The Simplest Linux Cluster - OpenMosix
Anybody want to make use their own unused Pentium based PC, rather then let them occupied your store space? Go for OpenMosix Cluster, it is the simplest cluster I've run it now, don't need to modify your existing program/application as it is actually a "Process Migrator" tool to migrate process to not so busy node, and you can attach new nodes when you feel the power of your cluster is not enough. The cons of the openmosix is it won't migrate treads and shared memory application (eg, Apache, mysql), but there is already a patch to do it. :)
