"We've been well past the development/QA stage...". A lot of folks start off like that. Insufficient (or even none!) feedback keeps those virtualization solutions in the labs. It is very important that the managers pull up their socks and start reporting back to their bosses. (For the very same reason the CIOs too must take serious interest in these matters!)
All I want to say is that virtualization is running in production of companies like Google (and these guys run some real stuff there). The virtualization has been running in production for quite many years. Anyways if you're still a newcomer then an advice like this will help you decide:
Instead, you can have each app on its own virtual server, and put them all on one or more physical machines -- however many are needed to run the apps effectively. Costs are reduced since you have fewer machines to power, watch, store, and maintain. Scaling applications can be simplified since you can allocate more or fewer resources to specific vitual servers, and you can always move them onto other, more powerful physical machines as your needs grow. Plus, disaster recovery can be easier, since if you have a hardware failure, you can just load the virtual server onto a different machine and keep on truckin'.
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