Windows clustering and quorum basics
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- The document discusses the basics of Windows clustering and quorum models. It defines what clustering is and why it is used for high availability of critical applications. - It covers the differences between Windows 2008 and 2012 clustering capabilities. Windows 2012 supports more nodes, built-in iSCSI, and file/storage services. - Common clustering terms are defined like active/passive, heartbeat network, shared disks, quorum, cluster resources, and groups. - Quorum configuration options are reviewed including typical settings, adding witnesses, and advanced configurations. Quorum helps ensure only one cluster remains active if communication is lost.
Windows clustering and quorum basics
- 1. © 2012 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION Presented by Yogesh Arora SQL Community Session – Delhi NCR Basics of windows Clustering & Quorum Models
- 2. 1. Basics of windows Clustering 2. Quorum Models Welcome. Microsoft Services helps businesses around the world maximize their return on investment in Microsoft products and technologies. 1/18/2016 2
- 3. Basics of windows Clustering 1/18/2016 3 The word Cluster itself is self-descriptive—a bunch or group. When two or more than two computers are connected to each other by means of a network and share some of the common resources to provide redundancy or performance improvement, they are known as a cluster of computers Clustering is usually deployed when there is a critical business application running that needs to be available 24 X 7 or in terminology—High Availability. MS Windows server Standard, Enterprise and Datacentre edition supports failover clustering SQL Server Clustering is built on top of Windows Clustering, which means before we go about installing SQL Server clustering, we should have Windows clustering installed
- 4. Differences between Windows 2008 and 2012 cluster 1/18/2016 4 Windows 2008 Windows 2012 maximum Limit 32 nodes maximum limit of 64 nodes per cluster No Cluster Aware updation No Geo Clusters No File and storage Services You need to have Star wind or SCSI interface for Shared disks Inbuilt ISCSI Interface Mo
- 5. Clustering Common Terms 1/18/2016 5 Active/Passive Cluster Active/Active Cluster Public Network: Private Network aka Heartbeat Shared Disk Array Quorum Cluster Name: Cluster IP Cluster Resource Type Cluster Account Cluster Group Cluster Name for Virtual SQL Server IP for Virtual SQL Server
- 6. Quorum Configuration 1/18/2016 6 It helps ensure that the failover cluster can start properly or continue running when the active cluster membership changes. Configuring a witness vote helps the cluster sustain one extra node down in certain configurations. Cluster quorum configuration helps ensure that only one of the subsets continues running as a cluster in case a subset cannot communicate with another subset
- 7. Overview of the quorum configuration options 1/18/2016 7 Use typical Settings Add or change the quorum Witness Advanced quorum Configuration and witness selection
- 8. Overview of the quorum configuration options 1/18/2016 8 Impact of data distribution
- 11. FAQ’s 1/18/2016 11 Question: What will happen to the data that is being accessed? Question: What about clients that were connected previously? Does the failover mean that developers will have to modify the connection string?
- 12. 1/18/2016 12