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Jul 08, Facebook released Cassandra to open source under the Apache license. Facebook uses Cassandra as email search system where, as of last summer, they had 25TB and over 100m mailboxes. This video gets into more detail on the architecture and design: http://www.new.facebook.com/video/video.php?v=540974400803#/video/video.php?v=540974400803. My notes are below...

Scale-up solutions in the form of large SMPs have represented the mainstream of commercial computing for the past several years. The major server vendors continue to provide increasingly larger and more powerful machines. More recently, scale-out solutions, in the form of clusters of smaller machines, have gained increased acceptance for commercial computing. Scale-out solutions are particularly effective in high-throughput web-centric applications. In this paper, we investigate the behavior of two competing approaches to parallelism, scale-up and scale-out, in an emerging search application.

IBM System z10 Enterprise Class Installation Manual for Physical Planning GC28-6865