Novell INTERNET STORAGE NAME SERVICE 1.0 -... Manuale utente

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iSNS for Linux Administration Guide

Internet Storage Name Service

1.0

November 14, 2007

NOVELL INTERNET STORAGE NAME

SERVICE ADMINISTRATION GUIDE

novdocx (en) 6 April 2007

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Contents 5

Contents

novdocx (en) 6 April 2007

About This Guide 7

1 iSNS for Linux Overview 9

1.1 How iSNS Works . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

1.2 Benefits of iSNS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

1.3 What's Next . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

2 iSNS for Linux Installation and Setup 11

2.1 Installing iSNS for Linux. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2.2 Setting Up iSNS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2.2.1 Configuring iSCSI Targets and Initiators to Use iSNS. . . . . . . . . . . . . . . . . . . . . . . . 11

2.2.2 Starting iSNS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2.2.3 Creating iSNS Discovery Domains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2.2.4 Creating iSNS Discovery Domain Sets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

2.2.5 Adding iSCSI Nodes to a Discovery Domain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

2.2.6 Adding Discovery Domains to a Discovery Domain Set . . . . . . . . . . . . . . . . . . . . . . 13

2.2.7 Setting Up the iSCSI Initiator to Use the iSNS Server . . . . . . . . . . . . . . . . . . . . . . . 14

A Documentation Updates 15

A.1 November 14, 2007 (Updates) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

A.1.1 Setting Up iSNS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

6iSNS for Linux Administration Guide

novdocx (en) 6 April 2007

About This Guide

novdocx (en) 6 April 2007

About This Guide

This guide includes information on the Novell®Internet Storage Name Service (iSNS) for Linux*,

which provides management of iSCSI target and initiator resources for automatic discovery.

The following topics are included in this documentation:

Chapter 1, “iSNS for Linux Overview,” on page 9

Chapter 2, “iSNS for Linux Installation and Setup,” on page 11

Audience

This guide is intended for intended for anyone involved in installing, configuring, and managing

iSNS.

Feedback

We want to hear your comments and suggestions about this manual and the other documentation

included with this product. Please use the User Comments feature at the bottom of each page of the

online documentation, or go to www.novell.com/documentation/feedback.html and enter your

comments there.

Documentation Updates

The latest version of this iSNS Administration Guide is available on the SLES 10 Documentation

Web site (http://www.novell.com/documentation/sles10/index.html#additional).

Documentation Conventions

In Novell documentation, a greater-than symbol (>) is used to separate actions within a step and

items in a cross-reference path.

A trademark symbol (®, ™, etc.) denotes a Novell trademark. An asterisk (*) denotes a third-party

trademark.

8iSNS for Linux Administration Guide

novdocx (en) 6 April 2007

iSNS for Linux Overview

novdocx (en) 6 April 2007

iSNS for Linux Overview

Storage area networks (SANs) can contain many disk drives that are dispersed across complex

networks. This can make device discovery and device ownership difficult. iSCSI initiators must be

able to identify storage resources in the SAN and determine whether they have access to them.

Internet Storage Name Service (iSNS) is a standards-based service that is available with SUSE

Linux Enterprise Server (SLES) 10 Support Pack 1. iSNS facilitates the automated discovery,

management, and configuration of iSCSI devices on a TCP/IP network. iSNS provides intelligent

storage discovery and management services comparable to those found in Fibre Channel networks.

This overview contains the following sections:

Section 1.1, “How iSNS Works,” on page 9

Section 1.2, “Benefits of iSNS,” on page 10

Section 1.3, “What's Next,” on page 10

1.1 How iSNS Works

For an iSCSI initiator to discover iSCSI targets, it needs to identify which devices in the network are

storage resources and what IP addresses it needs to access them. A query to an iSNS server returns a

list of iSCSI targets and the IP addresses that the initiator has permission to access.

Using iSNS, you create iSNS discovery domains and discovery domain sets. You then group or

organize iSCSI targets and initiators into discovery domains and group the discovery domains into

discovery domain sets. By dividing storage nodes into domains, you can limit the login process of

each host to the most appropriate subset of targets registered with iSNS, which allows the storage

network to scale by reducing the number of unnecessary logins and by limiting the amount of time

each host spends establishing login relationships. This lets you control and simplify the number of

targets and initiators that have access to each other.

Figure 1-1 iSNS Discovery Domains and Discovery Domain Sets

iSNS clients initiate transactions with iSNS servers using the iSNS protocol. They then register

device attribute information in a common discovery domain, download information about other

Discovery

Domain

Set

Discovery

Domain

Target Target TargetInitiator Initiator

Nodes

Target and

Initiator

10 iSNS for Linux Administration Guide

novdocx (en) 6 April 2007

registered clients, and receive asynchronous notification of events that occur in their discovery

domain.

iSNS servers respond to iSNS protocol queries and requests made by iSNS clients using the iSNS

protocol. iSNS servers initiate iSNS protocol state change notifications and store properly

authenticated information submitted by a registration request in an iSNS database.

1.2 Benefits of iSNS

Some of the benefits provided by iSNS for Linux include:

Provides an information facility for registration, discovery, and management of networked

storage assets.

Integrates with the DNS infrastructure

Provides access control for registered targets and initiators

Consolidates registration, discovery, and management of iSCSI storage

Simplifies storage management implementations.

Improves scalability compared to other discovery methods.

An example of the benefits iSNS provides can be better understood through the following scenario:

Suppose you have a company that has 100 iSCSI initiators and 100 iSCSI targets. Depending on

your configuration, all iSCSI initiators could potentially try to discover and connect to any of the

100 iSCSI targets. This could create a discovery and connection nightmare. By grouping initiators

and targets into discovery domains, you can prevent iSCSI initiators in one department from

discovering and connecting to the iSCSI targets in another department. The result is that the iSCSI

initiators in a specific department can only discover those iSCSI targets that are part of the

department’s Discovery Domain.

1.3 What's Next

For information on installing and configuring iSNS, see iSNS for Linux Installation and Setup.

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