windows clustering and quorum basics

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Presented by Yogesh Arora

SQL Community Session – Delhi NCR

Basics of windows Clustering & Quorum Models

1. Basics of windows Clustering2. Quorum Models

Welcome.Microsoft Services helps businesses around the world maximize their return on investment in Microsoft products and technologies.

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Basics of windows Clustering

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

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Differences between Windows 2008 and 2012 cluster

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

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Clustering Common Terms

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

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Quorum Configuration

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

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Overview of the quorum configuration options

Use typical Settings

Add or change the quorum Witness

Advanced quorum Configuration and witness

selection

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Overview of the quorum configuration options

Impact of data distribution

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Add or remove Quorum witness

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Overview of the advanced quorum configuration options

Sort

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FAQ’s 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?

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