"Clustering" has become one of the biggest buzz words since SQL Server 2000 and Windows 2000 were introduced due...
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to the improved manageability and reliability. Clustering in SQL Server 2000 is when two or more servers are configured to operate as a single virtual SQL Server to support database transactions. Each node or server in the cluster has the needed files installed locally as well as via a shared disk subsystem to support the SQL Server databases. A heart beat is used between the nodes to ensure each node is functioning properly, if not a failover occurs. Clustering is used to achieve high availability with SQL Server to support 24x7 operations to prevent a hardware failure from stopping an application from servicing client needs.
In a nutshell, with Windows 2000 Advanced Server and Windows 2003, two to 32 nodes can support a cluster to meet business needs. The two primary clustering modes for a two node cluster are:
- ActiveActive – Both nodes in the cluster process database transactions typically at 50% of the total resources because either node can fail-over to the other so that a single node would be responsible for the transactions of both nodes.
- ActivePassive – One node in the cluster processes database transactions and the second node processes database transactions only if the first node fails.
For additional information about clustering visit:
- SQL Server 2000 failover clustering
- Chapter 12 - Failover clustering
- An Introduction to SQL Server clustering
- SQL Server clustering and log shipping articles
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