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rsync is not a cluster, per se. Its a way of synchronizing servers in (near) real time. All my porn servers are synchronized with failover or load balancing across multiple servers using rsync.
Thats not the same as a cluster though. The disadvantage of clusters is expense and complexity. Also I prefer load balanced servers be at different hosting companies, something not usually possible with a cluster.
You have to ask yourself if you really want a cluster - for most web servers load balanced replicated servers are often a better and cheaper solution.
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