9.5. Setting up for secure and efficient I/O

A Linux image needs all three resources of a computer system: CPU, memory, and I/O. Let us present a couple of methods that can give you value in your setup. Resource sharing for Linux guests under z/VM is one of the strong points of the Linux-on-the-mainframe solution. For a guest, you can define the number of CPUs or parts of CPUs it should have, as well as how much memory it should have. In contrast to other solutions (based on individual real processors), a decision to give a guest more CPU capacity does not have to be expensive. Using the guest directory definition, administrators can change resources allocated to a guest in a matter of minutes.

Compared to over-configuring real hardware (such ...

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