Dell PowerVault NX1950 Guida di riferimento rapido

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Dell™ PowerVault™ NX1950 Systems

End-to-End Deployment Guide for iSCSI

Model EMU01

Notes, Notices, and Cautions

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

your computer.

NOTICE: A NOTICE indicates either potential damage to hardware or loss of data

and tells you how to avoid the problem.

CAUTION: A CAUTION indicates a potential for property damage, personal injury,

or death.

____________________

Information in this document is subject to change without notice.

Reproduction in any manner whatsoever without the written permission of Dell Inc. is strictly forbidden.

Trademarks used in this text: Dell, the DELL logo, PowerEdge, PowerVault, and OpenManage are

trademarks of Dell Inc.; Intel is a registered trademark of Intel Corporation; 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.

Model EMU01

February 2008 Rev. A02

Contents 3

Contents

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

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

PowerVault NX1950 Storage Solution Vs.

PowerVault NX1950 Cluster Solution . . . . . . . . . 8

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

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

Active/Passive Vs. Active/Active iSCSI . . . . . . . 9

Before Setting Up the PowerVault NX1950

Storage Solution as an iSCSI Software Target . . . . . . 9

Best Practices for Setting Up the iSCSI Storage

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

2 Quick Install Steps for Initiator-Target

Connection . . . . . . . . . . . . . . . . . . . . . . . 17

Method 1 (Discovery Using Target Portals) . . . . . . . 17

Pre-Requisites . . . . . . . . . . . . . . . . . . . 17

Configuring the Initiator (Host) . . . . . . . . . . . 18

Configuring iSCSI Connection With the

PowerVault NX1950 Storage Solution . . . . . . . 19

Creating a Virtual Disk . . . . . . . . . . . . . . . 20

Configuring iSCSI Connection With the

PowerVault NX1950 Cluster Solution . . . . . . . . 21

Configuring the Initiator-Target Connection

From Initiator (Host) . . . . . . . . . . . . . . . . 23

4Contents

Method 2 (Discovery Using iSNS Server) . . . . . . . . 24

Pre-Requisites . . . . . . . . . . . . . . . . . . . 25

Configuring Settings From the Initiator

Server/Client . . . . . . . . . . . . . . . . . . . . 25

Setting Up the Target (PowerVault NX1950

Storage Solution and PowerVault NX1950

Cluster Solution) . . . . . . . . . . . . . . . . . . 25

3 Detailed End-to-End iSCSI Setup . . . . . 27

Setting Up Target IP Addresses in the PowerVault

NX1950 Storage Solution. . . . . . . . . . . . . . . . . 27

Setting up Target IP Addresses in the PowerVault

NX1950 Cluster Solution . . . . . . . . . . . . . . . . . 27

Using the 3.0 iSCSI Target . . . . . . . . . . . . . 27

Using the 3.1 iSCSI Target . . . . . . . . . . . . . 27

Configuring iSCSI Devices. . . . . . . . . . . . . . . . 28

Installing Microsoft iSCSI Initiator . . . . . . . . . 28

Configuring the Microsoft iSCSI Initiator . . . . . . 30

Configuring Microsoft iSCSI Software

Target . . . . . . . . . . . . . . . . . . . . . . . . 30

Establishing Connections . . . . . . . . . . . . . . . . 41

Pre-Requisites . . . . . . . . . . . . . . . . . . . 41

Configuring iSCSI LUNs. . . . . . . . . . . . . . . 43

Multiple Sessions . . . . . . . . . . . . . . . . . . 44

iSCSI Snapshots . . . . . . . . . . . . . . . . . . 44

Disconnecting/Cleaning Up iSCSI Devices . . . . . . . 49

From Initiator . . . . . . . . . . . . . . . . . . . . 49

From Target . . . . . . . . . . . . . . . . . . . . . 50

Contents 5

4 Configuring Secured iSCSI Connections

Using Challenge-Handshake

Authentication Protocol . . . . . . . . . . . . . 51

CHAP vs IPSec . . . . . . . . . . . . . . . . . . . . . . 52

One-Way CHAP Authentication . . . . . . . . . . . . . 52

iSCSI Target settings . . . . . . . . . . . . . . . . 52

iSCSI Initiator Settings . . . . . . . . . . . . . . . 53

Mutual CHAP Authentication . . . . . . . . . . . . . . 53

Initiator Settings . . . . . . . . . . . . . . . . . . 53

Target Settings . . . . . . . . . . . . . . . . . . . 54

Initiator Settings Continued . . . . . . . . . . . . 54

A Appendix . . . . . . . . . . . . . . . . . . . . . . . . . 55

Initiator Details . . . . . . . . . . . . . . . . . . . . . 55

General Tab . . . . . . . . . . . . . . . . . . . . . 55

Discovery Tab. . . . . . . . . . . . . . . . . . . . 56

Targets Tab . . . . . . . . . . . . . . . . . . . . . 58

Advanced Configuration Details . . . . . . . . . . . . 61

Enabling Multi-Path on the Initiator . . . . . . . . 61

Using the Advanced Option . . . . . . . . . . . . 62

Verifying the Properties of the Targets

That are Connected. . . . . . . . . . . . . . . . . 62

Load Balance Policy . . . . . . . . . . . . . . . . 63

Installing and Configuring iSNS server . . . . . . . . . 64

Configuring the iSNS Server . . . . . . . . . . . . 65

6Contents

Best Practices for Efficient Storage Management . . . 67

Storage Manager for SANs. . . . . . . . . . . . . 67

LUN Management for iSCSI Subsystems . . . . . . 67

Related Links . . . . . . . . . . . . . . . . . . . . . . . 68

Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

Introduction 7

Introduction

This document provides information about configuring the

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

Dell™ PowerVault™ NX1950 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.

iSCSI storage solutions and technology have a place in many IT environments.

The performance of iSCSI storage solutions is adequate for many applications

and iSCSI technology provides the benefits of storage area network technology

for a lower cost than Fibre Channel storage solutions.

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 NX1950 Storage Solution Vs. PowerVault NX1950 Cluster

Solution

Throughout this document, the term PowerVault NX1950 storage system

refers to the individual storage unit. The term PowerVault NX1950 storage

solution refers to the configuration of the storage unit along with the storage

arrays. The term PowerVault NX1950 cluster solution refers to the

configuration of more than one storage units and 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 55.

Introduction 9

Active/Passive Vs. Active/Active iSCSI

In a PowerVault NX1950 cluster solution that is configured with a 3.0 iSCSI

Target, only one node that owns the Cluster Resources can create and own

the iSCSI Targets. The iSCSI Target service is operative in only one node at a

time (Active/Passive configuration).

In a PowerVault NX1950 cluster solution that is configured with 3.1 iSCSI

Target, you can create iSCSI highly-available (HA) instances on all nodes of a

cluster and thereby facilitate Active/Active iSCSI Target access. Al nodes of

the cluster can use the iSCSI Target service at the same time.

NOTE: The 3.0 iSCSI Target software enables you to configure an Active/Passive

cluster solution. The 3.1 iSCSI Target software enables you to configure an

Active/Active cluster configuration. You can download the 3.1 iSCSI Target software

from the Dell Support website at support.dell.com.

Before Setting Up the PowerVault NX1950

Storage Solution as an iSCSI Software Target

Before you set up your PowerVault NX1950 storage solution as an iSCSI

Target, read this section completely. You must consider features like Ethernet

settings, security settings for iSCSI Targets, and specific settings for iSCSI

Targets in a PowerVault NX1950 cluster solution.

Best Practices for Setting Up the iSCSI Storage Area Network

Table 1-1 and Table 1-2 provide 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 NX1950 storage solution or

PowerVault NX1950 cluster solution.

• It is good practice to have at least four NICs in a cluster configuration and

at least three NICs in a stand-alone configuration (two NICs dedicated for

iSCSI in different subnets).

• iSCSI NIC teaming is not supported.

10 Introduction

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

based on your requirement.

NOTE: Table 1-1 and Table 1-2 provide 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 NX1950 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

3- Option 1

NOTE: Use this

configuration if iSCSI

traffic has more

priority than NFS

traffic.

NIC-1 - NIC for public Network

NIC-2 - iSCSI dedicated traffic (subnet A)

NIC-3 - iSCSI dedicated traffic (subnet B)

Figure 1-2

3- Option 2

NOTE: Use this

configuration if NFS

has more priority than

iSCSI traffic.

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

network

NIC-3 - iSCSI dedicated traffic

Figure 1-3

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