How do i prevent a xen dom-u from being used?
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Xen has two commands subcommands pause & unpause. In the pause state the resources (cpu & mem) are still being used, but xen cannot schedule the dom-u against another cpupool for instance.
# xl pause webserver01
To unpause
# xl unpause webserver01
You can check the status during the pause and unpause. Notice the state change.
# xl list
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