Dell PowerVault NX3000 Guida di riferimento rapido

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Dell™ PowerVault™

Network Attached Storage

(NAS) Solution

iSCSI Deployment Guide

Notes, Cautions, and Warnings

NOTE: A NOTE indicates important information that helps you make better use of

your computer.

CAUTION: A CAUTION indicates potential damage to hardware or loss of data if

instructions are not followed.

WARNING: A WARNING indicates a potential for property damage, personal

injury, or death.

____________________

Information in this document is subject to change without notice.

ReproductionofthesematerialsinanymannerwhatsoeverwithoutthewrittenpermissionofDellInc.

is strictly forbidden.

Trademarks used in this text: Dell, the DELL logo, and PowerVault are trademarks of Dell Inc.;

Microsoft, Windows,and Windows Server are either trademarks or registered trademarks of Microsoft

Corporation in the United States and/or other countries.

Other trademarks and trade names may be used in this document to refer to either the entities claiming

the marks and names or their products. Dell Inc. disclaims any proprietary interest in trademarks and

trade names other than its own.

May 2009 Rev. A00

Contents 3

Contents

1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . 7

Terms and Definitions . . . . . . . . . . . . . . . . . . . 8

PowerVault Storage System . . . . . . . . . . . . . 8

iSCSI . . . . . . . . . . . . . . . . . . . . . . . . . 8

iSNS. . . . . . . . . . . . . . . . . . . . . . . . . . 8

Before Setting Up the PowerVault Storage Solution as

an iSCSI Target. . . . . . . . . . . . . . . . . . . . . . . 9

Best Practices for Setting Up the iSCSI Storage

Area Network. . . . . . . . . . . . . . . . . . . . . 9

2 Setup Steps for Initiator-Target

Connection . . . . . . . . . . . . . . . . . . . . . . . 13

Pre-Requisites . . . . . . . . . . . . . . . . . . . 13

Method 1 (Discovery Using Target Portals) . . . . . . . 13

Configuring the Initiator (Host) . . . . . . . . . . . 14

Configuring iSCSI Connection With the PowerVault

NAS Storage System . . . . . . . . . . . . . . . . 14

Creating the Target . . . . . . . . . . . . . . . . . 14

Creating a Virtual Disk . . . . . . . . . . . . . . . 16

Log on - Configuring the Initiator-Target Connection

From Initiator (Host) . . . . . . . . . . . . . . . . 17

Method 2 (Discovery Using iSNS Server) . . . . . . . . 18

Pre-Requisites . . . . . . . . . . . . . . . . . . . 18

Configuring Settings From the Initiator . . . . . . 18

4Contents

3 Target Details . . . . . . . . . . . . . . . . . . . . 21

Setting Up Target IP Addresses in the PowerVault™

NAS Storage Solution . . . . . . . . . . . . . . . . . . 21

Configuring Microsoft®iSCSI Software Targets . . 21

Configuring iSCSI LUNs. . . . . . . . . . . . . . . 26

Multiple Sessions . . . . . . . . . . . . . . . . . . 27

iSCSI Snapshots . . . . . . . . . . . . . . . . . . 27

Disconnecting/Cleaning Up iSCSI Devices . . . . . . . 32

From Initiator . . . . . . . . . . . . . . . . . . . . 32

From Target . . . . . . . . . . . . . . . . . . . . . 32

4 Configuring Secured iSCSI Connections

Using Challenge-Handshake

Authentication Protocol . . . . . . . . . . . . . 35

CHAP vs IPSec . . . . . . . . . . . . . . . . . . . . . . 36

One-Way CHAP Authentication . . . . . . . . . . . . . 36

iSCSI Target Settings . . . . . . . . . . . . . . . . 36

iSCSI Initiator Settings . . . . . . . . . . . . . . . 37

Mutual CHAP Authentication . . . . . . . . . . . . . . 37

Initiator Settings . . . . . . . . . . . . . . . . . . 37

Target Settings . . . . . . . . . . . . . . . . . . . 38

Initiator Settings Continued. . . . . . . . . . . . . 38

A Appendix . . . . . . . . . . . . . . . . . . . . . . . . 39

Initiator Details. . . . . . . . . . . . . . . . . . . . . . 39

General Tab . . . . . . . . . . . . . . . . . . . . . 39

Discovery Tab . . . . . . . . . . . . . . . . . . . . 40

Targets Tab . . . . . . . . . . . . . . . . . . . . . 42

Contents 5

Advanced Configuration Details . . . . . . . . . . . . 45

Enabling Multi-Path on the Initiator . . . . . . . . 45

Using the Advanced Option . . . . . . . . . . . . 46

Verifying the Properties of the Targets that

are Connected . . . . . . . . . . . . . . . . . . . 46

Installing and Configuring iSNS Server . . . . . . . . . 48

Configuring the iSNS Server . . . . . . . . . . . . 49

Best Practices for Efficient Storage Management . . . 50

Storage Manager for SANs . . . . . . . . . . . . 50

LUN Management for iSCSI Subsystems. . . . . . 50

Known Issues . . . . . . . . . . . . . . . . . . . . . . 51

6Contents

Introduction 7

Introduction

This document provides information about configuring the

Internet Small Computer System Interface (iSCSI) Software Target on the

Dell™ PowerVault™ storage system as a block storage device.

iSCSI is a useful and relatively inexpensive way to provide storage for new

applications or to provide a network pool of storage for existing applications.

Dell and its storage partners provide a variety of storage solutions that can be

implemented easily. This document allows administrators and IT managers to

explore iSCSI technology and see actual deployment examples.

The following topics are discussed in the document:

• Quick install steps—Provides instructions about creating an iSCSI Target

and establishing connection with a Microsoft

iSCSI Initiator

• End-to-end iSCSI configuration:

– Detailed instructions on installing and configuring the Microsoft

iSCSI Initiator software and the Microsoft iSCSI Software Target

– Configuring the Initiator-Target connections

• Setting up secure iSCSI connections

• Microsoft iSNS server and other advanced configuration details

NOTE: In this document the iSCSI Initiator is referred to as the Initiator and the

iSCSI Software Target is referred to as the Target.

8Introduction

Terms and Definitions

The following sections describe the terms used in this document.

PowerVault Storage System

Throughout this document, the term PowerVault storage system refers to the

individual storage unit. The term PowerVault storage solution refers to the

configuration of the server separately or together with the storage arrays.

iSCSI

iSCSI is a standard that carries SCSI commands through Transfer Control

Protocol/Internet Protocol (TCP/IP)—a protocol that enables transport of

block data over IP networks, without the need for a specialized network

infrastructure, such as Fibre Channel.

In the context of system storage, iSCSI enables any client/machine (Initiator)

on an IP network to contact a remote dedicated server (Target) and perform

block I/O on it just as it would perform on a local hard disk.

iSNS

Microsoft iSCSI Internet Storage Name Service (iSNS) is a service that

processes iSNS registrations, deregistrations, and queries through TCP/IP from

iSNS clients and also maintains a database of these registrations (similar to a

DNS server). A common use for Microsoft iSNS server is to allow iSNS clients

(Initiators and Targets) to register themselves and to query for other registered

iSNS clients. Registrations and queries are transacted remotely over TCP/IP.

You can download and install the iSNS server from the Microsoft Support

website at support.microsoft.com on a separate server that does not have

Microsoft iSCSI Initiator or Target installed.

NOTE: For details about installing and configuring the iSNS server, see "Appendix"

on page 39.

Introduction 9

Before Setting Up the PowerVault Storage

Solution as an iSCSI Target

Before you set up your storage solution as an iSCSI Target, read this section

completely. You must consider features such as Ethernet settings and security

settings for iSCSI Targets.

Best Practices for Setting Up the iSCSI Storage Area Network

Table 1-1 provides information about configuring NICs (on Target) in

different models of iSCSI networks.

• You can configure redundant paths on Initiator (hosts). Microsoft

Multipath I/O (MPIO) is supported with Initiator version of 2.06 or later.

• You require two dedicated iSCSI NICs on the Target and Initiator for

efficient MPIO connection in the PowerVault storage solution.

• iSCSI NIC teaming is not supported.

• You can configure Initiators with one or two dedicated NICs for iSCSI

based on your requirement.

NOTE: Table 1-1 provides information about the iSCSI Target NIC

configuration. The optimal connection information is also provided as options.

You can configure the iSCSI NICs according to your network requirements.

Table 1-1. Using a Single PowerVault Storage Solution as a Target

Number of NICs Details Refer to Figure

4 NIC-1 and NIC-2 - Teamed NICs for public

network

NIC-3 - iSCSI dedicated traffic (subnet A)

NIC-4 - iSCSI dedicated traffic (subnet B)

Figure 1-1

NOTE: Use this

configuration if iSCSI

traffic has more

priority than file traffic.

NIC-1 - NIC for public Network

NIC-2 - iSCSI dedicated traffic (subnet A)

NIC-3 - iSCSI dedicated traffic (subnet B)

Figure 1-2

10 Introduction

• It is a good practice to have two ports dedicated for iSCSI. Configure each

NIC (or ports if you have a multiport NIC) on a separate subnet.

• Secured iSCSI is possible with Challenge-Handshake Authentication

Protocol (CHAP). For more information about CHAP settings, see

"Configuring Secured iSCSI Connections Using Challenge-Handshake

Authentication Protocol" on page 35.

Table 1-2. Worksheet

NOTE: IQNs are the standard naming convention for identifying Targets and

Initiators and it is recommended that you use IQN as the identifier whenever

possible.

NOTE: It is recommended that you configure dedicated iSCSI NICs on

separate subnets and not on the public network.

Options Host IP Target IP

NIC 1

iSCSI

Public

Other

NIC 2

iSCSI

Public

Other

NIC 3

iSCSI

Public

Other

NIC 4

iSCSI

Public

Other

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