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What is the recommended density of virtual environments on a single physical server?

The density range completely depends upon the resources of the server, the contents of a particular VE, and finally the desired amount of VEs tied to a single piece of hardware. The two most critical resources that enable virtualization are the CPU and RAM. The more processing power there is available, the fewer requirements to offload processing to virtual memory. Virtuozzo for Linux can achieve a density of 100 VEs with minimal content and applications on a 1.46 GHz, 1 GB RAM and 36 GB hard drive. Virtuozzo for Windows is slightly more limited because the Windows operating system itself takes a large chunk of the available memory.

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