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Here's why clustering is important in computer architecture;

Absolute scalability: It is possible to create large clusters that far surpass the power of even the largest standalone machines. 

Incremental scalability: A cluster is configured in such a way that it is possible to add new systems to the cluster in small increments. Thus, a user can start out with a modest system and expand it as needs grow, without having to go through a major upgrade in which an existing small system is replaced with a larger system. 

High availability: Because each node in a cluster is a standalone computer, the failure of one node does not mean loss of service. 

Superior price/performance: By using commodity building blocks, it is possible to put together a cluster with equal or greater computing power than a single large machine, at much lower cost.

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