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== Starting and Stopping Xen Guest Systems ==
When a Xen guest operating system has been configured it will appear in the list of systems when the ''virt-manager'' is loaded. The ''virt-manager'' tool is launched either by selecting the Applications->System Tools->Virtual Machine Manager menu option or from the command-line by running /usr/sbin/virt-manager.
The following screenshot shows the ''virt-manager'' tool running on a Fedora system. It lists two systems - Domain 0 which is the host system, and a guest system named ''XenFed'' which is currently shut down:
[[Image:xen_hardware_settings.jpg| Xen Virtual Machine Details - Hardware]]
The hardware screen initially displays the CPU settings, allowing the number of CPUs used by the virtual machine to be modified.
The panel on the left allows the current displayed category to be changed. For example, to change the memory assigned to the guest system, select the Memory option and change the settings as required:
[[Image:xen_monitoring.jpg|Monitoring Xen Guest memory/cpu Performance]]
In addition, the ''virt-manager'' main window displays smaller CPU graph and Memory scale scales next to each guest OS together with a bar indicating the percentage of overall available memory used by each operating system:
[[Image:xen_memory_percentage.jpg|Xen VM memory percentage usage]]
The overall performance statistic of the host operating system may similarly be viewed by selecting the host OS in ''virt-manager'' (typically Domain-0) and clicking ''Edit->Machine details...''.
