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Outside Kernel - Works completely outside the kernel and on top of a machines existing operating system. Installation does not require modification of the kernel - similar to other software packages.
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Within Kernel - Other cluster environments use:
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- Micro-based kernels with customised services. - Dynamic kernel module.
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Installed instead or as a module within the existing kernel to supportthe desired environment. Necessary to support functionality, such asvirtual shared memory.
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Difficult to achieve efficiently outside the kernel.
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