Clustered file system on Linux

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http://serverfault.com – This is quite a general question but I need some advice on clustering apache linux servers ideally on VM. I have some apache servers that are being using that are highly used on space (i.e. each server has 250gb of data on it) at the moment these are physical servers but I've built a VMware build to get away from the physical servers. My question is what is the best way to cluster different VM servers together ideally we have a data folder in the www root which is 150gb of data these folder I would like to be clustered? I might be asking the wrong question but at the moment I'm rsyncing al (HowTos)