This article looks like it came out just one month ago or not even http://blog.cloudera.com/blog/2013/08/how-to-select-the-right-hardware-for-your-new-hadoop-cluster/
And recommends 12-24 1-4TB disks in a JBOD configuration. I know hadoop is used a lot in analytics but can also be used in some similar use cases as cassandra can because the performance tests out and about between the two are quite similar. (but maybe this recommendation is for analytic type use cases only?) I was wondering what some on the cassandra list might think about that….it is interesting that they also recommend 64G of RAM as well. Thanks, Dean