# Using ServeRAID in a cluster environment

A cluster is a group of independent computer systems that work together as a single logical system. A client interacts with a cluster as though it is a single server. In other words, a cluster is a group of computers linked together in such a way that they share and manage a set of resources that can support a number of users at the same time.

The ServeRAID high-availability clustering solution is based on a two-server cluster, where both servers can access the same storage devices, but only one server at a time controls the storage devices shared by both servers. If one of the two running servers fails, the remaining server automatically assumes control of the shared resources managed by the failed server while still controlling its own resources at the same time. The failed server can then be repaired offline without the loss of time or work efficiency because the shared data and applications earlier managed by the failed server are still online to the clients.

When the failed server is operational again, it can be placed back into the cluster; the resources are reallocated between the two servers and the cluster resumes normal operation.

You will need clustering hardware and software to configure a cluster. You can install IBM ServeRAID Cluster Solution by using one of the following software applications:

- Microsoft Cluster Service, which is part of Windows NT Server Enterprise Edition
- Microsoft Cluster Service using Windows 2000, which is part of Windows 2000 Advanced Server Edition.

Important: Be sure to review Installing the IBM ServeRAID Cluster Solution (4CLUSTER.PDF).

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