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The global zone is the first zone to boot and requires hardware access. From the global zone, non-global zones are created and booted. Boot time for non-global zones is very fast, often a few seconds. The CPU, network, and memory resources for each zone can be controlled from the global zone, ensuring fair access to system resources. As with other forms of virtualization, each zone is isolated from the other zones – zones cannot see processes or resources used in other zones. The low marginal cost of a zone allows large systems have tens or even hundreds of zones without significant overhead. The theoretical limit to the number of zones on a single platform is 8,192.

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