Advantages of Clusters (Score 2, Interesting)

This is much like the jail() of BSD. This does not give any of the benefits of a clustering arrangement. That is, the benefit of having a cluster is that you can distribute process across multiple machines and run from a common storage server. Although this technology is very useful (and can be applied in all sorts of ways- We run Bind in a jail) it does not provide extra process space if only running on one machine.

Having sufficient RAM is the largest factor in commodity grade webhosting services, so having mutlitple instances of a cluster on the same machine does not really make sense, when the whole point of a cluster is to give faster computation and access time.

btw- we offer both of these services here, and we do it on FreeBSD.