hellew, We usually suggest a cluster for high availability requirements...you have two servers running different apps and acting as a fallback for the other. Oracle 9i Real Application Clusters is an example of an app making use of underlying clustering functionality. You can also use clustering for load-balancing.
regds, Kishor
Problem that can be solved using a cluster are 1> Distributed Compilation of large programs e.g teambuilder/distcc 2> Image Rendering using Pov-Ray/other variants 3> Hypertext indexing / searching.
--> Vinayak Hegde
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