Dell POWERVAULT MD3620I User Manual

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Dell PowerVault MD3600i and

MD3620i Storage Arrays

Deployment Guide

Page 2

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.

___________________

Trademarks used in this text: Dell™, the DELL logo, PowerEdge™, PowerVault™, andOpenManage™ are trademarks of Dell Inc. Intel® is a registered trademarks of Intel Corporation inthe U.S. and other countries. Microsoft®, Windows®, Windows Server®, MS-DOS®, and InternetExplorer® are either trademarks or registered trademarks of Microsoft Corporation in the United Statesand/or other countries. Red Hat® and Red Hat Enterprise Linux® are registered trademarks of Red Hat, Inc. in the United States and other countries. SUSE® is a registered trademark of Novell, Inc. in the United States and other countries.

2013 - 07 Rev. A02

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Contents

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

System Requirements . . . . . . . . . . . . . . . . . . . 7

Management Station Requirements

. . . . . . . . . 7

Introduction to Storage Arrays

. . . . . . . . . . . . . . 8

2 Hardware Installation . . . . . . . . . . . . . . . 11

Planning the Storage Configuration. . . . . . . . . . . 11

Connecting the Storage Array

Cabling the Storage Array

Redundant and Non-Redundant Configurations

Direct-Attached Configurations

Network-Attached Configurations . . . . . . . . . 20

Cabling PowerVault MD1200 Series Expansion Enclosures

. . . . . . . . . . . . . . . . . . . . . . . . 25

Expanding With Previously Configured PowerVault MD1200 Series Expansion Enclosures

Expanding With New PowerVault MD1200

Series Expansion Enclosures. . . . . . . . . . . . 27

. . . . . . . . . . . . . . . . . . . . . 25

. . . . . . . . . . . . . . 12

. . . . . . . . . . . . . . . . 12

. . 12

. . . . . . . . . . 13

3 Installing PowerVault MD

Storage Software

Graphical Installation (Recommended) . . . . . . 32

. . . . . . . . . . . . . . . . . . 31

Contents 3

Page 4

Console Installation . . . . . . . . . . . . . . . . . 34

Silent Installation . . . . . . . . . . . . . . . . . . 34

Upgrading MD Storage Software . . . . . . . . . . . . 35

4 Post Installation Tasks. . . . . . . . . . . . . . 37

Before You Begin. . . . . . . . . . . . . . . . . . . . . 37

iSCSI Configuration Worksheet

IPv4 Settings—Worksheet

IPv6 Settings—Worksheet

Configuring iSCSI on Your Storage Array

. . . . . . . . . . . . . 38

. . . . . . . . . . . . . 39

. . . . . . . . . . . . . 40

. . . . . . . . 42

Automatic Configuration Using the Modular Disk Configuration Utility

Post Connection Establishment Steps

. . . . . . . . . . . . . . 43

. . . . . . . . . . 46

Guidelines For Configuring Your Network For iSCSI

Microsoft Windows Host Setup

. . . . . . . . . . . . . . . . . . . . . . . . . 47

. . . . . . . . . . . . . 47

Using A DHCP server

Using static IP addressing

Using A DNS server

Using A WINS Server

. . . . . . . . . . . . . . . . 47

. . . . . . . . . . . . . 47

. . . . . . . . . . . . . . . . . 48

. . . . . . . . . . . . . . . . 48

Linux Host Setup . . . . . . . . . . . . . . . . . . . . . 49

Using DHCP

. . . . . . . . . . . . . . . . . . . . . 49

Using A Static IP Address . . . . . . . . . . . . . 49

4 Contents

Page 5

5 Uninstalling MD Storage Software . . . . . 51

Uninstalling MD Storage Software From Windows . . 51

Uninstalling MD Storage Software From Linux

. . . . . 52

6 Getting Help. . . . . . . . . . . . . . . . . . . . . . . 53

Locating Your System Service Tag . . . . . . . . . . . 53

Contacting Dell

Documentation Feedback

. . . . . . . . . . . . . . . . . . . . . 53

. . . . . . . . . . . . . . . . 54

A Appendix—Manual Configuration

of iSCSI . . . . . . . . . . . . . . . . . . . . . . . . . . 55

Step 1: Discover the Storage Array

(Out-of-band Management Only) . . . . . . . . . . . . 56

Default Management IPv4 Port Settings

Automatic Storage Array Discovery . . . . . . . . 57

Manual Storage Array Discovery

Setting Up the Array

. . . . . . . . . . . . . . . . 58

Step 2: Configure the iSCSI Ports on the Storage Array

. . . . . . . . . . . . . . . . . . . . 59

. . . . . . 56

. . . . . . . . . 58

Step 3: Perform Target Discovery From the iSCSI Initiator

Step 4: Configure Host Access

. . . . . . . . . . . . . . . . . . . . 61

. . . . . . . . . . . . . 63

Understanding CHAP Authentication

What is CHAP?

Target CHAP

Mutual CHAP

. . . . . . . . . . . . . . . . . . . 64

. . . . . . . . . . . . . . . . . . . . 64

. . . . . . . . . . 64

Contents 5

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CHAP Definitions . . . . . . . . . . . . . . . . . . 65

Step 5: Configure CHAP Authentication on the Storage Array (Optional)

. . . . . . . . . . . . . . . . . 65

Configuring Target CHAP Authentication on the Storage Array

. . . . . . . . . . . . . . . . . . 65

Configuring Mutual CHAP Authentication on the Storage Array

. . . . . . . . . . . . . . . . . . 66

Step 6: Configure CHAP Authentication on the Host Server (Optional)

. . . . . . . . . . . . . . . . . . 67

Step 7: Connect to the Target Storage Array From the Host Server

. . . . . . . . . . . . . . . . . . . 71

Step 8: (Optional) Set Up In-Band Management

. . . . . 74

B Appendix—Using Internet Storage

Naming Service . . . . . . . . . . . . . . . . . . . . 77

C Appendix—Load Balancing . . . . . . . . . . 79

Load Balance Policy . . . . . . . . . . . . . . . . . . . 79

Round Robin With Subset

. . . . . . . . . . . . . . 79

Least Queue Depth With Subset . . . . . . . . . . 80

Least Path Weight With Subset

. . . . . . . . . . . 80

Changing Load Balance Policies on the

Windows Server 2008 Operating System . . . . . . 80

Increasing Bandwidth With Multiple iSCSI Sessions

. . . . . . . . . . . . . . . . . . . 81

D Appendix—Stopping iSCSI Services

in Linux . . . . . . . . . . . . . . . . . . . . . . . . . . 85

6 Contents

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Introduction

This guide provides information about deploying Dell PowerVault MD3600i and Dell PowerVault MD3620i storage arrays. The deployment process includes:

• Hardware installation

• Modular Disk Storage Manager (MDSM) software installation

• Initial system configuration

Other information provided include system requirements, storage array organization, and utilities.

NOTE: For more information on product documentation, see

dell.com/support/manuals.

MDSM enables an administrator to configure and monitor storage arrays for optimum usability. The version of MDSM included on the PowerVault MD series resource media can be used to manage both the PowerVault MD3600i series and the earlier PowerVault MD series storage arrays. MDSM is compatible with both Microsoft Windows and Linux operating systems.

System Requirements

Before installing and configuring the PowerVault MD3600i series hardware and software, ensure that the minimum system requirements are met, and the supported operating system is installed. For more information, see the Dell PowerVault Support Matrix available on dell.com/support/manuals.

Management Station Requirements

A management station uses MDSM to configure and manage storage arrays across the network, and must meet the following minimum system requirements:

• Intel Pentium or an equivalent processor (333 MHz or faster) with 512 MB RAM (1024 MB recommended).

• 1 GB disk space.

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• Display resolution of 1024x768 with 16 million colors (1280x1024 32-bit recommended).

• Microsoft Windows, Red Hat Enterprise Linux, or SUSE Linux Enterprise Server.

NOTE: Supported operating systems include both native and guest operating

systems.

NOTE: Supported hypervisors include Microsoft Hyper-V, Citrix XenServer,

and VMware. For information about the supported versions, see the

Matrix

at dell.com/support.

• Administrator or equivalent permissions.

Support

Introduction to Storage Arrays

A storage array includes various hardware components, such as physical disks, RAID controller modules, fans, and power supplies, gathered into enclosures. An enclosure containing physical disks accessed through RAID controller modules is called a storage array.

One or more host servers attached to the storage array can access the data on the storage array. You can also establish multiple physical paths between the host(s) and the storage array so that loss of any single path (for example, through failure of a host server port) does not result in loss of access to data on the storage array.

The storage array is managed by MDSM running on a:

• Host server—On a host server system, MDSM and the storage array communicate management requests and event information using SAS connections.

• Management station—On a management station, MDSM communicates with the storage array either through an Ethernet connection to the storage array management port or through an Ethernet connection to a host server. The Ethernet connection passes management information between the management station and the storage array using SAS connections.

Using MDSM, you can configure the physical disks in the storage array into logical components called disk groups and then divide the disk groups into virtual disks. Disk groups are created in the unconfigured capacity of a storage array. Virtual disks are created in the free capacity of a disk group.

8 Introduction

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Unconfigured capacity comprises physical disks not already assigned to a disk group. When a virtual disk is created using unconfigured capacity, a disk group is automatically created. If the only virtual disk in a disk group is deleted, the disk group is also deleted. Free capacity is space in a disk group that is not assigned to any virtual disk.

Data is written to the physical disks in the storage array using RAID technology. RAID levels define the way in which data is written to physical disks. Different RAID levels offer different levels of accessibility, redundancy, and capacity. You can set a specified RAID level for each disk group and virtual disk on your storage array.

For more information about using RAID and managing data in your storage solution, see the

Owner’s Manual at

dell.com/support/manuals

Introduction 9

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10 Introduction

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Hardware Installation

Before using this guide, ensure that you review the instructions in the:

•

Getting Started Guide

storage array provides information to configure the initial setup of the system.

• Planning section of the information your storage solution. See the

dell.com/support/manuals

about important concepts you must know before setting up

Planning the Storage Configuration

Consider the following before installing your storage array:

• Evaluate data storage needs and administrative requirements.

• Calculate availability requirements.

• Decide the frequency and level of backups, such as weekly full backups with daily partial backups.

• Consider storage array options, such as password protection and e-mail alert notifications for error conditions.

• Design the configuration of virtual disks and disk groups according to a data organization plan. For example, use one virtual disk for inventory, a second for financial and tax information, and a third for customer information.

• Decide whether to allow space for hot spares, which automatically replace failed physical disks.

—The

Getting Started Guide

Owner’s Manual—

Owner’s Manual

that shipped with the

The planning section provides

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Connecting the Storage Array

The storage array is connected to a host using two hot-swappable RAID controller modules. The RAID controller modules are identified as RAID controller module 0 and RAID controller module 1.

Each RAID controller module has two iSCSI In port connectors that provide Ethernet connections to the host server or switches. Each RAID controller module also contains an Ethernet management port and a SAS Out port. The Ethernet management port allows you to install a dedicated management station (server or stand-alone system). The SAS Out port allows you to connect the storage array to optional PowerVault MD1200 series expansion enclosures for additional storage capacity.

Each PowerVault MD3600i series storage array can be expanded to a maximum of 120 (or 192, if enabled using Premium Feature activation) physical disks through a maximum of seven MD1200 series expansion enclosures.

Cabling the Storage Array

The iSCSI interface enables different host-to-controller configurations. The figures in this chapter are grouped according to the following categories:

• Direct-attached configurations (no Ethernet switches are used)

• Network-attached (SAN) configurations (Ethernet switches are used)

Redundant and Non-Redundant Configurations

Non-redundant configurations are configurations that provide only a single data path from a host to the storage array. This type of configuration is only recommended for non-critical data storage. Path failure from a failed or removed cable, a failed NIC, or a failed or removed RAID controller module results in loss of host access to storage on the storage array.

Redundancy is established by installing separate data paths between the host and the storage array, in which each path is to one of the two RAID controller modules installed in the storage array. Redundancy protects the host from losing access to data in the event of path failure, because both RAID controller modules can access all the disks in the storage array.

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Direct-Attached Configurations

You can connect the Ethernet ports of the host servers directly to the storage array RAID controller module iSCSI ports.

Single Path Data Configurations

With a single path configuration, a group of heterogeneous hosts can be connected to the storage array through a single physical Ethernet port. Since there is only one port, there is no redundancy, although each iSCSI portal supports multiple connections. This configuration is supported for both single controller and dual controller modes.

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Figure 2-1 shows a non-redundant cabling configuration to the RAID

Corporate, public, or private network

Storage array

Server 1 Server 2

controller modules using a single path data configuration.

Figure 2-1. Two Hosts Connected to a Single Controller

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Figure 2-2 shows one host connected to a single controller array.

Corporate, public, or private network

Storage array

Server

Figure 2-2. One Host Connected to a Single Controller

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Figure 2-3 shows four stand-alone hosts supported in a dual controller array

Corporate, public, or private network

Storage array

Server 2

Server 3 Server 4Server 1

configuration with a single data path.

Figure 2-3. Four Hosts in a Dual-Controller Configuration

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Dual Path Data Configuration

In Figure 2-4, up to two servers are directly attached to the RAID controller modules. If the host server has a second Ethernet connection to the array, it can be attached to the iSCSI ports on the array's second controller. This configuration provides improved availability by allowing two separate physical paths for each host, which ensures full redundancy if one of the paths fail.

In Figure 2-5, up to two cluster nodes are directly attached to two RAID controller modules. Since each cluster node has redundant paths, loss of a single path still allows access to the storage array through the alternate path.

Hardware Installation 17

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Figure 2-4. Two Hosts Connected to Two Controllers

Storage array

Server 1

Server 2

Corporate, public, or private network

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Figure 2-5. Two Hosts Connected in a Dual-Controller Configuration

Corporate, public, or private network

Storage array

Two node cluster server

Hardware Installation 19

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Network-Attached Configurations

You can also cable the host servers to the RAID controller module iSCSI ports through industry-standard 10G or 1G Ethernet switches. An iSCSI configuration that uses Ethernet switches is frequently referred to as an IP SAN. By using an IP SAN, the PowerVault MD3600i series storage array can support up to 64 hosts simultaneously. This configuration supports either single or dual path data configurations and either single or dual controller modules.

Figure 2-6 shows up to 64 stand-alone servers attached (using multiple sessions) to a single RAID controller module through a network. Hosts that have a second Ethernet connection to the network allow two separate physical paths for each host, which ensures full redundancy if one of the paths fails. It is recommended you use two switches for more redundancy. However, single switch configuration is also supported. Figure 2-7 shows how the same number of hosts can be similarly attached to a dual RAID controller module configuration.

Figure 2-8 shows up to 64 stand-alone servers attached (using multiple sessions) to a single RAID controller module through a network using a 1G to 10G aggregation scheme. The NICs on the servers are 1G NICs and the uplink ports on the 1G switches are 10G. Hosts that have a second Ethernet connection to the network allow two separate physical paths for each host, which ensures full redundancy if one of the paths fails. It is recommended you use two switches for more redundancy. However, single switch configuration is also supported.

Figure 2-9 shows how the same number of hosts can be similarly attached to a dual RAID controller module configuration. Hardware redundancy is achieved in this configuration, in case of any switch failure.

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Corporate, public, or private network

Up to 64 hosts

Switch

Storage array

Figure 2-6. 64 Servers Connected to a Single Controller

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Figure 2-7. 64 Servers Connected to Two Controllers

Corporate, public, or private network

Storage array

Up to 64 hosts

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Figure 2-8. 64 Servers Connected to a Single RAID Controller

Up to 64 hosts

Storage array

1G NICs

1G Switches

10G Switch

10G Uplinks

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Figure 2-9. 64 Servers Connected to Two RAID Controllers

Up to 64 hosts

1G NICs

1G Switches

10G Uplinks

10G Switches

Storage array

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Cabling PowerVault MD1200 Series Expansion Enclosures

You can expand the capacity of your PowerVault MD3600i series storage array by adding PowerVault MD1200 series expansion enclosures. You can expand the physical disk pool to a maximum of 120 (or 192, if enabled using Premium Feature activation) physical disks using a maximum of seven expansion enclosures.

Expanding With Previously Configured PowerVault MD1200 Series Expansion Enclosures

Use this procedure if your expansion enclosure is directly attached to and configured on a Dell PowerEdge RAID Controller (PERC) H800 adapter. Data from virtual disks created on a PERC H800 adapter cannot be directly migrated to a PowerVault MD3600i series storage array or to a PowerVault MD1200 series expansion enclosure connected to a PowerVault MD3600i series storage array.

CAUTION: If a PowerVault MD1200 series expansion enclosure that was

previously attached to PERC H800 adapter is used as an expansion enclosure to a PowerVault MD3600i series storage array, the physical disks of the expansion enclosure are reinitialized and data is lost. You must backup all data on the expansion enclosure before attempting the expansion.

To attach previously configured PowerVault MD1200 series expansion enclosures to the PowerVault MD3600i series storage array:

Back up all data on the expansion enclosure(s).

Upgrade the expansion enclosure firmware to the latest version available at

dell.com/support

H800 controller.

Windows systems users can reference the kernel users can reference the

while the enclosure is still attached to the PERC

DUP.bin

DUP.exe

package.

package and Linux

Ensure that the storage array software is installed and up to date before adding the expansion enclosure(s).

For more information, see the

dell.com/support/manuals

Support Matrix

Hardware Installation 25

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Install the software and driver package included on the PowerVault MD series resource media.

For information about installing the software, see "Installing PowerVault MD Storage Software" on page 31.

Update the storage array RAID controller module firmware and NVSRAM to the latest versions available at MDSM

Click

Enterprise Management Window

Stop all I/O and turn off the system and attached units.

Stop all I/O to the storage array and turn off the host systems attached

Tools Upgrade RAID Controller Module Firmware

(EMW).

dell.com/support,

using

in the

to the storage array.

Turn off the storage array.

Turn off the expansion enclosure(s) in the affected system.

Cable the expansion enclosure(s) to the storage array.

Turn on attached units:

Turn on the expansion enclosure(s). Wait for the enclosure status LED to light blue.

Turn on the storage array and wait for the status LED to indicate that the unit is ready:

• If the status LEDs are solid amber, the storage array is still coming online.

• If the status LEDs are blinking amber, there is an error that can be viewed using the MDSM.

• If the status LEDs are solid blue, the storage array is ready.

After the storage array is online and ready, turn on any attached host systems.

After the PowerVault MD1200 series expansion enclosure is configured as an expansion enclosure of the storage array, restore the data that was backed up in step 1.

After the expansion enclosures are online, they can be accessed as a part of the storage array.

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Expanding With New PowerVault MD1200 Series Expansion Enclosures

Perform the following steps to attach new PowerVault MD1200 series expansion enclosures to a PowerVault MD3600i series storage array:

Perform the following steps to attach new PowerVault MD1200 series expansion enclosures to a PowerVault MD3200 series storage array:

Before adding the expansion enclosure(s), ensure that the storage array software is installed and is up to date. For more information, see the

Support Matrix

Install the software and driver package included on the PowerVault MD series

For information about installing the software, see "Installing PowerVault MD Storage Software" on page 31.

Set up the PowerVault MD1200 series expansion enclosure(s).

For information about setting up the PowerVault MD1200 series expansion enclosure(s), see the

dell.com/support/manuals

Using MDSM, update the RAID controller module firmware and NVSRAM to the latest versions available on

Click Enterprise Management Window (EMW).

Stop I/O and turn off all systems:

Stop all I/O to the storage array and turn off affected host systems attached to the storage array.

Turn off the storage array.

Turn off any expansion enclosure(s) in the affected system.

Cable the expansion enclosure(s) to the storage array.

Turn on attached units:

Turn on the expansion enclosure(s). Wait for the enclosure status LED to light blue.

Turn on the storage array and wait for the status LED to indicate that the unit is ready:

dell.com/support/manuals

resource media.

Owner’s Manual

dell.com/support

Tools Upgrade RAID Controller Module Firmware

from the

Hardware Installation 27

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• If the status LEDs are solid amber, the storage array is still coming online.

• If the status LEDs are blinking amber, there is an error that can be viewed using MDSM.

• If the status LEDs are solid blue, the storage array is ready.

After the storage array is online and ready, turn on any attached host systems.

Using MDSM, update all attached expansion enclosure firmware if it is out of date:

From the EMW, select the enclosure that you want to update and

enter the

Click

Select

Array Management Window

AdvancedMaintanence

Select All

to update all the attached expansion enclosures

(AMW).

DownloadEMM Firmware

simultaneously.

28 Hardware Installation

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Hardware Installation 29

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Installing PowerVault MD Storage Software

The Dell PowerVault MD series resource media contains software and drivers for both Linux and Microsoft Windows operating systems.

The root of the media contains a readme.txt file covering changes to the software, updates, fixes, patches, and other important data applicable to both Linux and Windows operating systems. The readme.txt file also specifies requirements for accessing documentation, information regarding versions of the software on the media, and system requirements for running the software.

For more information on supported hardware and software for Dell PowerVault systems, see the Support Matrix at dell.com/support/manuals.

NOTE: It is recommended that you install all the latest updates available at

dell.com/support.

The PowerVault MD series resource media provides features that include the core software, providers, and optional utilities. The core software feature includes the host-based storage agent, multipath driver, and Modular Disk Storage Manager (MDSM) application used to configure, manage, and monitor the storage array solution. The providers feature includes providers for the Microsoft Virtual Disk Service (VDS) and Microsoft Volume Shadow-Copy Service (VSS) framework. The Modular Disk Configuration Utility (MDCU) is an optional utility that provides a consolidated approach for configuring the management ports, iSCSI host ports, and creating sessions for the iSCSI Modular Disk storage arrays. It is recommended that you install and use the MDCU to configure iSCSI on each host connected to the storage array.

NOTE: For more information about the Microsoft VDS and Microsoft VSS providers,

see the PowerVault MD3600i Owner's Manual. To install the software on a Windows or Linux system, you must have administrative or root privileges.

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NOTE: If Dynamic Host Configuration Protocol (DHCP) is not used, initial configuration

of the management station must be performed on the same physical subnet as the storage array. Additionally, during initial configuration, at least one network adapter must be configured on the same IP subnet as the storage array’s default management port (192.168.128.101 or 192.168.128.102). After initial configuration, the management ports are configured using MDSM and the management station’s IP address can be changed back to the previous settings.

The PowerVault MD series resource media offers the following three installation methods:

• Graphical Installation (Recommended)—This is the recommended installation procedure for most users. The installer presents a graphical wizard-driven interface that allows customization of which components are installed.

• Console Installation—This installation procedure is useful for Linux users that do not desire to install an X-Window environment on their supported Linux platform.

• Silent Installation—This installation procedure is useful for users that prefer to create scripted installations.

Graphical Installation (Recommended)

The PowerVault MD Storage Manager software configures, manages and monitors the storage array. The MD Configuration Utility (MDCU) is an optional utility that provides a consolidated approach for configuring the management and iSCSI host ports, and creating sessions for the iSCSI modular disk storage arrays. It is recommended that you use MDCU to configure iSCSI on each host server connected to the storage array. To install the MD storage software:

Insert the PowerVault MD series resource media.

Depending on your operating system, the installer may launch automatically. If the installer does not launch automatically, navigate to the root directory of the installation media (or downloaded installer image) and run the navigate to the root of the resource media and run the autorun file.

md_launcher.exe

file. For Linux-based systems,

NOTE: By default, Red Hat Enterprise Linux mounts the resource media with the

–noexec mount option which does not allow you to run executable files. To change this setting, see the Readme file in the root directory of the installation media.

32 Installing PowerVault MD Storage Software

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Select

Install MD Storage Software.

Read and accept the license agreement.

Select one of the following installation options from the

Install Set

dropdown menu:

• Full (recommended)—Installs the MD Storage Manager (client) software, host-based storage agent, multipath driver, and hardware providers.

• Host Only—Installs the host-based storage agent and multipath drivers.

• Management—Installs the management software and hardware providers.

• Custom—Allows you to select specific components.

Select the PowerVault MD storage array model(s) you are setting up to serve as data storage for this host server.

Choose whether to start the event monitor service automatically when the host server reboots or manually.

NOTE: This option is applicable only to Windows client software installation.

Confirm the installation location and choose

If prompted, reboot the host server after the installation completes.

When the reboot is complete, the MDCU may launch automatically. If

Install

the MDCU does not launch automatically, launch it manually.

• In a Windows-based operating system, click

Disk Configuration Utility

• In a Linux-based operating system, double-click the

Configuration Utility

Start

MD Storage Manager

If applicable, activate any premium features purchased with your storage

icon on the desktop.

and discover the array(s).

StartDellodular

Modular Disk

array. If you purchased premium features, see the printed activation card shipped with your storage array.

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NOTE: The MD Storage Manager installer automatically installs the required

drivers, firmware, and operating system patches/hotfixes to operate your storage array. These drivers and firmware are also available at dell.com/support. In addition, see the settings and/or software required for your specific storage array.

Support Matrix

at dell.com/support/manuals for any additional

Console Installation

NOTE: Console installation only applies to Linux systems that are not running a

graphical environment.

The autorun script in the root of the resource media detects when there is no graphical environment running and automatically starts the installer in a text-based mode. This mode provides the same options as graphical installation with the exception of the MDCU specific options. The MDCU requires a graphical environment to operate.

NOTE: The console mode installer provides the option to install the MDCU.

However, a graphical environment is required to utilize the MDCU.

Silent Installation

To run silent installation on a Windows system:

1 Copy the custom_silent.properties file in the /windows folder of the

installation media or image to a writable location on the host server.

2 Modify the custom_silent.properties file to reflect the features, models

and installation options to be used. Then, save the file.

3 Once the custom_silent.properties file is revised to reflect your specific

installation, run the following command to begin the silent installation:

mdss_install.exe –f <host_server_path>\ custom_silent.properties

To run silent installation on a Linux system:

NOTE: On Red Hat Enterprise Linux 6 operating systems, run the following

script from the root directory to install prerequisite packages:

# md_prereq_install.sh

1 Copy the custom_silent.properties file in the /windows folder of the

installation media or image to a writable location on the host server.

34 Installing PowerVault MD Storage Software

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2 Modify the custom_silent.properties file to reflect the features, models

and installation options to be used. Then, save the file.

3 Once the custom_silent.properties file is revised, run the following

command to begin the installation:

./mdss_install.bin –f <host_server_path>/custom_silent.properties

Upgrading MD Storage Software

To upgrade from a previous version of the MD Storage Manager application, uninstall the previous version (see "Uninstalling MD Storage Software" on page 51), and then follow the instructions in this chapter to install the new version.

Installing PowerVault MD Storage Software 35

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36 Installing PowerVault MD Storage Software

Page 37

Post Installation Tasks

Before using the storage array for the first time, complete the initial configuration tasks in the order shown. These tasks are performed using the MD Storage Manager.

NOTE: If Dynamic Host Configuration Protocol (DHCP) is not used, initial configuration

using the management station must be performed on the same physical subnet as the storage array. Additionally, during initial configuration, at least one network adapter must be configured on the same IP subnet as the storage array’s default management port (192.168.128.101 or 192.168.128.102). After initial configuration, the management ports are configured using MD Storage Manager and the management station’s IP address can be changed back to the previous settings.

Before You Begin

NOTE: Before you begin configuring iSCSI, it is recommended that you fill out the

IPv4 or IPv6 iSCSI configuration worksheet available in this document, see "IPv4 Settings—Worksheet" on page 39 and "IPv6 Settings—Worksheet" on page 40. Gathering this type of information about your network before starting the configuration steps helps you to complete the process more efficiently.

iSCSI Configuration Terminology

Table 4-1. Standard Terminology Used in iSCSI Configuration

Term Definition

CHAP (Challenge Handshake Authentication Protocol)

Host or host server A server connected to the storage array using

Host server port SCSI port on the host server used to connect

An optional security protocol used to control access to an iSCSI storage system by restricting use of the iSCSI data ports on both the host server and storage array. For more information on the types of CHAP authentication supported, see "Understanding CHAP Authentication" on page 64.

iSCSI ports.

it to the storage array.

Post Installation Tasks 37

Page 38

Table 4-1. Standard Terminology Used in iSCSI Configuration

Term Definition

iSCSI initiator The iSCSI-specific software installed on the

host server that controls communications between the host server and the storage array.

iSCSI host port The iSCSI port (two per controller) on the

storage array.

iSNS (Microsoft Internet Storage Naming Service)

Management station The system from which you manage your

Storage array The enclosure containing the storage data

Target An iSCSI port on the storage array that

An automated discovery, management and configuration Storage Naming Service) tool used by some iSCSI devices.

host server/storage array configuration.

accessed by the host server.

accepts and responds to requests from the iSCSI initiator installed on the host server.

iSCSI Configuration Worksheet

The "IPv4 Settings—Worksheet" on page 39 and "IPv6 Settings—Worksheet" on page 40 helps you plan your configuration. Recording host server and storage array IP addresses at a single location enables you to configure your setup faster and more efficiently.

"Guidelines For Configuring Your Network For iSCSI" on page 47 provides general network setup guidelines for both Microsoft Windows and Linux environments. It is recommended that you review these guidelines before completing the worksheet.

38 Post Installation Tasks

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IPv4 Settings—Worksheet

Mutual CHAP Secret

Target CHAP Secret

host server

PowerVault MD36

192.168.131.101 (In 1 default)

192.168.128.101 (management network port)

192.168.130.102 (In 0 default)

192.168.131.102 (In 1 default)

192.168.128.102 (management network port)

If you need additional space for more than one host server, use an additional sheet.

iSCSI port 1

iSCSI port 2

Management port

Static IP address (host server)

Subnet

Default gateway

(should be different for each NIC)

___ . ___ . ___ . ___

Static IP address (host server)

Subnet

Default gateway

iSCSI controller 0, In 0

iSCSI controller 0, In 1

Management port cntrl 0

iSCSI controller 1, In 0

iSCSI controller 1, In 1

Management port cntrl 1

___ . ___ . ___ . ___

192.168.130.101 (In 0 default)

Post Installation Tasks 39

Page 40

IPv6 Settings—Worksheet

Mutual CHAP

Target CHAP

If you need additional space for more than one host server, use an additional sheet.

Link local IP address

Routable IP address

Subnet prefix

Gateway

Host server

Host iSCSI port 1

___ . ___ . ___ . ___

Link local IP address

Routable IP address

Subnet prefix

Gateway

Host iSCSI port 2

___ . ___ . ___ . ___

iSCSI controller 0, In 0

IP address

Routable IP address 1

Routable IP address 2

Router IP address

iSCSI controller 0, In 1

IP address

Routable IP address 1

Routable IP address 2

Router IP address

FE80 : 0000 : 0000 : 0000 : ____ : ____ : ____ : ____

____ : ____ : ____ : ____ : ____ : ____ : ____ : ____

FE80 : 0000 : 0000 : 0000 : ____ : ____ : ____ : ____

____ : ____ : ____ : ____ : ____ : ____ : ____ : ____

PowerVault MD36

40 Post Installation Tasks

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iSCSI controller 1, In 0

IP address

Routable IP address 1

Routable IP address 2

Router IP address

FE80 : 0000 : 0000 : 0000 : ____ : ____ : ____ : ____

____ : ____ : ____ : ____ : ____ : ____ : ____ : ____

iSCSI controller 1, In 1

IP address

Routable IP address 1

Routable IP address 2

Router IP address

FE80 : 0000 : 0000 : 0000 : ____ : ____ : ____ : ____

____ : ____ : ____ : ____ : ____ : ____ : ____ : ____

Post Installation Tasks 41

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Configuring iSCSI on Your Storage Array

The following sections contain step-by-step instructions for configuring iSCSI on your storage array. However, before you begin, it is important to understand where each of these steps occur in relation to your host server or storage array environment.

The following table shows each iSCSI configuration step and where it occurs.

Table 4-2. Host Server Vs. Storage Array

This Step is Performed on the Host Server Using the Microsoft or Linux iSCSI Initiator

Perform target discovery from the iSCSI initiator

(Optional) Configure CHAP authentication on the host server

Connect to the storage array from the host server

This Step is Performed on the Storage Array Using PowerVault MD Storage Manager

Discover the storage array

Configure the iSCSI ports on the storage array

Configure host access

(Optional) Configure CHAP authentication on the storage array

(Optional) Set up in-band management

NOTE: It is recommended that you use the PowerVault Modular Disk Configuration

Utility (MDCU) for iSCSI configuration. The PowerVault MDCU wizards guides you through the configuration steps described above. If you want to perform a manual configuration, see "Appendix—Manual Configuration of iSCSI" on page 55.

42 Post Installation Tasks

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Automatic Configuration Using the Modular Disk Configuration Utility

NOTE: If MDCU is not installed, it can be installed from the MD series resource

media.

The MDCU provides a consolidated approach for configuring the iSCSI network of host servers and iSCSI-based storage arrays using a wizard-driven interface. This utility also enables the user to configure the iSCSI sessions of the host server according to the best practices and to achieve load-balanced paths with the storage array iSCSI host ports. If you select Launch the MDCU after reboot during the installation of the host software, the utility automatically launches after the next host server reboot. This utility can also be launched manually.

The utility has a context sensitive online help to guide you through each step of the wizard.

The MDCU performs:

• Storage array configuration

• Host configuration

Storage Array Configuration

Before a host iSCSI initiator and an iSCSI-based storage array can communicate, they must be configured with information such as which IP addresses and authentication method to use. Since iSCSI initiators establish connections with an already configured storage array, the first task is to configure your storage arrays to make them available for iSCSI initiators.

This utility requires network access to the management ports of the storage arrays you wish to configure. You must have a properly functioning network infrastructure before attempting to configure your storage arrays. If your storage arrays are already configured, you can skip directly to the host configuration.

This configuration task generally involves the following steps:

Discover available storage array(s) for configuration.

Select a storage array to configure.

Set a storage array name and password.

Configure the IP protocols and addresses for the management ports.

Configure the IP protocols and addresses for the iSCSI ports.

Specify the CHAP authentication method.

Post Installation Tasks 43

Page 44

Apply the settings after reviewing a summary.

Repeat the process starting from step 2 to configure additional arrays.

Host Configuration (Host Connectivity Configuration)

After you have completed configuring your iSCSI-based storage arrays, the next task is to run this utility on all hosts that need to access the storage arrays. Depending on your network configuration, your host may be the same machine you use to manage your storage arrays, or it may be on a completely separate network.

The option to configure a host is disabled if the machine on which the utility is running does not have an iSCSI initiator or the required driver components installed. When the option is disabled, the utility also displays an informational message. If you are running the utility on a host which is not connected to the iSCSI–based storage array (or which you do not wish to connect to the array), the informational message can be ignored.

The task generally involves the following steps:

Discover available storage array(s) for connection.

Select a storage array.

Specify the CHAP secret.

Select the iSCSI ports the host's initiator uses to log on.

Repeat the process starting from step 2 to connect to additional arrays.

Repeat these steps on each host that needs access to the storage array(s).

Before Starting the Configuration Process

Before you start configuring the storage array or host connectivity, it is recommended that you fill out the iSCSI configuration worksheet to help you plan your configuration. You may need to use several worksheets depending on your configuration.

Keep the following guidelines in mind for the storage array and host configuration:

• For optimal performance, ensure your network configuration.See the storage array's

Support Matrix

at dell.com/support/manuals.

• If your host has multiple network interfaces, it is recommended that each network interface uses a separate subnet.

44 Post Installation Tasks

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• For redundancy in a dual controller (duplex) configuration, ensure each host network interface is configured to connect to both storage array controllers.

• For optimal load balancing, ensure each host network interface that is used for iSCSI traffic is configured to connect to each storage array controller.

• It is recommended that each host network interface only establishes one iSCSI session per storage array controller.

NOTE: The utility tries to follow the guidelines for the host connectivity whenever

possible based on the available host network interfaces and their connectivity with the iSCSI host ports of the storage array.

Configure the Storage Array Using MDCU

To configure the iSCSI-based storage array(s) using the MDCU:

Launch the utility (if it is not launched automatically) from the server with access to the management ports of the storage array(s) to be configured.

For Wi nd ow s , c li ck

Software



Modular Disk Configuration Utility

StartAll ProgramsDellMD Storage

For Linux, click the MDCU icon on the desktop or navigate to the

/opt/dell/mdstoragesoftware/mdconfigurationutility

terminal window and run

PowerVault MDCU

directory in a

The MDCU automatically discovers all the available storage arrays.

In the Discover MD Arrays window, select the iSCSI storage array you want to configure.

In the Selected Array window, review current port and session information.

Click Config Wizard, to start the iSCSI configuration wizard.

Complete the steps in Config Wizard to configure your iSCSI storage array.

In the Array Configuration Summary window, review and apply your configuration settings.

Click Create iSCSI Sessions, to create host-to-storage array communication.

Repeat for all host-to-array mappings you want to implement

Post Installation Tasks 45

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Verify that communication is established between the storage array and host server.

NOTE: For more information on MDCU, see the MDCU online help.

Post Connection Establishment Steps

After iSCSI connectivity is established between the host server(s) and the storage array, you can create virtual disks on the storage array using MD Storage Manager and these virtual disks can be utilized by the host server(s). For more information about storage planning and using MD Storage Manager, see the Administrator's Guide at dell.com/support/manuals.

46 Post Installation Tasks

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Guidelines For Configuring Your Network For iSCSI

This section provides general guidelines for setting up your network environment and IP addresses for use with the iSCSI ports on your host server and storage array. In order for hosts to communicate with management and/or iSCSI ports of storage arrays, local NICs must be configured with IP addresses capable of communication with the addresses listed in the IPv4/IPv6 worksheet. Your specific network environment may require different or additional steps than shown here, so make sure you consult with your system administrator before performing this setup.

Microsoft Windows Host Setup

To set up a Windows host network, you must configure the IP address and netmask of each iSCSI port connected to the storage array. The specific steps depend on whether you are using a Dynamic Host Configuration Protocol (DHCP) server, static IP addressing, Domain Name System (DNS) server, or Windows Internet Name Service (WINS) server.

NOTE: The server IP addresses must be configured for network communication to

the same IP subnet as the storage array management and iSCSI ports.

Using A DHCP server

In the

Control Panel

Sharing Center

Right-click the network connection you want to configure and select

Properties

On the (for all other connections), select click

Select

General

Properties

Obtain an IP address automatically

, select

Network connections

and then click

tab (for a local area connection) or the

Manage network connections

Internet Protocol (TCP/IP)

, then click OK.

Network and

Networking

, and then

tab

Using static IP addressing

In the

Control Panel

Center

and then click

, select

Network connections

Manage network connections

Post Installation Tasks 47

Network and Sharing

Page 48

Right-click the network connection you want to configure and select

Properties

On the (for all other connections), select click

Select and default gateway addresses.

General

Properties

Use the following IP address

tab (for a local area connection) or the

Networking

Internet Protocol (TCP/IP)

and enter the IP address, subnet mask,

, and then

Using A DNS server

In the

Control Panel

Center

and then click

Right-click the network connection you want to configure and select

Properties

On the (for all other connections), select click

Select and alternate DNS server IP addresses and click

General

Properties

Obtain DNS server address automatically

, select

Network connections

Manage network connections

tab (for a local area connection) or the

Internet Protocol (TCP/IP)

Network and Sharing

or enter the preferred

Networking

, and then

Using A WINS Server

NOTE: If you are using a DHCP server to allocate WINS server IP addresses, you

do not need to add WINS server addresses.

In the

Control Panel

Right-click the network connection you want to configure and select

Properties

On the (for all other connections), select click

Select

In the server and click

To enable use of the Lmhosts file to resolve remote NetBIOS names, select

Enable LMHOSTS lookup

General

Properties

Advanced

TCP/IP WINS server

, select

Network connections

tab (for a local area connection) or the

Internet Protocol (TCP/IP)

WINS

Add

tab and click

window, type the IP address of the WINS

Add

Networking

, and then

tab

48 Post Installation Tasks

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To specify the location of the file that you want to import into the Lmhosts file, select

Open

dialog box.

Enable or disable NetBIOS over TCP/IP.

If using Microsoft Windows Server 2008 Core Version, use the netsh interface command to configure the iSCSI ports on the host server.

Import LMHOSTS

and then select the file in the

Linux Host Setup

To set up a Linux host network, you must configure the IP address and netmask of each iSCSI port connected to the storage array. The specific steps depend on whether you are configuring TCP/IP using DHCP or configuring TCP/IP using a static IP address.

NOTE: The server IP addresses must be configured for network communication to

the same IP subnet as the storage array management and iSCSI ports.

Using DHCP

If you are using DHCP (root users only):

Edit the

NETWORKING=yes HOSTNAME=mymachine.mycompany.com

Edit the configuration file for the connection you want to configure, either

/etc/sysconfig/network-scripts/ifcfg-ethX

or Enterprise Linux).

/etc/sysconfig/network

/etc/sysconfig/network/ifcfg-eth-id-XX:XX:XX:XX:XX

file:

(for Red Hat Enterprise Linux)

(for SUSE

BOOTPROTO=dhcp

Also, verify that an IP address and netmask are not defined.

Restart network services using the following command:

/etc/init.d/network restart

Using A Static IP Address

If you are using a static IP address (root users only)

Edit the /

etc/sysconfig/network

file as follows:

Post Installation Tasks 49

Page 50

NETWORKING=yes HOSTNAME=mymachine.mycompany.com GATEWAY=255.255.255.0

Edit the configuration file for the connection you want to configure, either

/etc/sysconfig/network-scripts/ifcfg-ethX

or /etc/sysconfig/network/ifcfg-eth-id-XX:XX:XX:XX:XX (for SUSE Enterprise Linux).

BOOTPROTO=static BROADCAST=192.168.1.255 IPADDR=

192.168.1.100 NETMASK=255.255.255.0 NETWORK=

192.168.1.0 ONBOOT=yes TYPE=Ethernet

HWADDR=XX:XX:XX:XX:XX:XX GATEWAY=192.168.1.1

Restart network services using the following command:

/etc/init.d/network restart

(for Red Hat Enterprise Linux)

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Uninstalling MD Storage Software

Uninstalling MD Storage Software From Windows

Use the Change/Remove Program feature to uninstall the Dell PowerVault Modular Disk Storage Software (MDSS) from Microsoft Windows operating systems other than Microsoft Windows Server 2008:

From the

Select

Click

The

Follow the instructions on screen.

Select

Use the following procedure to uninstall Modular Disk Storage software from Windows Server 2008 GUI versions:

From the

Select

Click

The

Control Panel,

Dell MD36

Change/Remove

Uninstall Complete

Yes

to restart the system, and then click

Control Panel

MD Storage Software

Uninstall/Change

Uninstall Complete

double-click

xxi Storage Software

window is displayed.

, double-click

from the list of programs.

window is displayed.

Add or Remove Programs

from the list of programs.

Done

Programs and Features

Follow the instructions on screen.

Select

Yes

to restart the system, then click Done.

Use the following procedure to uninstall Modular Disk Storage Software on Windows Server 2008 Core versions:

Navigate to the

Storage Software

NOTE: By default, MD Storage Manager is installed in the \Program Files\Dell\MD

Storage Software directory. If another directory was used during installation, navigate to that directory before beginning the uninstallation procedure.

\Program Files\Dell\MD Storage Software\Uninstall Dell

directory.

Uninstalling MD Storage Software 51

Page 52

From the installation directory, type the following command and press <Enter>:

Uninstall Dell MD Storage Software

From the screen.

Select

Uninstall

Yes

to restart the system, then click

window, click

and follow the instructions on the

Done

Uninstalling MD Storage Software From Linux

By default, MD Storage Manager is installed in the

/opt/dell/mdstoragemanager

If another directory was used during installation, navigate to that directory before beginning the uninstallation procedure.

From the installation directory, open the

Software Software.exe

While the software is uninstalling, the When the uninstall procedure is complete, the

window

Click

directory and run the file

is displayed.

Done

directory.

Uninstall Dell MD Storage

Uninstall

window is displayed.

Uninstall Complete

52 Uninstalling MD Storage Software

Page 53

Getting Help

Locating Your System Service Tag

Your system is identified by a unique Express Service Code and Service Tag number. The Express Service Code and Service Tag are found on the front of the system by pulling out the information tag. This information is used by Dell to route support calls to the appropriate personnel.

Contacting Dell

NOTE: Dell provides several online and telephone-based support and service

options. If you do not have an active Internet connection, you can find contact information on your purchase invoice, packing slip, bill, or Dell product catalog. Availability varies by country and product, and some services may not be available in your area.

To contact Dell for sales, technical support, or customer-service issues:

Go to

dell.com/contactdell

Select your country or region from the interactive world map.

When you select a region, the countries for the selected regions are displayed.

Select the appropriate language under the country of your choice.

Select your business segment.

The main support page for the selected business segment is displayed.

Select the appropriate option depending on your requirement.

NOTE: If you have purchased a Dell system, you may be asked for the Service Tag.

Getting Help 53

Page 54

Documentation Feedback

If you have feedback for this document, write to

documentation_feedback@dell.com. Alternatively, you can click on the Fee dback link in any of the Dell documentation pages, fill up the form, and click Submit to send your feedback.

54 Getting Help

Page 55

Appendix—Manual Configuration of iSCSI

The following sections contain step-by-step instructions for configuring iSCSI on your storage array. However, before beginning, it is important to understand where each of these steps occur in relation to your host server or the storage array environment.

Tab le A -1 sh ow s e ac h i SCSI configuration step and where it occurs.

Table A-1. Host Server Vs. Storage Array

This Step is Performed on the Host Server Using the Microsoft or Linux iSCSI Initiator

Perform target discovery from the iSCSI initiator.

(Optional) Configure CHAP authentication on the host server.

Connect to the storage array from the host server.

This Step is Performed on the Storage Array Using MD Storage Manager

Discover the storage array.

Configure the iSCSI ports on the storage array.

Configure host access.

(Optional) Configure

Handshake Authentication Protocol (

the storage array.

(Optional) Set up in-band management.

CHAP) authentication on

Challenge

Appendix—Manual Configuration of iSCSI 55

Page 56

Step 1: Discover the Storage Array (Out-of-band Management Only)

Default Management IPv4 Port Settings

By default, the storage array management ports are set to Dynamic Host Configuration Protocol (DHCP). If the controller(s) on your storage array is unable to get IP configuration from a DHCP server, it times out after approximately three minutes and falls back to a default static IP address. The default IP configuration is:

Controller 0: IP: 192.168.128.101 Subnet Mask:

255.255.255.0

Controller 1: IP: 192.168.128.102 Subnet Mask:

255.255.255.0

NOTE: No default gateway is set.

NOTE: If DHCP is not used, perform the initial configuration using the management

station on the same physical subnet as the storage array. Additionally, during initial configuration, configure at least one network adapter on the same IP subnet as the storage array’s default management port (192.168.128.101 or 192.168.128.102). After initial configuration (management ports are configured using MD Storage Manager), you can change the management station’s IP address back to its previous settings.

Default Management IPv6 Port Settings

By default, the storage array management ports are enabled for IPv6 stateless auto-configuration. The ports are automatically configured to respond to their link local address and to a routable address if a configured IPv6 router is present on the network. To know the link local addresses of the management port, see the MAC label for the management port on the controller. For example:

If the MAC Address is 00:08:74:AA:BB:CC, the link local address starts with FE80::02.

Add the second and third bytes 08:74 MAC address to the prefix FE80::0208:744.

Add FF:FE to obtain FE80::0200:08FF:FE.

56 Appendix—Manual Configuration of iSCSI

Page 57

Finally, add the last three bytes of the MAC address FE80::0200:08FF:FEAA:BBCC.

NOTE: This procedure applies to out-of-band management only. If you choose to

set up in-band management, you must complete this step and then proceed to "Step 8: (Optional) Set Up In-Band Management" on page 74.

You can discover the storage array either automatically or manually. Select one and complete the following procedure.

Automatic Storage Array Discovery

Launch MD Storage Manager (MDSM).

If this is the first storage array to be set up, the window is displayed.

Select

Automatic

and click OK.

It may take several minutes for the discovery process to complete. Closing the discovery status window before the discovery process completes cancels the discovery process.

Appendix—Manual Configuration of iSCSI 57

Add New Storage Array

Page 58

After discovery is complete, a confirmation screen is displayed.

Click

to close the screen.

Manual Storage Array Discovery

Launch MDSM.

If this is the first storage array to be set up, the

Add New Storage Array

window is displayed.

Select

Manual

Select

Out-of-band management

and click OK.

and enter the host server name(s) or IP

address(es) of the iSCSI storage array controller.

Click

Add

Out-of-band management is now successfully configured.

After discovery is complete, a confirmation screen is displayed.

Click

to close the screen.

Setting Up the Array

When discovery is complete, the name of the first storage array found is displayed under the

The default name for the newly discovered storage array is another name is displayed, click the down arrow next to that name and select

Unnamed

Click the

Initial Setup Tasks

installation tasks. For more information about each task, see the

Manual

. Perform these tasks in the order shown in Table A-2.

Summary

tab in MDSM.

in the drop-down list.

option to see links to the remaining post-

Unnamed

. If

Owner’s

NOTE: Before configuring the storage array, check the status icons on the

Summary tab to ensure that the enclosures in the storage array are in an Optimal status. For more information on the status icons, see the dell.com/support/manuals.

Owner’s Manual

58 Appendix—Manual Configuration of iSCSI

Page 59

Table A-2. Initial Setup Tasks Dialog Box

Task Purpose

Rename the storage array To provide a more meaningful name than the

software-assigned label, Unnamed.

Set a storage array password To restrict unauthorized access. MDSM may ask

for a password before changing the configuration or performing a destructive operation.

Set up alert notifications

Set up e-mail alerts

Set up SNMP alerts

Configure a storage array To create virtual disks and map them to hosts.

To notify individuals (by e-mail) and/or storage enterprise management consoles, such as Dell Management Console, (by SNMP) when a storage array component degrades or fails, or an adverse environmental condition occurs.

Step 2: Configure the iSCSI Ports on the Storage Array

By default, the iSCSI ports on the storage array are set to the following IPv4 settings:

Controller 0, Port 0: IP: 192.168.130.101 Subnet Mask:

255.255.255.0 Port: 3260

Controller 0, Port 1: IP: 192.168.131.101 Subnet Mask:

255.255.255.0 Port: 3260

Controller 0, Port 2: IP: 192.168.132.101 Subnet Mask:

255.255.255.0 Port: 3260

Controller 0, Port 3: IP: 192.168.133.101 Subnet Mask:

255.255.255.0 Port: 3260

Controller 1, Port 0: IP: 192.168.130.102 Subnet Mask:

255.255.255.0 Port: 3260

Controller 1, Port 1: IP: 192.168.131.102 Subnet Mask:

255.255.255.0 Port: 3260

Appendix—Manual Configuration of iSCSI 59

Page 60

Controller 1, Port 2: IP: 192.168.132.102 Subnet Mask:

255.255.255.0 Port: 3260

Controller 1, Port 3: IP: 192.168.133.102 Subnet Mask:

255.255.255.0 Port: 3260

NOTE: No default gateway is set.

To configure the iSCSI ports on the storage array:

From MDSM, navigate to the

Click

configure Ethernet management ports

iSCSI Host Ports

Configure the iSCSI ports on the storage array.

NOTE: Using static IPv4 addressing is recommended, although DHCP is supported.

Setup

tab on the

and then select

AMW

Configure

The following settings are available (depending on the configuration) by clicking the

Advanced

button:

• Virtual LAN (VLAN) support—A VLAN is a network of different systems that behave as if they are connected to the same segments of a local area network (LAN) and are supported by the same switches and routers. When configured as a VLAN, a device can be moved to another location without being reconfigured. To use VLAN on your storage array, obtain the VLAN ID from your network administrator.

• Ethernet priority—This parameter is set to determine a network access priority.

• TCP listening port—The port number on the storage array that listens for iSCSI logins from host server iSCSI initiators.

NOTE: The TCP listening port for the iSNS server is the port number the

storage array controller uses to connect to an iSNS server. This allows the iSNS server to register the iSCSI target and portals of the storage array so that the host server initiators can identify them.

• Jumbo frames—Jumbo Ethernet frames are created when the maximum transmission units (MTUs) are larger than 1500 bytes per frame. This setting is adjustable port-by-port.

To enable ICMP PING responses for all ports, select

Enable ICMP PING

responses.

Click

when all iSCSI storage array port configurations are complete.

Test the connection by performing a ping command on each iSCSI storage array port.

60 Appendix—Manual Configuration of iSCSI

Page 61

Step 3: Perform Target Discovery From the iSCSI Initiator

This step identifies the iSCSI ports on the storage array to the host server. Select the set of steps in one of the following sections (Microsoft Windows or Linux) that corresponds to your operating system.

If you are using Microsoft Windows Server 2003 or Windows Server 2008 GUI version:

Click

StartProgramsMicrosoft iSCSI Initiator

Programs

Click the

Under the iSCSI port on the storage array.

If the iSCSI storage array uses a custom TCP port, change the number. The default is 3260.

Click

•



Administrative ToolsiSCSI Initiator

Discovery

Target Portals

Advanced

Local Adapter

Source IP

with.

Data Digest and Header Digest

digest of data or header information be compiled during transmission to assist in troubleshooting.

CHAP logon information

enter CHAP information at this point, unless you are adding the storage array to a Storage Area Network (SAN) that has target CHAP already configured.

tab.

, click

Add

and enter the IP address or DNS name of

and set the following values on the

—Must be set to Microsoft iSCSI Initiator.

—The source IP address of the host you want to connect

—Optionally, you can specify that a

—Leave this option unselected and do not

or click

General

StartAll

Port

tab:

NOTE: IPSec is not supported.

Click OK to exit the

Tar ge t Por ta ls

To ex it t he

If you plan to configure CHAP authentication

• more than one iSCSI port at this point. Go to "Step 4: Configure Host Access" on page 63.

Discovery

screen.

Advanced

tab, click OK.

menu and click OK again to exit the

, do not perform discovery on

Appendix—Manual Configuration of iSCSI 61

Add

Page 62

•

If you do not plan to configure CHAP authentication

, repeat step 1

thorough step 6 for all iSCSI ports on the storage array.

If you are using Windows Server 2008 Core Version:

Set the iSCSI initiator service to start automatically:

sc \\<server_name> config msiscsi start=auto

Start the iSCSI service:

Add a target portal:

sc start msiscsi

iscsicli QAddTargetPortal <IP_address_of_iSCSI_port_on_storage array>

If you are using Red Hat Enterprise Linux 5, Red Hat Enterprise Linux 6, SUSE Linux Enterprise Server 10, or SUSE Linux Enterprise Server 11:

Configuration of the iSCSI initiator for Red Hat Enterprise Linux 5 and SUSE Linux Enterprise Server 10 SP1 distributions is done by modifying the /etc/iscsi/iscsid.conf file, which is installed by default when you install MDSM. You can edit the file directly, or replace the default file with a sample file included on the PowerVault MD series resource media.

To use the sample file included on the media:

Make a copy of the default

/etc/iscsi/iscsid.conf

file by saving it to another

directory of your choice.

Edit the following entries in the

Edit or verify that the

/etc/iscsi/iscsid.conf

node.startup = manual

file:

line is disabled.

node.startup = automatic

line is

enabled. This enables automatic startup of the service at boot time.

Verify that the following time-out value is set to 30:

node.session.timeo.replacement_timeout = 30

Save and close the

From the console, restart the iSCSI service with the following command:

/etc/iscsi/iscsid.conf

file.

service iscsi start

Verify that the iSCSI service is running during boot using the following command from the console:

chkconfig iscsi on

62 Appendix—Manual Configuration of iSCSI

Page 63

To display the available iSCSI targets at the specified IP address, use the following command:

iscsiadm –m discovery –t st -p <IP_address_of_iSCSI_port>

After target discovery, use the following command to manually log in:

iscsiadm -m node –l

This login is performed automatically at startup if automatic startup is enabled.

Manually log out of the session using the following command:

iscsiadm -m node -T <initiator_username> -p <target_ip> -u

Step 4: Configure Host Access

This step specifies which host servers access virtual disks on the storage array. You should perform this step before mapping virtual disks to host servers or any time you connect new host servers to the storage array.

Launch MDSM.

Navigate to the AMW and click

Enter host name

This can be an informal name, not necessarily a name used to identify the host server to the network.

, enter the host server for virtual disk mapping.

Manually define hosts

Select a method for adding the host port identifier.

Select the host type.

Select whether or not the host server will be part of a host server group that shares access to the same virtual disks as other host servers. Select if the host is part of a Microsoft cluster.

Click

Specify if this host will be part of a host group, and click

Appendix—Manual Configuration of iSCSI 63

Finish

Yes

only

Page 64

Understanding CHAP Authentication

What is CHAP?

Challenge Handshake Authentication Protocol (CHAP) is an optional iSCSI authentication method where the storage array (target) authenticates iSCSI initiators on the host server. Two types of CHAP are supported:

•Target CHAP

•Mutual CHAP

Target CHAP

In target CHAP, the storage array authenticates all requests for access issued by the iSCSI initiator(s) on the host server using a CHAP secret. To set up target CHAP authentication, you must enter a CHAP secret on the storage array, then configure each iSCSI initiator on the host server to send that secret each time it attempts to access the storage array.

Mutual CHAP

In addition to setting up target CHAP, you can set up mutual CHAP in which both the storage array and the iSCSI initiator authenticate each other. To set up mutual CHAP, configure the iSCSI initiator with a CHAP secret that the storage array must send to the host sever in order to establish a connection. In this two-way authentication process, both the host server and the storage array send information that the other must validate before a connection is allowed.

CHAP is an optional feature and is not required to use iSCSI. However, if you do not configure CHAP authentication, any host server connected to the same IP network as the storage array can read from and write to the storage array.

NOTE: When using CHAP authentication, you should configure it on both the

storage array (using MDSM) and the host server (using the iSCSI initiator) before preparing virtual disks to receive data. If you prepare disks to receive data before you configure CHAP authentication, you lose visibility to the disks once CHAP is configured.

64 Appendix—Manual Configuration of iSCSI

Page 65

CHAP Definitions

To summarize the differences between target CHAP and mutual CHAP authentication, see Table A-3.

Table A-3. CHAP Types Defined

CHAP Type Description

Target CHAP Sets up accounts that iSCSI initiators use to connect to the

target storage array. The target storage array then authenticates the iSCSI initiator.

Mutual CHAP Applied in addition to target CHAP, mutual CHAP sets up an

account that a target storage array uses to connect to an iSCSI initiator. The iSCSI initiator then authenticates the target.

Step 5: Configure CHAP Authentication on the Storage Array (Optional)

If you are configuring CHAP authentication of any kind (either target-only or target and mutual), you must complete this step and "Step 5: Configure CHAP Authentication on the Storage Array (Optional)" on page 65.

If you are not configuring any type of CHAP, skip these steps and go to "Step 7: Connect to the Target Storage Array From the Host Server" on page 71.

NOTE: If you choose to configure mutual CHAP authentication, configure target

CHAP first.

In terms of iSCSI configuration, the term target always refers to the storage array.

Configuring Target CHAP Authentication on the Storage Array

From MDSM, click the

Authentication

Select one of the CHAP settings described in Table A-4.

To configure a CHAP secret, select

Enter the in

Confirm Target CHAP Secret

Target CHAP Secret (or Generate Random Secret)

iSCSI

tab and then click

CHAP

and click

Appendix—Manual Configuration of iSCSI 65

Change Target

and select

CHAP Secret

. Confirm it

Page 66

Although the storage array allows sizes from 12 to 57 characters, many initiators only support CHAP secret sizes up to 16 characters (128-bit).

NOTE: A CHAP secret is not retrievable after it is entered. Ensure that you

record the secret in an accessible place. If Generate Random Secret is used, copy and paste the secret into a text file for future reference since the same CHAP secret is used to authenticate any new host servers you may add to the storage array. If you forget this CHAP secret, you must disconnect all existing hosts attached to the storage array and repeat the steps in this chapter to re-add them.

Click OK.

Table A-4. CHAP Setting

Option Description

None This is the default selection. If None is the only selection, the

storage array allows an iSCSI initiator to log on without supplying any type of CHAP authentication.

None and CHAP The storage array allows an iSCSI initiator to log on with or

without CHAP authentication.

CHAP If CHAP is selected and None is deselected, the storage array

requires CHAP authentication before allowing access.

Configuring Mutual CHAP Authentication on the Storage Array

The initiator secret must be unique for each host server that connects to the storage array and must not be the same as the target CHAP secret.

Change the initiator authentication settings in the Change Target Authentication window. Use these options to change the settings:

•

None

—Select

None

, any initiator can access this target. Use this option only if you do not require secure data. However, you can select both the same time.

•

CHAP

—Select access the target to authenticate using CHAP. Define the CHAP secret only if you want to use mutual CHAP authentication. If you select and if no CHAP target secret is defined, an error message is displayed. Click

CHAP Secret

window to define the CHAP secrets.

NOTE: To remove a CHAP secret, you must delete the host initiator and re-add it.

None

if you permit no initiator authentication. If you select

None

and

CHAP

if you want to enable an initiator that tries to

to view the

Enter CHAP Secre

t windows. Use this

CHAP

66 Appendix—Manual Configuration of iSCSI

Page 67

Step 6: Configure CHAP Authentication on the Host Server (Optional)

If you configured CHAP authentication in "Step 5: Configure CHAP Authentication on the Storage Array (Optional)" on page 65, complete the following steps. If not, skip to "Step 7: Connect to the Target Storage Array From the Host Server" on page 71.

Select the set of steps in one of the following sections (Windows or Linux) that corresponds to your operating system.

If you are using Windows Server 2008 GUI version:

Click

Start

Programs

If you are not using mutual CHAP authentication, go to step 4.

If you are using mutual CHAP authentication, click the select

Secret

entered for the storage array

Click the

Under array and click

The iSCSI port you configured on the storage array during target discovery disappears.

Programs

 Administrative Tools

. At

Enter a secure secret

Discovery

Tar ge t Po rta ls

Remove

Microsoft iSCSI Initiator

tab.

, select the IP address of the iSCSI port on the storage

or click

iSCSI Initiator

, enter the mutual CHAP secret you

Start

General

All

tab and

Under

Target Portals

of the iSCSI port on the storage array (removed above).

Click

Advanced

• Local Adapter—Should always be set to Microsoft iSCSI Initiator.

• Source IP—The source IP address of the host you want to connect with.

• Data Digest and Header Digest—Optionally, you can specify that a digest of data or header information be compiled during transmission to assist in troubleshooting.

• CHAP logon information—Enter the target CHAP authentication user name and secret you entered (for the host server) on the storage array.

, click

Add

and re-enter the IP address or DNS name

and set the following values on the

Appendix—Manual Configuration of iSCSI 67

General

tab:

Page 68

• Perform mutual authentication—If mutual CHAP authentication is configured, select this option.

NOTE: IPSec is not supported.

Click OK.

If you require a discovery session failover, repeat step 5 and step 6 (in this procedure) for all iSCSI ports on the storage array. Otherwise, single-host port configuration is sufficient.

NOTE: If the connection fails, ensure that all IP addresses are entered correctly.

Mistyped IP addresses result in connection problems.

If you are using Windows Server 2008 Core version:

Set the iSCSI initiator services to start automatically (if not already set):

sc \\<server_name> config msiscsi start=auto

Start the iSCSI service (if necessary):

If you are not using mutual CHAP authentication, go to step 5.

Enter the mutual CHAP secret you entered for the storage array:

iscsicli CHAPSecret <secret>

Remove the target portal that you configured on the storage array during

sc start msiscsi.

target discovery:

iscsicli RemoveTargetPortal <IP_address> <TCP_listening_port>

Add the target portal with CHAP defined:

iscsicli QAddTargetPortal <IP_address_of_iSCSI_port_on_storage_array> [CHAP_username]

[CHAP_password]

where, [CHAP_username] is the initiator name and [CHAP_password] is the target CHAP secret.

If you require a discovery session failover, repeat step 5 for all iSCSI ports on the storage array. Otherwise, single-host port configuration is sufficient.

If you are using Red Hat Enterprise Linux 5, Red Hat Enterprise Linux 6, SUSE Linux Enterprise Server 10, or SUSE Linux Enterprise Server 11:

68 Appendix—Manual Configuration of iSCSI

Page 69

To enable CHAP (optional), the following line needs to be enabled in your

/etc/iscsi/iscsid.conf

file:

node.session.auth.authmethod = CHAP

To set a user name and password for CHAP authentication of the initiator by the target(s), edit the following lines:

node.session.auth.username = <iscsi_initiator_username>

node.session.auth.password = <CHAP_initiator_password>

If you are using Mutual CHAP authentication, you can set the user name and password for CHAP authentication of the target(s) by the initiator by editing the following lines:

node.session.auth.username_in= <iscsi_target_username>

node.session.auth.password_in = <CHAP_target_password>

To set up discovery session CHAP authentication, first uncomment the following line:

discovery.sendtargets.auth.authmethod = CHAP

Set a user name and password for a discovery session CHAP authentication of the initiator by the target(s) by editing the following lines:

discovery.sendtargets.auth.username = <iscsi_initiator_username>

discovery.sendtargets.auth.password = <CHAP_initiator_password>

To set the user name and password for discovery session CHAP authentication of the target(s) by the initiator for Mutual CHAP, edit the following lines:

discovery.sendtargets.auth.username = <iscsi_target_username>

discovery.sendtargets.auth.password_in = <CHAP_target_password>

Appendix—Manual Configuration of iSCSI 69

Page 70

The final configuration contained in the look like this:

node.session.auth.authmethod = CHAP

node.session.auth.username = iqn.2005-

03.com.redhat01.78b1b8cad821

node.session.auth.password = password_1

node.session.auth.username_in= iqn.1984-

05.com.dell:powervault.123456

node.session.auth.password_in = test1234567890

discovery.sendtargets.auth.authmethod = CHAP

discovery.sendtargets.auth.username = iqn.2005-

03.com.redhat01.78b1b8cad821

discovery.sendtargets.auth.password = password_1

discovery.sendtargets.auth.username = iqn.1984-

05.com.dell:powervault.123456

discovery.sendtargets.auth.password_in = test1234567890

If you are using SUSE Linux Enterprise Server SP3 using the GUI:

Click

DesktopYa S TiSCSI Initiator

Click

Service Start

Select

Discovered Targets

Enter the IP address of the port.

Click

Select any target that is not logged in and click

, then select

When Booting

/etc/iscsi/iscsid.conf

Discovery

file might

70 Appendix—Manual Configuration of iSCSI

Page 71

Select one:

• If you are not using CHAP authentication, select Go to step 8.

• If you are using CHAP authentication, enter the CHAP user name and password. To enable Mutual CHAP, select and enter the Mutual CHAP user name and password.

Repeat step 7 for each target until at least one connection is logged in for each controller.

Go to

Connected Targets

Verify that the targets are connected and displays a status of

No Authentication

true

Step 7: Connect to the Target Storage Array From the Host Server

If you are using Windows Server 2008 GUI:

Click

Start

Programs

Click the

If previous target discovery was successful, the iqn of the storage array should be displayed under Targets.

Programs

 Administrative Tools

Ta r ge t s

tab.

Microsoft iSCSI Initiator

iSCSI Initiator

or click

Start

All

Click

Log On

Select

Click

Advanced

tab:

•

Local Adapter

Source IP

• connect from.

•

Tar ge t Por ta l

that you want to connect to.

Automatically restore this connection when the system boots

Enable multi-path

and configure the following settings under the

—The source IP address of the host server you want to

—Select the iSCSI port on the storage array controller

—Must be set to

Appendix—Manual Configuration of iSCSI 71

Microsoft iSCSI Initiator

General

Page 72

•

Data Digest and Header Digest

—Optionally, you can specify that a digest of data or header information be compiled during transmission to assist in troubleshooting.

•

CHAP logon information

—If CHAP authentication is required,

select this option and enter the Target secret.

•

Perform mutual authentication

—If mutual CHAP authentication is

configured, select this option.

NOTE: IPSec is not supported.

Click OK.

To support storage array controller failover, the host server must be connected to at least one iSCSI port on each controller. Repeat step 3 through step 8 for each iSCSI port on the storage array that you want to establish as failover targets. The

Target Portal

address is different for each

port you connected to.

NOTE: To enable the higher throughput of multipathing I/O, the host server

must connect to both iSCSI ports on each controller, ideally from separate host-side NICs. Repeat step 3 through step 7 for each iSCSI port on each

controller. If using a duplex MD36 balanced between the controllers.

The

Status

field on the

Click OK to close the Microsoft iSCSI initiator.

NOTE: PowerVault MD36x0i supports only round-robin load-balancing

policies.

Ta r ge t s

0i configuration, then LUNs should also be

tab should now display as

Connected

If you are using Windows Server 2008 Core Version:

Set the iSCSI initiator services to start automatically (if not already set):

sc \\<server_name> config msiscsi start=auto

Start the iSCSI service (if necessary):

Log on to the target:

sc start msiscsi

iscsicli PersistentLoginTarget <Target_Name> <Report_To_PNP> <Target_Portal_Address> <TCP_Port_Number_Of_Target_Portal> * * *

<Login_Flags> * * * * * <Username> <Password> <Authtype> * <Mapping_Count>

72 Appendix—Manual Configuration of iSCSI

Page 73

where,

–

<Target_Name>

is the target name as displayed in the target list. Use

the iscsicli ListTargets command to display the target list.

–

<Report_To_PNP>

is T, which exposes the LUN to the operating

system as a storage device.

–

<Target_Portal_Address>

is the IP address of the iSCSI port on the

controller being logged in to.

–

<TCP_Port_Number_Of_Target_Portal>

–

<Login_Flags>

is 0x2 to enable multipathing for the target on the

is 3260.

initiator. This value allows more than one session to be logged in to a target at one time.

–

–

–

is the initiator name.

is the target CHAP secret.

is either 0 for no authentication, 1 for Target CHAP, or 2

for Mutual CHAP.

: NOTE:

–

<Mapping_Count>

They can be replaced with an asterisk (*) if CHAP is not used.

and

are optional parameters.

is 0, indicating that no mappings are specified

and no further parameters are required.

* * * An asterisk (*) represents the default value of a parameter.

For exa m ple, y o ur log on co mmand might look like this:

iscsicli PersistentLoginTarget iqn.1984-

05.com.dell:powervault.6001372000ffe3332xx0000046 72edf2 3260 T 192.168.130.101 * * * 0x2 * * * * *

* * * * 0

To view active sessions to the target, run the following command:

iscsicli SessionList

To support storage array controller failover, the host server must be connected to at least one iSCSI port on each controller. Repeat step 3 for each iSCSI port on the storage array that you want to establish as a failover target. The Target_ Portal_Address is different for each port you connect to.

Appendix—Manual Configuration of iSCSI 73

Page 74

PersistentLoginTarget does not initiate a login to the target until after the system is rebooted. To establish immediate login to the target, substitute LoginTarget for PersistentLoginTarget.

: NOTE: See the

information about the commands used in the previous steps. For more information about Windows Server 2008 Server Core, see the Microsoft Developers Network (MSDN) at microsoft.com.

If you are using a Linux Server:

In MDSM, the Configure iSCSI Host Ports displays the status of each iSCSI port you attempt to connect and the configuration state of all IP addresses. If either displays Disconnected or Unconfigured, respectively, check the following and repeat the iSCSI configuration steps:

• Are all cables securely attached to each port on the host server and storage array?

• Is TCP/IP correctly configured on all target host ports?

• Is CHAP set up correctly on both the host server and the storage array?

To review optimal network setup and configuration settings, see "Configuring iSCSI on Your Storage Array" on page 42.

Microsoft iSCSI Software Initiator 2.x User’s Guide

for more

Step 8: (Optional) Set Up In-Band Management

Out-of-band management (see "Step 1: Discover the Storage Array (Out-ofband Management Only)" on page 56) is the recommended method for managing the storage array. However, to optionally set up in-band management, follow the procedure given below.

The default iSCSI host port IPv4 addresses are shown below for reference:

Controller 0, Port 0: IP: 192.168.130.101 Controller 0, Port 1: IP:

192.168.131.101

Controller 0, Port 0: IP: 192.168.132.101 Controller 0, Port 1: IP:

192.168.133.101

Controller 1, Port 0: IP: 192.168.130.102 Controller 1, Port 1: IP:

192.168.131.102

Controller 1, Port 0: IP: 192.168.132.102 Controller 1, Port 1: IP:

192.168.133.102

74 Appendix—Manual Configuration of iSCSI

Page 75

NOTE: Configure the management station you are using for network

New

0i host ports.

Add New

communication to the same IP subnet as the PowerVault MD36

Establish an iSCSI session to the PowerVault MD3600i RAID storage array.

Restart the

Launch MDSM.

SMagent

service.

If this is the first storage array to be set up for management, the

Storage Array

Select

Select In-band management and enter the host server name(s) or IP

window is displayed. Otherwise, click

Manual

and click OK.

address(es) of the host server that is running the MD Storage Manager software.

Click

Add

In-band management should now be successfully configured.

Appendix—Manual Configuration of iSCSI 75

Page 76

76 Appendix—Manual Configuration of iSCSI

Page 77

Appendix—Using Internet Storage Naming Service

Internet Storage Naming Service (iSNS) server, supported only on Microsoft Windows iSCSI environments, eliminates the need to manually configure each individual storage array with a specific list of initiators and target IP addresses. Instead, iSNS automatically discovers, manages, and configures all iSCSI devices in your environment.

For more information on iSNS, including installation and configuration, see microsoft.com.

Appendix—Using Internet Storage Naming Service 77

Page 78

78 Appendix—Using Internet Storage Naming Service

Page 79

Appendix—Load Balancing

Load Balance Policy

Multi-path drivers select the I/O path to a virtual disk through a specific RAID controller module. When the multi-path driver receives a new I/O to process, the driver tries to find a path to the current RAID controller module that owns the virtual disk. If the path to the current RAID controller module that owns the virtual disk cannot be found, the multi-path driver migrates the virtual disk ownership to the secondary RAID controller module. When multiple paths to the RAID controller module that owns the virtual disk exist, you can choose a load balance policy to determine which path is used to process I/O. Multiple options for setting the load balance policies let you optimize I/O performance when mixed host interfaces are configured.

You can choose one of the following load balance policies to optimize I/O performance:

• Round robin with subset

• Least queue depth with subset

• Least path weight with subset (Microsoft Windows operating systems only)

Round Robin With Subset

The round robin with subset I/O load balance policy routes I/O requests, in rotation, to each available data path to the RAID controller module that owns the virtual disks. This policy treats all paths to the RAID controller module that owns the virtual disk equally for I/O activity. Paths to the secondary RAID controller module are ignored until ownership changes. The basic assumption for the round-robin policy is that the data paths are equal. With mixed host support, the data paths might have different bandwidths or different data transfer speeds.

Appendix—Load Balancing 79

Page 80

Least Queue Depth With Subset

The least queue depth with subset policy is also known as the least I/Os or least requests policy. This policy routes the next I/O request to a data path that has the least outstanding I/O requests queued. For this policy, an I/O request is simply a command in the queue. The type of command or the number of blocks that are associated with the command are not considered.

The least queue depth with subset policy treats large block requests and small block requests equally. The data path selected is one of the paths in the path group of the RAID controller module that owns the virtual disk.

Least Path Weight With Subset

The least path weight with subset policy assigns a weight factor to each data path to a virtual disk. An I/O request is routed to the path with the lowest weight value to the RAID controller module that owns the virtual disk. If more than one data path to the virtual disk has the same weight value, the round robin with subset path selection policy is used to route I/O requests between the paths with the same weight value. The least path weight with subset load balance policy is not supported on Linux operating systems.

Changing Load Balance Policies on the Windows Server 2008 Operating System

Load balancing with the PowerVault MD3600i series storage array is only available for Microsoft Windows Server 2008 and later versions of the operating system. You can change the load balance policies from the default round robin with subset by using either the:

•Device manager

• Disk management

To change the load balance policy using Windows Server 2008 device manager:

From the desktop of the host, right-click

Manage

Click

Right-click the multi-path disk device for which you want to set the load balance policies, then select

From the this disk device.

to open the

Device Manager

MPIO

Computer Management

tab, select the load balance policy that you want to set for

to show the list of devices attached to the host.

Properties

My Computer

dialog box.

and select

80 Appendix—Load Balancing

Page 81

To change the load balance policy using Windows Server 2008 disk management:

From the desktop of the host, right-click to open the

Click host.

Right-click the virtual disk for which you want to set the load balance policy, then click

From the this virtual disk.

Computer Management

Disk Management

Properties

MPIO

tab, select the load balance policy that you want to set for

to show the list of virtual disks attached to the

My Computer

dialog box.

and click

Manage

Increasing Bandwidth With Multiple iSCSI Sessions

The PowerVault MD3600i series storage array in a duplex configuration supports two active/active asymmetric redundant controllers. Each controller has two 10G Ethernet ports that support iSCSI. The bandwidth of the two ports on the same controller can be aggregated to provide optimal performance. A host can be configured to simultaneously use the bandwidth of both the ports on a controller to access virtual disks owned by the controller. The multi-path failover driver that Dell provides for the PowerVault MD3600i series storage array can be used to configure the storage array so that all ports are used for simultaneous I/O access. If the multi-path driver detects multiple paths to the same virtual disk through the ports on the same controller, it load-balances I/O access from the host across all ports on the controller.

Figure C-1 illustrates how the initiator can be configured to take advantage of the load balancing capabilities of the multi-path failover driver.

Appendix—Load Balancing 81

Page 82

Figure C-1. Initiator Configuration

IP Addresses

Host If1: IP_Addr_If1 If2: IP_Addr_If2

MD36

0i Controller 0 P0: IP_Addr_C0_P0 P1: IP_Addr_C0_P1 MD36

0i Controller 1 P0: IP_Addr_C1_P0 P1: IP_Addr_C1_P1

TCP Connections

To MD 3 6

0i Controller 0 T01: IP_Addr_If1 / IP_Addr_C0_P0 T02: IP_Addr_If2 / IP_Addr_C1_P1 To MD 3 6

0i Controller 1 T11: IP_Addr_If1 / IP_Addr_C1_P0 T12: IP_Addr_If2 / IP_Addr_C1_P1

iSCSI Sessions

To MD 3 6

0i Controller 0 Session 00: T01 Session 01: T02

To MD 3 6

0i Controller 1 Session 10: T11 Session 11: T12

host server

IP network 1

Storage array

IP network 2

82 Appendix—Load Balancing

Page 83

Two sessions with one TCP connection are configured from the host to each controller (one session per port), for a total of two sessions. The multi-path failover driver balances I/O access across the sessions to the ports on the same controller. In a duplex configuration, with virtual disks on each controller, creating sessions using each of the iSCSI data ports of both controllers increases bandwidth and provides load balancing.

Appendix—Load Balancing 83

Page 84

84 Appendix—Load Balancing

Page 85

Appendix—Stopping iSCSI Services in Linux

Follow the procedure given below to manually stop the iSCSI services in Linux.

To shut down iSCSI services:

Stop all I/O.

Unmount all correlated file systems. Stop iSCSI services by running the following command:

/etc/init.d/open-iscsi stop

Appendix—Stopping iSCSI Services in Linux 85

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86 Appendix—Stopping iSCSI Services in Linux

Dell POWERVAULT MD3620I User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Deployment Guide

Introduction

System Requirements

Management Station Requirements

Introduction to Storage Arrays

Hardware Installation

Planning the Storage Configuration

Connecting the Storage Array

Cabling the Storage Array

Redundant and Non-Redundant Configurations

Direct-Attached Configurations

Network-Attached Configurations

Cabling PowerVault MD1200 Series Expansion Enclosures

Expanding With Previously Configured PowerVault MD1200 Series Expansion Enclosures

Expanding With New PowerVault MD1200 Series Expansion Enclosures

Installing PowerVault MD Storage Software

Graphical Installation (Recommended)

Console Installation

Silent Installation

Upgrading MD Storage Software

Post Installation Tasks

Before You Begin

iSCSI Configuration Worksheet

Configuring iSCSI on Your Storage Array

Automatic Configuration Using the Modular Disk Configuration Utility

Post Connection Establishment Steps

Guidelines For Configuring Your Network For iSCSI

Microsoft Windows Host Setup

Using A DHCP server

Using static IP addressing

Using A DNS server

Using A WINS Server

Linux Host Setup

Using DHCP

Using A Static IP Address

Uninstalling MD Storage Software

Uninstalling MD Storage Software From Windows

Uninstalling MD Storage Software From Linux

Getting Help

Locating Your System Service Tag

Contacting Dell

Documentation Feedback

Step 1: Discover the Storage Array (Out-of-band Management Only)

Default Management IPv4 Port Settings

Automatic Storage Array Discovery

Manual Storage Array Discovery

Setting Up the Array

Step 2: Configure the iSCSI Ports on the Storage Array

Step 3: Perform Target Discovery From the iSCSI Initiator

Step 4: Configure Host Access

Understanding CHAP Authentication

What is CHAP?

Target CHAP

Mutual CHAP

CHAP Definitions

Step 5: Configure CHAP Authentication on the Storage Array (Optional)

Configuring Target CHAP Authentication on the Storage Array

Configuring Mutual CHAP Authentication on the Storage Array

Step 6: Configure CHAP Authentication on the Host Server (Optional)

Step 7: Connect to the Target Storage Array From the Host Server

Step 8: (Optional) Set Up In-Band Management

Load Balance Policy

Round Robin With Subset

Least Queue Depth With Subset

Least Path Weight With Subset

Changing Load Balance Policies on the Windows Server 2008 Operating System

Increasing Bandwidth With Multiple iSCSI Sessions