the narrative portions of this guide are presented in mixed

lettercase: for example, switchShow. In actual examples, command lettercase is often all

lowercase. Otherwise, this manual specifically notes those cases in which a command is case

sensitive. The ficonCupSet and ficonCupShow commands are an exception to this convention.

Notes, cautions, and warnings

The following notices appear in this document.

NOTE

A note provides a tip, emphasizes important information, or provides a reference to related

information.

A caution alerts you to potential damage to hardware, firmware, software, or data.

A warning alerts you to potential danger to personnel.

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Key terms

For definitions of SAN-specific terms, visit the Storage Networking Industry Association online

dictionary at: http://www.snia.org/education/dictionary.

For definitions specific to Brocade and Fibre Channel, see the Brocade Glossary.

The following terms are used in this manual to describe the iSCSI gateway service and its

components.

discovery domain

(DD) A group of iSCSI virtual targets and iSCSI initiators. Discovery domains

are used for access control and authentication. Only the iSCSI initiators in the

same discovery domain as the iSCSI virtual targets can connect to the FC

targets. When there are no discovery domains, all iSCSI initiators can access

all iSCSI virtual targets (and therefore all FC targets) on the gateway.

discovery domain set

(DDSet) A group of discovery domains that can be enabled or disabled. The

set is used to configure access control and authentication models.

FC portal

An FC_Port that connects the iSCSI virtual initiator to the SAN.

iSCSI virtual initiator

(iSCSI VI) Proxies iSCSI initiator connections to iSCSI virtual target with the

physical FC targets on the SAN. Each iSCSI-enable port has one iSCSI virtual

initiator. An iSCSI virtual initiator is similar to an F_Port in the fabric. The iSCSI

VI registers with the Name Server using a symbolic port name (PWWN) and

node name (NWWN).

IQN

(iSCSI Qualified Name) An iSCSI address that uniquely identifies an iSCSI

device on the network. It is the equivalent of a Fibre Channel WWN and is in

human readable form. The iSCSI gateway supports only IQNs and does not

support IEEE, EUI, and IEEE NAA names.

iSCSI initiator

In client/server terminology, a client that connects to a service (iSCSI virtual

target) offered by the server (iSCSI gateway). It is identified by an IQN. The

iSCSI initiator proxies communications between applications and data

located on a remote SCSI devices to allow applications to access data from a

remote SCSI device, such as an FC target across a TCP/IP network.

iSCSI portal

An iSCSI-enabled FC4-16IP GbE port that is assigned an IP address and

connected to the (IP) network. This port receives the iSCSI initiator

connection to the iSCSI virtual target. The port is bound to an iSCSI virtual

initiator that connects to the FC target in the SAN.

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iSCSI portal group

A set of iSCSI-enabled ports. The portal group allows the iSCSI initiator to

access iSCSI virtual targets using any available port. An iSCSI session may

have several connections to an iSCSI VT on any port in the group. Each

FC4-16IP blade has eight GbE ports. The portal group name is the slot

number of the blade. All online iSCSI-enabled GbE ports participate in the

portal group.

iSCSI virtual target

(iSCSI VT) An iSCSI representation of LUNs from one or more FC targets. The

physical FC LUN is mapped to the iSCSI virtual targets. It is identified by an

IQN. The iSCSI gateway proxies the iSCSI initiators connection to the physical

FC targets using iSCSI virtual targets.

iSCSI connection

A single link between an iSCSI initiator and iSCSI target over a TCP/IP network

that carries control messages, SCSI commands, parameters, and data.

iSCSI session

The basic communication “pipe” from an iSCSI initiator to an iSCSI virtual

target. A session is a group of TCP/IP connections that link an iSCSI initiator

with an iSCSI virtual target. Connections can be added or removed from a

session. Sessions are identified by a Session ID (SSID).

iSNS client

Initiates transactions with iSNS servers using the iSNSP, registers device

attribute information in a common discovery domain, downloads information

about other registered clients and receives asynchronous notification of

events that occur in their discovery domains.

iSNS server

Responds to iSNS protocol queries and requests made by iSNS clients using

the iSNSP. iSNS servers initiate iSNSP state change notifications and store

properly authenticated information submitted by a registration request in an

iSNS database.

iSNS database

Both iSCSI initiators and targets can register, and each entity can inquire

about other initiators and targets. For example, a client initiator can obtain

information about target devices from an iSNS server.

LUN mapping

Logic Unit Number mapping. The mapping of the iSCSI virtual target and the

physical FC target.

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