Clustering Windows 2003

Clustering Windows 2003 Consulting Services

The clustering services included with Windows Server 2003 are the result of years of real-world experience building Microsoft clusters. As a result, Windows Server 2003 clusters work in today’s real world of reduced budgets and limited manpower. Windows Server 2003 clusters save you more than they cost you, and they do more than merely provide availability—they fulfill your business continuity requirements. The latest generation of Microsoft clusters is inexpensive to deploy, yet capable of growing quickly to keep up with demand. Windows Server 2003 clustering works in your world.

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Clustering Windows 2003 Overview  

Most clustered applications, and their associated resources, are assigned to one cluster node at a time. If Server Cluster detects the failure of the primary node for a clustered application, or if that node is taken offline for maintenance, the clustered application is started on a backup cluster node. Client requests are immediately redirected to the backup cluster node to minimize the impact of the failure. Though most clustered services run on only one node at a time, a cluster can run many services simultaneously to optimize hardware utilization. Some clustered applications may run on multiple Server Cluster nodes simultaneously, including Microsoft SQL Server.

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Network Load Balancing (NLB)

A clustering technology included with Windows Server 2003 is NLB. NLB clusters don’t use a quorum, and so don’t impose storage or network requirements on the cluster nodes. If a node in the cluster fails, NLB automatically redirects incoming requests to the remaining nodes. If you take a node in the cluster offline for maintenance, you can use NLB to allow existing client sessions to be completed before taking the node offline. This eliminates any end-user impact during planned downtime. NLB is also capable of weighting requests, which allows you to mix high-powered servers with legacy servers and ensure all hardware is efficiently utilized.

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