Douglas Eadline writes "Don't have cluster hardware, not to worry. Using Xen and some basic
PC hardware, you can build a virtual cluster to test ideas, software, and
learn about clusters. In particular, it is a common practice to have development and test servers for each production server, so that you can experiment with changes without the fear of breaking anything important, but this is usually not feasible with clusters. So how do you try that new version of your favorite program or test ideas before committing it to the production cluster? A cheap and convenient possibility is to build a virtual cluster."
July 25, 2006