docs/en-US/scheduled-maintenance-maintenance-mode-hosts.xml

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<section id="scheduled-maintenance-maintenance-mode-hosts">
    <title>Scheduled Maintenance and Maintenance Mode for Hosts</title>
    <para>You can place a host into maintenance mode. When maintenance mode is activated, the host becomes unavailable to receive new guest VMs, and the guest VMs already running on the host are seamlessly migrated to another host not in maintenance mode. This migration uses live migration technology and does not interrupt the execution of the guest.</para>
    <xi:include href="vcenter-maintenance-mode.xml" xmlns:xi="http://www.w3.org/2001/XInclude" />
    <xi:include href="xenserver-maintenance-mode.xml" xmlns:xi="http://www.w3.org/2001/XInclude" />
</section>