Dell PowerVault NX1950 Guida

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Dell™ PowerVault™ NX1950

Cluster Systems With

Dell|EqualLogic PS Series Storage Array

Installation and Troubleshooting Guide

Book.book Page 1 Monday, February 4, 2008 1:26 PM

Notes, Notices, and Cautions

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

your computer.

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

and tells you how to avoid the problem.

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

or death.

____________________

Information in this document is subject to change without notice.

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

Trademarks used in this text: CommVault and CommVault Galaxy are registered trademarks of

CommVault Systems Inc.; Dell, the DELL logo, PowerVault, are trademarks of Dell Inc.; Microsoft,

SQL Server, Windows,Windows Server,MS-DOS are either trademarks or registered trademarks of

Microsoft Corporation in the United States and/or other countries.

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

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

trade names other than its own.

January 2008 Rev. A00

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Contents 3

Contents

1Overview. . . . . . . . . . . . . . . . . . . . . . . . . . 7

Using a PS Series SAN as Shared Storage . . . . . . . . 9

2 Planning the Network Configuration. . . . 13

Considering the Network Design Structure. . . . . . . 13

Planning Network Redundancy . . . . . . . . . . . . . 15

3 Setting Up the Cluster . . . . . . . . . . . . . . . 17

Pre-Installation Requirements . . . . . . . . . . . . . 17

Installing the Cluster. . . . . . . . . . . . . . . . . . . 17

4 Setting Up the

Dell|EqualLogic PS Series SAN . . . . . . . 21

Creating the Group. . . . . . . . . . . . . . . . . . . . 21

Configuring Volumes in a PS Series Storage Array. . . 22

Restricting Access to Volumes . . . . . . . . . . . . . 25

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4Contents

5 Configuring Shared Storage on Your

Dell|EqualLogic PS Series

Storage Array . . . . . . . . . . . . . . . . . . . . . 29

Connecting Nodes to Volumes. . . . . . . . . . . . . . 29

Aligning the Disk Sectors . . . . . . . . . . . . . . . . 32

Configuring a Basic Disk . . . . . . . . . . . . . . . . 32

Assigning a Drive Letter and

Formatting a Partition . . . . . . . . . . . . . . . . . . 32

6 Setting Up MSCS . . . . . . . . . . . . . . . . . . 33

Creating the Cluster . . . . . . . . . . . . . . . . . . . 33

Modifying the Cluster Network Configuration . . . . . 34

Adding a Node to the Cluster . . . . . . . . . . . . . . 37

Modifying Cluster Configuration Options . . . . . . . . 39

Testing Cluster Failover . . . . . . . . . . . . . . . . . 39

7 Expanding Your SAN Storage . . . . . . . . 41

Increasing the Size of a PS Series Volume . . . . . . . 41

Increasing PS Series Group Capacity . . . . . . . . . . 43

Book.book Page 4 Monday, February 4, 2008 1:26 PM

Contents 5

8 Strategies for Backup and Recovery . . . 45

Protecting Cluster Data . . . . . . . . . . . . . . . . . 45

Choosing a Backup Method . . . . . . . . . . . . . . . 46

Restoring Data . . . . . . . . . . . . . . . . . . . . . . 47

9 Upgrading your SAN and Network . . . . . 49

Upgrading Components in Your Cluster . . . . . . . . . 49

10 Maintaining Your Cluster. . . . . . . . . . . . . 51

Replacing the Quorum Resource . . . . . . . . . . . . 51

Removing a Node from a Cluster . . . . . . . . . . . . 52

A Using WSRM and Scripts to

Manage Clusters . . . . . . . . . . . . . . . . . . . 55

B Migrating an Existing Cluster to

Dell|Equallogic PS Series Storage . . . . . 57

Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

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6Contents

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Overview 7

Overview

The Dell™ PowerVault™ NX1950 cluster solution with Dell|EqualLogic

storage array combines Microsoft®Windows®Unified Data Storage Server

2003 clustering with a highly available and scalable Dell|Equallogic PS Series

storage array. Server clusters based on Microsoft®Cluster Service (MSCS)

provide availability for applications through failover. The following list

summarizes server cluster features:

• Provides features that can be used for databases, e-mail services, line of

business (LOB) applications, and custom applications.

• Includes Windows Unified Data Storage Server 2003.

• Provides high availability and server consolidation.

• Requires the use of shared storage.

NOTE: Throughout this document, PowerVault NX1950 storage system refers to the

individual storage unit and PowerVault NX1950 cluster solution refers to the

configuration of the storage unit along with the storage arrays.

In a PowerVault NX1950 cluster solution configuration, if the hardware or

software fails and causes a service failure, the cluster automatically restarts

the failed service on a functional cluster node. This service failover capability

ensures that no data is lost, and there is little disruption to users. When the

issue is corrected, the cluster can re-balance the services across all functional

nodes. The following figure illustrates a service failover on a typical cluster

configuration in which all nodes are running different services.

Figure 1-1 shows that Node A fails over to Node B.

Book.book Page 7 Monday, February 4, 2008 1:26 PM

8Overview

Figure 1-1. Node A Fails Over to Node B

NOTE: Although most clustered services run on only one node at a time, a cluster

can run many services simultaneously to optimize hardware utilization.

public network

SAN network

cluster heartbeat

PS Series array

shared storage

Book.book Page 8 Monday, February 4, 2008 1:26 PM

Overview 9

Using a PS Series SAN as Shared Storage

The PS Series storage array overcomes the challenges of DAS and traditional

SANs by providing a familiar technology for connecting servers to storage –

Ethernet. An iSCSI (Internet SCSI) SAN provides an affordable and

easy-to-manage shared storage solution for your cluster nodes. The basis of

the SAN is a PS Series storage array, a no-single-point-of-failure storage device

that combines reliability and scalability with an easy-to-use management

interface for a single system view of the storage connected to an IP network.

By grouping together one or more PS Series storage arrays, cluster nodes can

be connected to a pool of shared storage that provides:

•

High availability

— PS Series storage array hardware delivers redundant,

hot-swappable components like disks, control modules, fans, and power

supplies for a no-single-point-of-failure configuration. Components fail

over automatically without user intervention or disrupting data availability.

•

Improved data protection

— All data is protected with Redundant Arrays

of Independent Disks (RAID) and spare disks. Full component redundancy

and hot service capabilities to ensure online operation.

•

Scalability

— With a PS Series storage array, you can easily increase the

array capacity by installing additional drives or adding network connections.

You can also expand overall PS Series group capacity to terabytes of storage

by adding arrays to the group. The new arrays are configured automatically,

and the storage pool is expanded. During this process, data remains available

with no impact on hosts and applications. You do not have to open the

storage array or reconfigure an operating system. The additional storage

space is immediately available for use by any application on any server

because, in a cluster, all the servers have access to all the shared storage.

Book.book Page 9 Monday, February 4, 2008 1:26 PM

10 Overview

•

Easy and inexpensive management

— The PS Series storage array has

offers centralized storage which enables you to manage more storage

efficiently. You can use a simple setup utility to configure an array on the

network and create a PS Series group and a functioning iSCSI SAN. You

can easily manage automation of complex operations like RAID

configuration, disk sparing, data provisioning, and load balancing to ensure

effectively managing the SAN.

•

Advanced management features

— The PS Series comes standard with a

comprehensive set of features including automatic load balancing, virtual

volume management, space-efficient snapshots for instant backup and

restore, volume cloning for rapid server provisioning, multipath I/O

support, cluster support, and Auto-Replication capabilities delivering a

comprehensive disaster recovery solution.

Each array (member) in a group contributes disk space to the pool, which can

store the cluster quorum resource in addition to the data used by the cluster

applications. As needed, you allocate portions of the pool to volumes, specifying a

size, access controls, and other attributes. The PowerVault NX1950 storage

system sees each volume as a single device and each volume is automatically

load-balanced across multiple disks and group members as required.

Figure 1-2 shows a cluster configuration with a PS Series group as the shared

storage.

Book.book Page 10 Monday, February 4, 2008 1:26 PM

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