All information and answers are located at http://en.wikipedia.org/wiki/Computer_cluster

Free Linux Clustering software
Linux-HA => http://www.linux-ha.org/
Linux Virtual Server => http://www.linuxvirtualserver.org/

Paid (not free) Red Hat cluster => http://www.redhat.com/software/rha/cluster/

If u need any specific help please reply back.

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Rocky Jr.
You may have my body & soul, but you will never touch my pride!

If you have knowledge, let others light their candles at it.

Certified to work on HP-UX / Sun Solaris / RedHat