Dell PowerVault NX1950 Leitfaden
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Dell™ PowerVault™ NX1950
Cluster Systems With
Dell|EqualLogic PS Series Storage Array
Installation and Troubleshooting Guide
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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.
© 2008 Dell Inc. All rights reserved.
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
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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.
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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
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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.
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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.
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