1 Dell Compellent Storage Center How to Setup a Microsoft Windows Server 2012 Failover Cluster Reference Guide Dell Compellent Technical Solutions Group January 2013
2 THIS BEST PRACTICES GUIDE IS FOR INFORMATIONAL PURPOSES ONLY, AND MAY CONTAIN TYPOGRAPHICAL ERRORS AND TECHNICAL INACCURACIES. THE CONTENT IS PROVIDED AS IS, WITHOUT EXPRESS OR IMPLIED WARRANTIES OF ANY KIND Dell Inc. All rights reserved. Reproduction of this material in any manner whatsoever without the express written permission of Dell Inc. is strictly forbidden. For more information, contact Dell. Dell, the DELL logo, and the DELL badge are trademarks of Dell Inc. Microsoft and Windows 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 disclaims any proprietary interest in the marks and names of others. ii
3 Table of Contents 1 Preface Audience Purpose Customer Support Introduction to Windows Server 2012 Failover Clustering Overview Active/Active Clusters Active/Passive Clusters Quorum Configurations Using MPIO with Microsoft Failover Clusters Network Configuration Public Interface Private Interface NIC Teaming Setup and Configuration Prerequisites Server Configuration Installing the Failover Clustering Feature Creating a New Cluster Cluster Setup Cluster Validate Configure Cluster Quorum Adding Disks to a Cluster High Availability Creating a High Availability File Server Provision a Shared Folder for the File Server Administrative Tasks Testing Failover/Moving Roles Cluster-Aware Updating Windows PowerShell iii
4 Document Revisions Date Revision Author Comments 1/4/ Kris Piepho Initial Release iv
5 1 Preface 1.1 Audience The audience for this document is system administrators who are responsible for the setup and maintenance of Windows servers and associated storage. Readers should have a working knowledge of Windows and the Dell Compellent Storage Center. 1.2 Purpose This document provides an overview of Failover Clustering and additional guidance for the process of setting up and configuring a Failover Cluster on Windows Server 2012 when using the Dell Compellent Storage Center. 1.3 Customer Support Dell Compellent provides live support EZSTORE ( ), 24 hours a day, 7 days a week, 365 days a year. For additional support, Dell Compellent at Dell Compellent responds to s during normal business hours. January 2013 How to Setup a Microsoft Server 2012 Failover Cluster 1
6 2 Introduction to Windows Server 2012 Failover Clustering 2.1 Overview Window Server 2012 Failover Clustering provides the capability to tie multiple servers together to offer high availability and scalability for business-critical applications such as Microsoft Exchange, Hyper-V, Microsoft SQL Server, and file servers. Clustering is designed to maintain data integrity and provide failover support. Windows Server 2012 Failover Clustering can scale up 64 nodes in a single cluster. Windows Server 2012 Failover Clustering includes new and changed functionality from the prior release included in Windows Server 2008 R2. This functionality supports increased scalability, continuously available file-based server application storage, easier management, faster failover, and more flexible architectures for failover clusters. For a complete list of changes and new features included in Windows Server 2012 Failover Clustering, please refer to Microsoft TechNet. Failover Clustering is included in both the Standard and Datacenter versions of Windows Server Active/Active Clusters In active/active clusters, all nodes are active. In the event of a failover, the remaining active node takes on the additional processing operations, which causes a reduction in the overall performance of the cluster. Active/passive cluster configurations are generally recommended over active/active configurations because they often increased performance, availability, and scalability. Microsoft Exchange 2013 and SQL Server 2012 support a configuration that falls into the realm of what would be considered as an active/active cluster configuration. These particular configurations will not be discussed as they are beyond the scope of this document. For detailed information about Microsoft Exchange 2013 and SQL Server 2012 clustering, please refer to Dell Compellent Knowledge Center. 2.3 Active/Passive Clusters In active/passive clustering, the cluster includes active nodes and passive nodes. The passive nodes are only used if an active node fails. Active/Passive clusters are commonly known as failover clusters. For example, file and print environments use the active/passive cluster model since two nodes cannot own the same disk resource at one time. Windows Server 2008 Failover Clustering operates in this mode. January 2013 How to Setup a Microsoft Server 2012 Failover Cluster 2
7 2.4 Quorum Configurations The following information on quorums contains information taken from the Microsoft TechNet article entitled: Configure and Manage the Quorum in a Windows Server 2012 Failover Cluster The quorum for a cluster is determined by the number of voting elements that must be part of active cluster membership for that cluster to start properly or continue running. By default, every node in the cluster has a single quorum vote. In addition, a quorum witness (when configured) has an additional single quorum vote. You can configure one quorum witness for each cluster. A quorum witness can be a designated disk resource or a file share resource. Each element can cast one vote to determine whether the cluster can run. Whether a cluster has quorum to function properly is determined by the majority of the voting elements in the active cluster membership. To increase the high availability of the cluster, and the roles that are hosted on that cluster, it is important to set the cluster quorum configuration appropriately. The cluster quorum configuration has a direct effect on the high availability of the cluster, for the following reasons: Be aware that the full function of a cluster depends on quorum in addition to the following factors: January 2013 How to Setup a Microsoft Server 2012 Failover Cluster 3
8 For example, a cluster that has five nodes can have quorum after two nodes fail. However, each remaining node would serve clients only if it had enough capacity to support the clustered roles that failed over to it and if the role settings prioritized the most important workloads. The cluster software automatically configures the quorum for a new cluster, based on the number of nodes configured and the availability of shared storage. This is usually the most appropriate quorum configuration for that cluster. However, it is a good idea to review the quorum configuration after the cluster is created, before placing the cluster into production. To view the detailed cluster quorum configuration, you can you use the Validate a Configuration Wizard to run the Validate Quorum Configuration test. In Failover Cluster Manager, the basic quorum configuration is displayed in the summary information for the selected cluster. The following quorum types are available in Windows Server 2012 Failover Clustering: Node majority (no witness) Only nodes have votes. No quorum witness is configured. The cluster quorum is the majority of voting nodes in the active cluster membership. Node majority with witness (disk or file share) Nodes have votes. In addition, a quorum witness has a vote. The cluster quorum is the majority of voting nodes in the active cluster membership plus a witness vote. A quorum witness can be a designated disk witness or a designated file share witness. No majority (disk witness only) No nodes have votes. Only a disk witness has a vote. The cluster quorum is determined by the state of the disk witness. The cluster has quorum if one node is available and communicating with a specific disk in the cluster storage. Generally, this mode is not recommended, and it should not be selected because it creates a single point of failure for the cluster. 2.5 Using MPIO with Microsoft Failover Clusters Using MPIO with clustering is supported in both round-robin and failover-only configurations. Windows Server 2012 automatically defaults Compellent Storage Center volumes to a round-robin MPIO configuration. In Windows Server 2012, the MPIO load balance policy for each volume can be modified in Disk Management under the MPIO tab of the volume properties. A default load balance policy for MPIO can also be set, and any new volumes on the server will automatically be set to use the specified MPIO load balance policy. January 2013 How to Setup a Microsoft Server 2012 Failover Cluster 4
9 Refer to the Dell Compellent Microsoft MPIO Best Practices Guide for more information on configuring MPIO in Windows Server Network Configuration 3.1 Public Interface The public interface contains the IP address of the server as it would be accessed over the network. It should contain the specific subnet mask, default gateway, and DNS server addresses for accessing the network. Note: If possible, the public interface for cluster traffic should be on a dedicated NIC, separate from the NIC accessed for server management. A specific adapter can be selected for cluster traffic after a cluster has been set up. Figure 1: Network Connections 3.2 Private Interface The private interface is reserved for cluster communications and is commonly referred to as the heartbeat. In a two node cluster, a standard RJ-45 cable can be used to directly connect the first node to the second node. In a larger cluster configuration, a separate subnet or private network should be dedicated as a switch will have to be used for these cluster communications. Because cluster communications require minimal bandwidth, a 10 Mbps half-duplex connection is all that is required. It is common practice to use the 10.x.x.x network for the private interface. Below is an example of how to configure the TCP/IP settings of the private interface: January 2013 How to Setup a Microsoft Server 2012 Failover Cluster 5
10 Figure 2: IP Settings Figure 3: Advanced DNS Settings Figure 4: Advanced WINS Settings Referring to Figures 2 4 above, please note the following configuration settings: January 2013 How to Setup a Microsoft Server 2012 Failover Cluster 6
11 3.3 NIC Teaming By default, the create cluster process will automatically create a public and private cluster network based upon the IP address assigned to the cluster. The NIC adapters assigned to each network are automatically assigned based upon the subnet assigned to each adapter. In cases where there are two or more adapters on each node that belong to the same subnet, the cluster will only use one of the adapters on each node to allow access from the public network. In order to use more than one adapter on the same subnet in the cluster, the adapters need to be teamed prior to cluster creation. In Windows Server 2012, NICs can be teamed via software from the NIC manufacturer (such as Intel or Broadcom), or through the built-in load balancing and failover option (LBFO) within the operating system. For more information on LBFO, please refer to Microsoft TechNet. 4 Setup and Configuration 4.1 Prerequisites The following are required to successfully configure Failover Clustering: Windows Server 2012 Standard or Datacenter Edition that is a domain member Compellent Storage Center Properly zoned Fibre or iscsi connectivity Two Ethernet ports (min. one for public and one for private connectivity) One static IP address for public network connectivity 4.2 Server Configuration Identify the server that will be the first node in the new cluster. This will be referred to as Node 1 in this document. It is required that this server is a member of a domain. To form a cluster, cluster nodes must be domain member servers. January 2013 How to Setup a Microsoft Server 2012 Failover Cluster 7
12 4.3 Installing the Failover Clustering Feature This process must be followed on each node. To install Failover Clustering: Figure 5: Server Manager Figure 6: Add Roles and Features Wizard January 2013 How to Setup a Microsoft Server 2012 Failover Cluster 8
13 Figure 7: Select Installation type Figure 8: Select destination server Figure 9: Select server roles January 2013 How to Setup a Microsoft Server 2012 Failover Cluster 9
14 Figure 10: Select features Figure 11: Add Roles and Features Wizard January 2013 How to Setup a Microsoft Server 2012 Failover Cluster 10
15 10. Figure 12: Confirm installation selections Figure 13: Installation progress Figure 14: Completed installation January 2013 How to Setup a Microsoft Server 2012 Failover Cluster 11
16 5 Creating a New Cluster 5.1 Cluster Setup The Failover Cluster Management MMC is used to create failover clusters, validate hardware for potential failover clusters, and perform configuration changes to failover clusters. To create a new cluster: Figure 15: Failover Cluster Manager 3. Figure 16: Create Cluster Wizard January 2013 How to Setup a Microsoft Server 2012 Failover Cluster 12
17 Figure 17: Select Servers Figure 18: Validation Warning January 2013 How to Setup a Microsoft Server 2012 Failover Cluster 13
18 Figure 19: Validate a Configuration Wizard Figure 20: Testing Options Figure 21: Confirmation January 2013 How to Setup a Microsoft Server 2012 Failover Cluster 14
19 Figure 22: Summary Figure 23: Cluster Access Point Figure 24: Confirmation January 2013 How to Setup a Microsoft Server 2012 Failover Cluster 15
20 Note: By enabling the Add all eligible storage to the cluster checkbox, all storage that is presented to both nodes of the cluster and formatted with NTFS will be added to the cluster available storage pool. Figure 25: Summary 5.2 Cluster Validate Historically, cluster configurations (Windows 2000 and Windows 2003) had to be certified through the Windows Hardware Quality Lab (WHQL) in order to be approved and eligible for support by Microsoft. Starting with Windows Server 2008, the Cluster Validate tool has been included with the Operating System to test the functionality and compatibility of the servers and storage involved in a cluster. This tool verifies that the storage meets the requirements (supports specific commands) to operate in a failover cluster. The end-user can run Cluster Validate and save the output as proof of supportability for the configuration. It is Dell Compellent s best practices recommendation that Cluster Validate be performed on any cluster configuration that uses Dell Compellent Storage Center to ensure the customer can receive Microsoft Premier Support should a cluster issue arise. Cluster Validate is a wizard-driven tool in Failover Cluster Manager that can be run as part of configuring a new cluster or at any time thereafter. The Cluster Validate tool assumes that the storage is attached and accessible by all nodes participating in the test. 5.3 Configure Cluster Quorum By default, in a configuration where two nodes exist, the default quorum configuration is Node Majority. Depending upon the quorum configuration, a quorum volume will have to be created and mapped to the cluster nodes. If the chosen a quorum configuration requires a disk witness, start by creating a 1GB volume on the Compellent Storage Center and mapping it to all nodes of the cluster. Once this is complete, rescan the disks on Node 1 January 2013 How to Setup a Microsoft Server 2012 Failover Cluster 16
21 using Disk Management. Initialize the LUN, create the partition and format with NTFS. Standard practice is to assign the drive letter Q: to the quorum volume. Figure 26: Disk Manager This example demonstrates how to change the cluster quorum configuration to Node and Disk Majority. To change quorum type, or modify quorum configuration settings: Figure 27: Configure Cluster Quorum Settings January 2013 How to Setup a Microsoft Server 2012 Failover Cluster 17
22 Figure 28: Configure Cluster Quorum Wizard Figure 29: Select Quorum Configuration Option Figure 30: Select Quorum Witness January 2013 How to Setup a Microsoft Server 2012 Failover Cluster 18
23 Figure 31: Configure Storage Witness Figure 32: Confirmation Figure 33: Summary January 2013 How to Setup a Microsoft Server 2012 Failover Cluster 19
24 6 Adding Disks to a Cluster Adding disks to the cluster is a simple process once the new volume has been created on the Dell Compellent Storage Center and then mapped to each node of the cluster. Complete the following steps from either node to add a new disk (or disks) to the cluster: Figure 34: Disk Manager Figure 35: New disk detected January 2013 How to Setup a Microsoft Server 2012 Failover Cluster 20
25 Figure 36: Bring disk online Figure 37: Not initialized Figure 38: Initialize disk Figure 39: Disk online January 2013 How to Setup a Microsoft Server 2012 Failover Cluster 21
26 Figure 40: New Simple volume Figure 41: New Simple Volume Wizard Figure 42: Specify Volume Size January 2013 How to Setup a Microsoft Server 2012 Failover Cluster 22
27 Figure 43: Assign Drive Letter Figure 44: Format Partition Figure 45: Completing the New Simple Volume Wizard January 2013 How to Setup a Microsoft Server 2012 Failover Cluster 23
28 Figure 46: Available disk Figure 47: Failover Cluster Manager Figure 48: Add Disk to Cluster January 2013 How to Setup a Microsoft Server 2012 Failover Cluster 24
29 6. Figure 49: Available Cluster Disks 7 High Availability In previous versions of Windows clustering, cluster groups contained the resource necessary to manage failover and determined how failover was handled. In Windows Server 2008/R2 failover clustering, cluster groups were referred to as Services and Applications. In Windows Server 2012, highly available services and applications are referred to as Roles. Examples of a highly available cluster role might be a file server, WINS, or a virtual machine. It should be noted that in order to add a role to the cluster, that role or feature must already be installed on each node of the cluster. For example, in order to add the File Server role to the cluster, the File Server role must be installed from the Add Roles and Features Wizard on each node of the cluster. Note: Windows Server 2012 includes many enhancements for clustering Hyper-V and virtual machines. For detailed information on how to install, configure and administer Windows Server 2012 Hyper-V clustering, please refer to the Dell Compellent Storage Center Best Practices for Hyper-V Guide on Knowledge Center. 7.1 Creating a High Availability File Server In this example, we ll use a disk that has been added to the cluster to create a highly available file server. 1. January 2013 How to Setup a Microsoft Server 2012 Failover Cluster 25
30 Figure 50: Configure Role 2. Figure 51: High Availability Wizard 3. Select File Server from the list of available roles. Click Next. Figure 52: Select Role January 2013 How to Setup a Microsoft Server 2012 Failover Cluster 26
31 4. Select File Server for general use. Click Next. Figure 53: File Server Type 5. Enter a name that clients will use to access the file server. Enter a unique IP address for the file server. Click Next. Figure 54: Client Access Point 6. Select an available storage volume to assign to the file server cluster. Click Next. Figure 55: Select Storage January 2013 How to Setup a Microsoft Server 2012 Failover Cluster 27
32 7. Confirm settings and click Next. Figure 56: Confirm Settings 8. Click Finish on the Summary screen. Figure 57: Summary 9. Once the file server role configuration has completed, the server, network access point and assigned storage will be visible in Failover Cluster Manager. Figure 58: Roles Window January 2013 How to Setup a Microsoft Server 2012 Failover Cluster 28
33 7.2 Provision a Shared Folder for the File Server Provisioning of shared folders on the cluster volumes that are contained in the file server cluster is required to provide failover of these resources in the event of a node or service failure. Follow these steps to provision a shared (SMB) folder in the file server cluster: 1. In Failover Cluster Manager, expand the cluster, click on Roles, right-click on the file server, and choose Add File Share. Figure 59: Context Menu 2. The New Share Wizard appears. Select SMB Share Advanced, and click Next. Note: By choosing the Advanced option, enhanced configuration settings such as data classification and quota management are available through the new share wizard. Also note that in order to select the Advanced option, the File Server Resource Manager Role must be installed on both nodes of the cluster. Figure 60: New Share Wizard January 2013 How to Setup a Microsoft Server 2012 Failover Cluster 29
34 3. Select the server and path for the share. Select Next when complete. Figure 61: Select server path 4. Enter a Share name and click Next. Figure 62: Specify share name 5. Configure Share settings. Click Next to continue. Figure 63: Configure share settings January 2013 How to Setup a Microsoft Server 2012 Failover Cluster 30
35 6. Specify share permissions for SMB-based access to the folder. Click Next. Figure 64: Specify permissions 7. (Optional) select the type of data that will be stored on the share. Enter an address to be notified when denied users request access to the folder. Click Next. Figure 65: Folder management properties 8. If desired, apply a quota to the share. Click Next to continue. Figure 66: Apply quota January 2013 How to Setup a Microsoft Server 2012 Failover Cluster 31
36 9. Confirm selections and click Create to add the share to the clustered file server. Figure 67: Confirm selections 10. View share creation results. Click Close to exit. Figure 68: View results 11. The new share is visible in the Shares Tab in the Roles window of File Server Manager. Figure 69: Rules window January 2013 How to Setup a Microsoft Server 2012 Failover Cluster 32
37 8 Administrative Tasks 8.1 Testing Failover/Moving Roles Short of pulling the power on one of your nodes to test the failover capabilities, you can use Failover Cluster Manager to move the Role from one node to another. To move a configured Role to another node: 1. From Failover Cluster Manager, expand the cluster, and highlight Roles. In the Roles window, right-click the Role to failover and then choose Move, then Select Node. Figure 70: Move context menu 2. Select the node to move the Role to, and click OK. Figure 71: Move Clustered Role 3. The Role will move to the other node. Verify the owner node in the Roles window: January 2013 How to Setup a Microsoft Server 2012 Failover Cluster 33
38 Figure 72: Verify owner node 8.2 Cluster-Aware Updating New to Windows Server 2012, Cluster-Aware Update (CAU) is an automated feature that allows you to update clustered servers with little or no loss in availability during the update process. During an Updating Run, CAU transparently performs the following tasks: CAU is a powerful feature that can be scheduled on regular, daily, weekly, or monthly intervals. 8.3 Windows PowerShell As with previous versions of Windows Server, Windows Server 2012 includes Failover Cluster Cmdlets to allow for the installation, configuration and administration of failover clustering from within PowerShell. For a complete listing of all available Failover Clustering Cmdlets, please refer to Microsoft TechNet. January 2013 How to Setup a Microsoft Server 2012 Failover Cluster 34
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