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All clustering technologies aim to achieve one or more of the following:
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Obtain the maximum affordable computational power.
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Obtain faster program execution.
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Deliver unstoppable services.
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Avert points of failure.
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Exact most effective utilization of resources.
A clustered file server ideally has the following properties:
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All clients can connect transparently to any server.
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A server can fail and clients are transparently reconnected to another server.
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All servers serve out the same set of files.
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All file changes are immediately seen on all servers.
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Infinite ability to scale by adding more servers or disks.
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